DOCSLIB.ORG

Laugalys Phd.Pdf

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

INSTITUTE OF THEORETICAL PHYSICS AND ASTRONOMY, VILNIUS UNIVERSITY Vygandas Laugalys YOUNG STARS AND INTERSTELLAR EXTINCTION IN THE NORTH AMERICA AND PELICAN NEBULAE Doctoral dissertation Physical sciences, physics (02 P), astronomy, space research, cosmic chemistry (P 520) Vilnius, 2009 Disertacija rengta 1995 - 2009 metais Vilniaus universiteto Teorin˙es fizikos ir astronomijos institute Disertacija ginama eksternu Mokslinis konsultantas prof.habil.dr. V. Straiˇzys (Vilniaus universiteto Teorin˙es fizikos ir astronomijos institutas, fiziniai mokslai, fizika – 02 P) VILNIAUS UNIVERSITETO TEORINES˙ FIZIKOS IR ASTRONOMIJOS INSTITUTAS Vygandas Laugalys JAUNOS ZVAIGˇ ZˇES˙ IR TARPZVAIGˇ ZDINˇ E˙ EKSTINKCIJA SIAURˇ ES˙ AMERIKOS IR PELIKANO DEBESYSE Daktaro disertacija Fiziniai mokslai, fizika (02 P), astronomija, erdv˙es tyrimai, kosmin˙echemija (P 520) Vilnius, 2009 Contents PUBLICATION ON THE SUBJECT OF THE DISSERTATION . 5 1. INTRODUCTION 9 1.1. Galactic structure in the investigated direction . ............. 9 1.2. The North America and Pelican Nebulae . ..... 10 1.3.YoungStars .................................... 10 1.4.TheIonizingSource(s) . ... 10 1.5.OpenClusters ................................... 11 2. OBSERVATIONAL DATA AND REDUCTIONS 12 2.1. Wide Field CCD Observations with the Maksutov telescope.......... 12 2.1.1.ObservedTargets ............................. 12 2.1.2.Reductions ................................. 13 2.1.3. The Catalogand Classification ofStars . ..... 13 2.2. CCD Observations with the Flagstaff telescope . ......... 14 2.2.1.Introduction ................................ 14 2.2.2. Advanced M 67 Flatfield Corrections . .... 14 2.2.3. Comparison With Other Photometric Data . .... 16 2.2.4.Conclusions................................. 24 2.2.5. Observed Targets and Data Reductions: NGC 6997 . ...... 30 2.2.6. Observed Targets and Data Reducions: The Dark Cloud L 935 .... 30 2.2.7. Observed Targets and Data Reducions: Collinder 428 . ........ 31 2.2.8. Classification of Stars and Their Color Excesses, Extinctions and Dis- tances ................................... 31 2.3. Zero-Age Main Sequence in the Vilnius System................. 33 2.3.1.Introduction ................................ 33 2.3.2. Photometry of the Hyades, Pleiades, Praesepe and Orion OB1 in the Vilnius System .............................. 33 2.3.3. Absolute Magnitude vs. Color Diagram . .... 34 3. DUST AND MOLECULAR CLOUDS 36 3.1. InterstellarExtinctionLaw . ...... 36 3.1.1.Introduction ................................ 36 3.1.2.Near-UVandOptical ........................... 37 3.1.3.NGC6997Area .............................. 39 3.1.4. 2MASS Data in the North America and Pelican Area and Cyg OB2 Association ................................ 42 3.2.InterstellarExtinction . ...... 50 3.2.1.Introduction ................................ 50 3.2.2. Relatively Transparent NAP Areas . .... 50 3.2.3.TheRegionofNGC6997 . .. .. 53 3.2.4.L935DarkCloudArea .......................... 55 3.2.5.TheRegionofCollinder428 . 58 3.2.6. Extinctionfrom2MASSstarcounts . ... 59 3 4. YOUNG STARS AND IONIZING SOURCES 60 4.1. Suspected Emission-Line and T Tauri Type Stars . ......... 60 4.2.IonizingSources ................................ .. 62 4.2.1.Introduction ................................ 62 4.2.2. TheComer´on&PasqualiStar . 63 4.2.3. More O-Like StarsBehind The L935Cloud . ... 63 4.2.4.TheI-Jvs.J-HDiagram . .. .. 65 4.2.5. SpectralEnergyDistributions. ..... 69 4.2.6. CommentsonIndividualStars . .. 69 4.2.7.Conclusions................................. 71 5. OBSERVED OPEN CLUSTERS 72 5.1.NGC6997 ..................................... 72 5.2.Collinder428................................... 74 6. THE MAIN RESULTS AND CONCLUSIONS 76 6.1. SUMMARY OF THE MAIN RESULTS . 76 6.2.CONCLUSIONS.................................. 77 REFERENCES 78 ACKNOWLEDGMENTS 83 APPENDIX 84 Table2.2.4........................................ 84 Table2.2.5........................................ 90 Table2.2.6........................................ 91 Table2.2.7........................................ 92 Table2.2.8........................................ 94 Table2.2.9........................................ 95 Table2.3.1........................................ 103 Table2.3.2........................................ 105 Table2.3.3........................................ 105 Table3.1.5........................................ 106 Table3.2.1........................................ 109 Table3.2.2........................................ 110 Table3.2.3........................................ 112 Table3.2.4........................................ 