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1989Aj 97. . 51 Om the Astronomical Journal Volume 97, Number 2 February 1989 Iccd Speckle Observations of Binary Stars. Iv
OM 51 . THE ASTRONOMICAL JOURNAL VOLUME 97, NUMBER 2 FEBRUARY 1989 97. ICCD SPECKLE OBSERVATIONS OF BINARY STARS. IV. MEASUREMENTS DURING 1986-1988 FROM THE KITT PEAK 4 m TELESCOPE Harold A. McAlister,a) William I. Hartkopf,a) James R. Sowell,10 1989AJ and Edmund G. Dombrowski“’ Center for High Angular Resolution Astronomy, Georgia State University, Atlanta, Georgia 30303 OttoG. Franz3) Lowell Observatory, Flagstaff, Arizona 86001 Received 29 August 1988; revised 12 October 1988 ABSTRACT One thousand five hundred and fifty measurements of 1006 binary star systems observed mostly during 1986 through mid-1988 by means of speckle interferometry with the KPNO 4 m telescope are present- ed. Twenty-one systems are directly resolved for the first time, including new components to the cool supergiant a Her A and the Pleiades shell star Pleione. A continuing survey of The Bright Star Cata- logue yielded eight new binaries from 293 bright stars observed. Corrections to speckle measures from the GSU/CHARA ICCD speckle camera previously published are presented and discussed. I. INTRODUCTION for the 1983-1984 data is due to the somewhat lower quality This paper presents further results from a continuing pro- of the calibration data available for that particular time peri- gram of binary star speckle interferometry carried out at the od. We now adopt a calibration based upon the mean of all 4 m Mayall telescope at Kitt Peak National Observatory. A the scale and orientation measurements that we have deter- detailed description of the observational technique and in- mined since the initiation of our ICCD speckle-camera sys- strumentation, and of the methods of data reduction, analy- tem. -
JOHN R. THORSTENSEN Address
CURRICULUM VITAE: JOHN R. THORSTENSEN Address: Department of Physics and Astronomy Dartmouth College 6127 Wilder Laboratory Hanover, NH 03755-3528; (603)-646-2869 [email protected] Undergraduate Studies: Haverford College, B. A. 1974 Astronomy and Physics double major, High Honors in both. Graduate Studies: Ph. D., 1980, University of California, Berkeley Astronomy Department Dissertation : \Optical Studies of Faint Blue X-ray Stars" Graduate Advisor: Professor C. Stuart Bowyer Employment History: Department of Physics and Astronomy, Dartmouth College: { Professor, July 1991 { present { Associate Professor, July 1986 { July 1991 { Assistant Professor, September 1980 { June 1986 Research Assistant, Space Sciences Lab., U.C. Berkeley, 1975 { 1980. Summer Student, National Radio Astronomy Observatory, 1974. Summer Student, Bartol Research Foundation, 1973. Consultant, IBM Corporation, 1973. (STARMAP program). Honors and Awards: Phi Beta Kappa, 1974. National Science Foundation Graduate Fellow, 1974 { 1977. Dorothea Klumpke Roberts Award of the Berkeley Astronomy Dept., 1978. Professional Societies: American Astronomical Society Astronomical Society of the Pacific International Astronomical Union Lifetime Publication List * \Can Collapsed Stars Close the Universe?" Thorstensen, J. R., and Partridge, R. B. 1975, Ap. J., 200, 527. \Optical Identification of Nova Scuti 1975." Raff, M. I., and Thorstensen, J. 1975, P. A. S. P., 87, 593. \Photometry of Slow X-ray Pulsars II: The 13.9 Minute Period of X Persei." Margon, B., Thorstensen, J., Bowyer, S., Mason, K. O., White, N. E., Sanford, P. W., Parkes, G., Stone, R. P. S., and Bailey, J. 1977, Ap. J., 218, 504. \A Spectrophotometric Survey of the A 0535+26 Field." Margon, B., Thorstensen, J., Nelson, J., Chanan, G., and Bowyer, S. -
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. -
Annual Report 2016–2017 AAVSO
AAVSO The American Association of Variable Star Observers Annual Report 2016–2017 AAVSO Annual Report 2012 –2013 The American Association of Variable Star Observers AAVSO Annual Report 2016–2017 The American Association of Variable Star Observers 49 Bay State Road Cambridge, MA 02138-1203 USA Telephone: 617-354-0484 Fax: 617-354-0665 email: [email protected] website: https://www.aavso.org Annual Report Website: https://www.aavso.org/annual-report On the cover... At the 2017 AAVSO Annual Meeting.(clockwise from upper left) Knicole Colon, Koji Mukai, Dennis Conti, Kristine Larsen, Joey Rodriguez; Rachid El Hamri, Andy Block, Jane Glanzer, Erin Aadland, Jamin Welch, Stella Kafka; and (clockwise from upper left) Joey Rodriguez, Knicole Colon, Koji Mukai, Frans-Josef “Josch” Hambsch, Chandler Barnes. Picture credits In additon to images from the AAVSO and its archives, the editors gratefully acknowledge the following for their image contributions: Glenn Chaple, Shawn Dvorak, Mary Glennon, Bill Goff, Barbara Harris, Mario Motta, NASA, Gary Poyner, Msgr. Ronald Royer, the Mary Lea Shane Archives of the Lick Observatory, Chris Stephan, and Wheatley, et al. 2003, MNRAS, 345, 49. Table of Contents 1. About the AAVSO Vision and Mission Statement 1 About the AAVSO 1 What We Do 2 What Are Variable Stars? 3 Why Observe Variable Stars? 3 The AAVSO International Database 4 Observing Variable Stars 6 Services to Astronomy 7 Education and Outreach 9 2. The Year in Review Introduction 11 