113 4 PUBLICATION ON THE SUBJECT OF THE DISSERTATION 1. Straiˇzys V., Corbally C. J., Laugalys V. 1999, ”Interstellar Extinction Law in the Vicinity of the North America and Pelican Nebulae”, Baltic Astronomy, 8, 355 2. Laugalys V., Straiˇzys V. 2002, ”CCD Photometry and Classification of Stars in the North America and Pelican Nebulae Region. I. Mol˙etai Photometry”, Baltic Astronomy, 11, 205 3. Laugalys V., Kazlauskas A., Boyle R. P., Vrba F.J., Philip A. G. D. Straiˇzys V. 2004, ”CCD Photometry of the M67 Cluster in the Vilnius System. II. New Photometry of High Accuracy”, Baltic Astronomy, 13, 1 4. Laugalys V., Straiˇzys V., Vrba F.J., Boyle R. P., Philip A.G.D. Kazlauskas A. 2006, ”CCD Photometry and Classification of Stars in the North America and Pelican Nebulae Region. II. The Region of NGC6997”, Baltic Astronomy, 15, 327 5. Laugalys V., Straiˇzys V., Vrba F.J., Boyle R. P., Philip A.G.D. Kazlauskas A. 2006, ”CCD Photometry and Classification of Stars in the North America and Pelican Nebulae Region. III. The Dark Cloud L935”, Baltic Astronomy, 15, 483 6. Kazlauskas A., Straiˇzys V., Bartaˇsi¯ut˙eS., Laugalys V., Cernisˇ K., Boyle R. P., Philip A.G.D. 2006, ”Zero-age Main Sequence in the HR Diagram of the Vilnius Photometric System”, Baltic Astronomy, 15, 511 7. Laugalys V., Straiˇzys V., Vrba F.J., Cernisˇ K., Kazlauskas A., Boyle R. P., Philip A.G.D. 2007, ”CCD Photometry and Classification of Stars in the North America and Pelican Nebulae Region. IV. The Region of a Supposed Cluster Collinder 428”, Baltic Astronomy, 16, 349 8. Straiˇzys V., Corbally C. J., Laugalys V. 2008, ”2MASS Two-color Interstellar Redden- ing Line in the Direction of the North America and Pelican Nebulae and the Cyg OB2 Association”, Baltic Astronomy, 17, 125 9. Straiˇzys V., Laugalys V. 2008, ”O-like Stars in the Direction of the North America and Pelican Nebulae”, Baltic Astronomy, 17, 143 10. Straiˇzys V., Laugalys V. 2008, ”2MASS Two-color Interstellar Reddening Lines in the Inner Galaxy”, Baltic Astronomy, 17, 253 CONTRIBUTION RELATED TO THE DISSERTATION AT THE INTERNATIONAL CONFERENCES 1. Laugalys V. ”Vilnius, 2MASS and IRAS data together”, in Str¨omvil workshop, Poland, Krakow 2008 September 11 2. Laugalys V. ”An Experience with Aperture and PSF Reductions of CCD Exposures from Flagstaff”, in Str¨omvil workshop, Lithuania, Mol˙etai 2006. August 28 - September 09 3. Boyle R. P., Janusz R., Philip A. G. D. , Laugalys V., Kazlauskas A. ”CCD Flatfielding for Str¨omvil Photometry in M 67”, in American Astronomical Society Meeting 207, # 29.06; Bulletin of the American Astronomical Society, Vol. 37, p.1212, 2005 4. Boyle R. P., Janusz R., Philip A. G. D. , Laugalys V. ”Automation and Iteration Methods for Processing CCD Stellar Photometry in the Str¨omvil System”, in American Astronom- ical Society Meeting 205, # 153.02; Bulletin of the American Astronomical Society, Vol. 36, p.1602, 2004 5. Straiˇzys V., Zdanaviˇcius J., Zdanaviˇcius K., Laugalys V., Kazlauskas A., Cernisˇ K., Boyle R. P., Philip A. G. D. 2004, ”Interstellar extinction in the MBM 12 molecular cloud area in Aries”, American Astronomical Society Meeting 205, # 59.04; Bulletin of the American Astronomical Society, Vol. 36, p.1439, 2004 6. Laugalys V., Boyle R.P., Kazlauskas A., Vrba F. J., Philip A. G. D. , Straiˇzys V. , ”Ac- curacy of CCD photometry: open cluster M67” in Dynamical and Chemical Evolution of Galactic Star Clusters, Taiwan, Chung-Li, National Central University, 2003 November 24-28 7. Laugalys V., Boyle R. P., Kazlauskas A., Vrba F.J., Philip A. G. D. Straiˇzys V. ”Large- Scale Errors in CCD Photometry of M67” in Stellar Photometry: Past, Present and Future, Lithuania, Vilnius 2003 September 17-20 5 8. Boyle R. P., Janusz R., Philip A. G. D. , Kazlauskas A., Laugalys V. ”Flatfielding Errors in Stromvil CCD Photometry” in Stellar Photometry: Past, Present and Future, Lithuania, Vilnius 2003 September 17-20 9. Boyle R. P., Janusz R., Laugalys V., Philip A. G. D. ”CCD Flatfield Correction by Dif- ferential Stellar Photometry: Automated Methods”, in American Astronomical Society Meeting 203, # 04.02; Bulletin of the American Astronomical Society, Vol. 35, p.1207, 2003 10. Boyle R. P., Laugalys V., Philip A. G. D. ”Flatfield Correction by Differential CCD Photometry in M67”, in American Astronomical Society, 201, # 91.09; Bulletin of the American Astronomical Society, Vol. 34, p.1257, 2002 11. Corbally C., Straiˇzys V., Laugalys V. ”Interstellar Extinction Law in the Vicinity of the North America and Pelican Nebulae”, in American Astronomical Society, 195, # 74.01; Bulletin of the American Astronomical Society, Vol. 31, p.1478, 1999 6 The main aim of the dissertation The main aim of this work was a comprehensive photometric investigation of the Milky Way region at Galactic longitudes around l=83◦–87◦ in the direction of the North America and Pelican nebulae in order to get distances, absorbing properties of the dust
Recommended publications
  • Winter Constellations

    Winter Constellations

    Winter Constellations *Orion *Canis Major *Monoceros *Canis Minor *Gemini *Auriga *Taurus *Eradinus *Lepus *Monoceros *Cancer *Lynx *Ursa Major *Ursa Minor *Draco *Camelopardalis *Cassiopeia *Cepheus *Andromeda *Perseus *Lacerta *Pegasus *Triangulum *Aries *Pisces *Cetus *Leo (rising) *Hydra (rising) *Canes Venatici (rising) Orion--Myth: Orion, the great ​ ​ hunter. In one myth, Orion boasted he would kill all the wild animals on the earth. But, the earth goddess Gaia, who was the protector of all animals, produced a gigantic scorpion, whose body was so heavily encased that Orion was unable to pierce through the armour, and was himself stung to death. His companion Artemis was greatly saddened and arranged for Orion to be immortalised among the stars. Scorpius, the scorpion, was placed on the opposite side of the sky so that Orion would never be hurt by it again. To this day, Orion is never seen in the sky at the same time as Scorpius. DSO’s ● ***M42 “Orion Nebula” (Neb) with Trapezium A stellar ​ ​ ​ nursery where new stars are being born, perhaps a thousand stars. These are immense clouds of interstellar gas and dust collapse inward to form stars, mainly of ionized hydrogen which gives off the red glow so dominant, and also ionized greenish oxygen gas. The youngest stars may be less than 300,000 years old, even as young as 10,000 years old (compared to the Sun, 4.6 billion years old). 1300 ly. ​ ​ 1 ● *M43--(Neb) “De Marin’s Nebula” The star-forming ​ “comma-shaped” region connected to the Orion Nebula. ● *M78--(Neb) Hard to see. A star-forming region connected to the ​ Orion Nebula.
  • Ioptron AZ Mount Pro Altazimuth Mount Instruction

    Ioptron AZ Mount Pro Altazimuth Mount Instruction

    ® iOptron® AZ Mount ProTM Altazimuth Mount Instruction Manual Product #8900, #8903 and #8920 This product is a precision instrument. Please read the included QSG before assembling the mount. Please read the entire Instruction Manual before operating the mount. If you have any questions please contact us at [email protected] WARNING! NEVER USE A TELESCOPE TO LOOK AT THE SUN WITHOUT A PROPER FILTER! Looking at or near the Sun will cause instant and irreversible damage to your eye. Children should always have adult supervision while observing. 2 Table of Content Table of Content ......................................................................................................................................... 3 1. AZ Mount ProTM Altazimuth Mount Overview...................................................................................... 5 2. AZ Mount ProTM Mount Assembly ........................................................................................................ 6 2.1. Parts List .......................................................................................................................................... 6 2.2. Identification of Parts ....................................................................................................................... 7 2.3. Go2Nova® 8407 Hand Controller .................................................................................................... 8 2.3.1. Key Description .......................................................................................................................
  • Modeling of PMS Ae/Fe Stars Using UV Spectra�,

    Modeling of PMS Ae/Fe Stars Using UV Spectra,

    A&A 456, 1045–1068 (2006) Astronomy DOI: 10.1051/0004-6361:20040269 & c ESO 2006 Astrophysics Modeling of PMS Ae/Fe stars using UV spectra, P. F. C. Blondel1,2 andH.R.E.TjinADjie1 1 Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands e-mail: [email protected] 2 SARA, Kruislaan 415, 1098 SJ Amsterdam, The Netherlands Received 13 February 2004 / Accepted 13 October 2005 ABSTRACT Context. Spectral classification of PMS Ae/Fe stars, based on visual observations, may lead to ambiguous conclusions. Aims. We aim to reduce these ambiguities by using UV spectra for the classification of these stars, because the rise of the continuum in the UV is highly sensitive to the stellar spectral type of A/F-type stars. Methods. We analyse the low-resolution UV spectra in terms of a 3-component model, that consists of spectra of a central star, of an optically-thick accretion disc, and of a boundary-layer between the disc and star. The disc-component was calculated as a juxtaposition of Planck spectra, while the 2 other components were simulated by the low-resolution UV spectra of well-classified standard stars (taken from the IUE spectral atlases). The hot boundary-layer shows strong similarities to the spectra of late-B type supergiants (see Appendix A). Results. We modeled the low-resolution UV spectra of 37 PMS Ae/Fe stars. Each spectral match provides 8 model parameters: spectral type and luminosity-class of photosphere and boundary-layer, temperature and width of the boundary-layer, disc-inclination and circumstellar extinction.
  • A Basic Requirement for Studying the Heavens Is Determining Where In

    A Basic Requirement for Studying the Heavens Is Determining Where In

    Abasic requirement for studying the heavens is determining where in the sky things are. To specify sky positions, astronomers have developed several coordinate systems. Each uses a coordinate grid projected on to the celestial sphere, in analogy to the geographic coordinate system used on the surface of the Earth. The coordinate systems differ only in their choice of the fundamental plane, which divides the sky into two equal hemispheres along a great circle (the fundamental plane of the geographic system is the Earth's equator) . Each coordinate system is named for its choice of fundamental plane. The equatorial coordinate system is probably the most widely used celestial coordinate system. It is also the one most closely related to the geographic coordinate system, because they use the same fun­ damental plane and the same poles. The projection of the Earth's equator onto the celestial sphere is called the celestial equator. Similarly, projecting the geographic poles on to the celest ial sphere defines the north and south celestial poles. However, there is an important difference between the equatorial and geographic coordinate systems: the geographic system is fixed to the Earth; it rotates as the Earth does . The equatorial system is fixed to the stars, so it appears to rotate across the sky with the stars, but of course it's really the Earth rotating under the fixed sky. The latitudinal (latitude-like) angle of the equatorial system is called declination (Dec for short) . It measures the angle of an object above or below the celestial equator. The longitud inal angle is called the right ascension (RA for short).
  • Evolution of Star Clusters in Time-Variable Tidal Fields

    Evolution of Star Clusters in Time-Variable Tidal Fields

    Evolution of Star Clusters in Time-Variable Tidal Fields A Thesis Submitted to the Faculty of Drexel University by Ernest N. Mamikonyan in partial fulfillment of the requirement for the degree of Doctor of Philosophy December 12, 2013 Contents 1 Introduction 1 1.1 TypesofStarClusters............................ 2 1.1.1 GlobularClusters .......................... 3 1.1.2 OpenClusters............................ 4 1.2 Mass Function: From Young to Globular . 5 2 Arbitrary Tidal Acceleration 8 2.1 ApproximatingTidalEffects. 9 2.1.1 Tidal Acceleration Tensor . 10 2.2 Stellar Dynamics with KIRA ........................ 11 2.2.1 CircularOrbitinPoint-MassPotential . 14 2.3 GalaxyMergerSimulations . 16 2.3.1 TidalHistories............................ 19 2.4 N-BodySimulations ............................ 24 2.4.1 N-BodyUnits ............................ 26 2.4.2 Scaling ................................ 26 3 Mass Loss Model 30 i 3.1 Accelerated Two-Body Relaxation . 30 3.2 FluctuationsintheJacobiRadius. 34 3.3 Results .................................... 36 3.4 Discussion.................................. 37 3.4.1 Limitations ............................. 40 4 Globular Cluster Mass Functions 44 4.1 MassFunctionEvolution . 47 4.2 Results .................................... 48 4.2.1 SinkParticles ............................ 48 4.2.2 DiskParticles ............................ 50 4.2.3 HaloParticles ............................ 55 5 Conclusions and Future Work 57 Appendix A Implementation of Tidal Fields in KIRA 63 Appendix B Computing Tidal Acceleration from GADGET Output 66 ii List of Figures 1.1 Infrared image of the globular cluster Omega Centauri. It is the most massive cluster in the Galaxy and thought to be a remnant of a dwarf galaxy absorbed by the Milky Way. (NASA/JPL-Caltech/ NOAO/AURA/NSF)............................. 3 1.2 The Pleiades open cluster in the infrared. It is one of the most well- known and spectacular objects in the Galaxy.
  • Iceland Panorama

    Iceland Panorama

    Iceland Panorama August 5th - 12th 2018 From steamy hot springs to top-notch spas, spectacular scenery to magnificent art museums, this unique land is the perfect place to relax, recharge, and explore. Legends say that the ancient gods themselves guided Iceland’s first settler, Ingolfur Arnarson, to make his home in Reykjavik (“Smoky Bay”), named after the geothermal steam he saw. Today this geothermal energy heats homes and outdoor swimming pools throughout the city – a pollution-free energy source that leaves the air outstandingly fresh, clean and clear. Renowned for its spellbinding beauty and stunning landscape, Iceland is the only place on Earth where you can stand on top of the Atlantic Ocean’s submarine mountain chain - for the island is the only place where the chain peaks up above sea level! From this perch, we can walk from North America to Europe. We’ll journey through the north, south, and west of the island, enjoying the long evening twilight of the northern summer and visit a wondrous variety of small settlements, good-size towns and amazing natural landscapes. This captivating geological wonderland offers the opportunity to explore dramatic phenomena: colossal glaciers, active volcanoes, geysers, hot springs, glacial rivers, cascading waterfalls, moss-covered lava fields, and glacial lagoons. We’ll dine on Icelandic specialties, including seafood, ocean-fresh from the morning’s catch; highland lamb; and unusual varieties of game. It’s purely natural food imaginatively served. The cost of this itinerary, per person, double occupancy is: Join a Tufts faculty host and specially selected local guide, Boston Departure $3990 Svanur Thorkelsson on an amazing adventure this summer Land only (no airfare included) $3290 to the Land of Fire and Ice.
  • ESSENTIALS of METEOROLOGY (7Th Ed.) GLOSSARY

    ESSENTIALS of METEOROLOGY (7Th Ed.) GLOSSARY

    ESSENTIALS OF METEOROLOGY (7th ed.) GLOSSARY Chapter 1 Aerosols Tiny suspended solid particles (dust, smoke, etc.) or liquid droplets that enter the atmosphere from either natural or human (anthropogenic) sources, such as the burning of fossil fuels. Sulfur-containing fossil fuels, such as coal, produce sulfate aerosols. Air density The ratio of the mass of a substance to the volume occupied by it. Air density is usually expressed as g/cm3 or kg/m3. Also See Density. Air pressure The pressure exerted by the mass of air above a given point, usually expressed in millibars (mb), inches of (atmospheric mercury (Hg) or in hectopascals (hPa). pressure) Atmosphere The envelope of gases that surround a planet and are held to it by the planet's gravitational attraction. The earth's atmosphere is mainly nitrogen and oxygen. Carbon dioxide (CO2) A colorless, odorless gas whose concentration is about 0.039 percent (390 ppm) in a volume of air near sea level. It is a selective absorber of infrared radiation and, consequently, it is important in the earth's atmospheric greenhouse effect. Solid CO2 is called dry ice. Climate The accumulation of daily and seasonal weather events over a long period of time. Front The transition zone between two distinct air masses. Hurricane A tropical cyclone having winds in excess of 64 knots (74 mi/hr). Ionosphere An electrified region of the upper atmosphere where fairly large concentrations of ions and free electrons exist. Lapse rate The rate at which an atmospheric variable (usually temperature) decreases with height. (See Environmental lapse rate.) Mesosphere The atmospheric layer between the stratosphere and the thermosphere.
  • Romancing the Stockholm Syndrome: Desensitizing Readers to Obsessive and Abusive Behavior in Contemporary Young Adult Literature

    Romancing the Stockholm Syndrome: Desensitizing Readers to Obsessive and Abusive Behavior in Contemporary Young Adult Literature

    Romancing the Stockholm Syndrome: Desensitizing Readers to Obsessive and Abusive Behavior in Contemporary Young Adult Literature Lauren Staub Honors Thesis, Spring 2013 Thesis Director: Terry Harpold Reader: Anastasia Ulanowicz Contemporary works of young adult (or “YA”) literature written and marketed primarily for adolescent girls often depend upon conventional narratives that feature the damsel in distress – that is, plots in which the young woman who needs to be saved from her surroundings, or even herself, by a young man. Such privileging of masculine power – even in contemporary and purportedly progressive narratives – reaffirms the conservative notion that men still hold the power in relationships, that men's mastery over their female partners is an appropriate expression of passion and attraction. But what happens when the characters in such texts – as well as their readers – confuse abuse for passion? Young women reading stories that portray controlling or over-protective men as paradigms of romance are, I propose, being desensitized to obsessive and abusive behavior. Forced captivity and stalking, along with other dangerous behaviors should not be mistaken for passionate love. Passive surrender to overheated, manipulative and aggressive suitors (the classic "bad boy" of these YA novels) means surrendering independent agency and defining desire and love in only reactive ways. This is not a positive model for female readers. Page 1 of 26 In this thesis, then, I will analyze three popular YA novels written primarily for female readers in order to study how the novels employ, and occasionally justify kidnapping and Stockholm Syndrome plots. I will briefly consider literature on the psychiatric condition of Stockholm Syndrome and its popular representation in fiction.
  • Binocular Double Star Logbook

    Binocular Double Star Logbook

    Astronomical League Binocular Double Star Club Logbook 1 Table of Contents Alpha Cassiopeiae 3 14 Canis Minoris Sh 251 (Oph) Psi 1 Piscium* F Hydrae Psi 1 & 2 Draconis* 37 Ceti Iota Cancri* 10 Σ2273 (Dra) Phi Cassiopeiae 27 Hydrae 40 & 41 Draconis* 93 (Rho) & 94 Piscium Tau 1 Hydrae 67 Ophiuchi 17 Chi Ceti 35 & 36 (Zeta) Leonis 39 Draconis 56 Andromedae 4 42 Leonis Minoris Epsilon 1 & 2 Lyrae* (U) 14 Arietis Σ1474 (Hya) Zeta 1 & 2 Lyrae* 59 Andromedae Alpha Ursae Majoris 11 Beta Lyrae* 15 Trianguli Delta Leonis Delta 1 & 2 Lyrae 33 Arietis 83 Leonis Theta Serpentis* 18 19 Tauri Tau Leonis 15 Aquilae 21 & 22 Tauri 5 93 Leonis OΣΣ178 (Aql) Eta Tauri 65 Ursae Majoris 28 Aquilae Phi Tauri 67 Ursae Majoris 12 6 (Alpha) & 8 Vul 62 Tauri 12 Comae Berenices Beta Cygni* Kappa 1 & 2 Tauri 17 Comae Berenices Epsilon Sagittae 19 Theta 1 & 2 Tauri 5 (Kappa) & 6 Draconis 54 Sagittarii 57 Persei 6 32 Camelopardalis* 16 Cygni 88 Tauri Σ1740 (Vir) 57 Aquilae Sigma 1 & 2 Tauri 79 (Zeta) & 80 Ursae Maj* 13 15 Sagittae Tau Tauri 70 Virginis Theta Sagittae 62 Eridani Iota Bootis* O1 (30 & 31) Cyg* 20 Beta Camelopardalis Σ1850 (Boo) 29 Cygni 11 & 12 Camelopardalis 7 Alpha Librae* Alpha 1 & 2 Capricorni* Delta Orionis* Delta Bootis* Beta 1 & 2 Capricorni* 42 & 45 Orionis Mu 1 & 2 Bootis* 14 75 Draconis Theta 2 Orionis* Omega 1 & 2 Scorpii Rho Capricorni Gamma Leporis* Kappa Herculis Omicron Capricorni 21 35 Camelopardalis ?? Nu Scorpii S 752 (Delphinus) 5 Lyncis 8 Nu 1 & 2 Coronae Borealis 48 Cygni Nu Geminorum Rho Ophiuchi 61 Cygni* 20 Geminorum 16 & 17 Draconis* 15 5 (Gamma) & 6 Equulei Zeta Geminorum 36 & 37 Herculis 79 Cygni h 3945 (CMa) Mu 1 & 2 Scorpii Mu Cygni 22 19 Lyncis* Zeta 1 & 2 Scorpii Epsilon Pegasi* Eta Canis Majoris 9 Σ133 (Her) Pi 1 & 2 Pegasi Δ 47 (CMa) 36 Ophiuchi* 33 Pegasi 64 & 65 Geminorum Nu 1 & 2 Draconis* 16 35 Pegasi Knt 4 (Pup) 53 Ophiuchi Delta Cephei* (U) The 28 stars with asterisks are also required for the regular AL Double Star Club.
  • Also Available in PDF

    Also Available in PDF

    University of Hawai‘i, Institute for Astronomy Publications in Calendar Year 2000 PUBLICATIONS Investigating the Link between Cometary and Interstellar Material. A&A, 353, 1101–1114 (2000) The following articles and books were published dur- ing calendar year 2000. The names of IfA authors Boehnhardt, H.; Hainaut, O.; Delahodde, C.; West, R.; are in boldface. For an html version of this list Meech, K.; Marsden, B. A Pencil-Beam Search for Dis- with links, go to http://www.ifa.hawaii.edu/publications/ tant TNOs at the ESO NTT. In Minor Bodies in the Outer 2000pubs.html. More recent publications are listed at Solar System, ed. A. Fitzsimmons, D. Jewitt, & R. M. http://www.ifa.hawaii.edu/publications/preprints/. West. ESO Astrophysics Symposia (Springer), 117–123 (2000) Barger, A. J.; Cowie, L. L.; Richards, E. A. Mapping the Evolution of High-Redshift Dusty Galaxies with Submil- Boesgaard, A. M. Review of Stellar Abundance Results from limeter Observations of a Radio-selected Sample. AJ, Large Telescopes. Proc. SPIE, 4005, 142–149 (2000) 119, 2092–2109 (2000) Boesgaard, A. M.; Stephens, A.; King, J. R.; Deliyannis, Barucci, M. A.; Romon, J.; Doressoundiram, A.; Tholen, C. P. Chemical Abundances in Globular Cluster Turn-Off D. J. Compositional Surface Diversity in the Trans-Nep- Stars from Keck/HIRES Observations. Proc. SPIE, 4005, tunian Objects. AJ, 120, 496–500 (2000) 274–284 (2000) Baudoz, P.; Mouillet, D.; Beuzit, J.-L.; Mekarnia, D.; Rab- Brandner, W.; Grebel, E. K.; Chu, Y.; Dottori, H.; Brandl, bia, Y.; Gay, J.; Schneider, J.-L. First Results of the B.; Richling, S.; Yorke, H.
  • 2018 Observatory Schedule

    2018 Observatory Schedule

    Astronomy Club of Akron 2018 Observatory Schedule 5031 Manchester Road, Akron, OH www.acaoh.org – The following events are open to the public. Please join us for stargazing and educational activities. Please arrive on time to avoid headlight distraction. – For notice of “impromptu star parties” not listed, send e-mail to [email protected] to request e-mail notification of unscheduled observing sessions. – Events will be cancelled if skies are cloudy. Always check website for star party status two hours before event. – This is an outdoor activity in an unheated environment. Nighttime temperatures drop rapidly, even during summer. A general rule of thumb is to dress for 15 degrees colder than predicted nighttime low temperature. – Please respect those who bring their own telescopes. Children should be supervised at all times. The observatory grounds is no place for toys or tomfoolery. – Please, no smoking on observatory grounds. Please, no use of cell phones or tablets in observatory (to preserve night vision). March 17 – 7:45pm July 7 – 9:00pm View the Great Orion Nebula & the beautiful star clusters of The Ring Nebula is a stunning sight in the 16” observatory Auriga through the 16” observatory telescope and view telescope; placed in the Milky Way, observers can see the Pleiades, Hyades, & Beehive Cluster through the 100mm nebula set in a field rich with stars. wide field telescope. Sky Tour: Winter Constellations July 14 – 8:45pm April 7 – 8:00pm Planet Night – Observe Venus at star party start. Jupiter and Special Event: Messier Marathon – stay all night to observe Saturn are well-placed during the observing session.
  • Arxiv:1608.03799V1 [Astro-Ph.SR] 12 Aug 2016 Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35

    Arxiv:1608.03799V1 [Astro-Ph.SR] 12 Aug 2016 Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35

    Draft version November 15, 2018 Preprint typeset using LATEX style AASTeX6 v. 1.0 FORMATION OF THE UNEQUAL-MASS BINARY PROTOSTARS IN L1551 NE BY ROTATIONALLY-DRIVEN FRAGMENTATION Jeremy Lim Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong & Laboratory for Space Research, Faculty of Science, The University of Hong Kong, Pokfulam Road, Hong Kong Tomoyuki Hanawa Center for Frontier Science, Chiba University, Inage-ku, Chiba 263-8522, Japan Paul K. H. Yeung Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong Shigehisa Takakuwa arXiv:1608.03799v1 [astro-ph.SR] 12 Aug 2016 Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima, 890-0065, Japan Tomoaki Matsumoto Faculty of Humanity and Environment, Hosei University, Chiyoda-ku, Tokyo 102-8160, Japan 2 Kazuya Saigo Department of Physical Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan ABSTRACT We present observations at 7 mm that fully resolve the two circumstellar disks, and a reanalyses of archival observations at 3.5 cm that resolve along their major axes the two ionized jets, of the class I binary protostellar system L1551 NE. We show that the two circumstellar disks are better fit by a shallow inner and steep outer power-law than a truncated power-law. The two disks have very different transition radii between their inner and outer regions of ∼18.6 AU and ∼8.9 AU respectively. Assuming that they are intrinsically circular and geometrically thin, we find that the two circumstellar disks are parallel with each other and orthogonal in projection to their respective ionized jets.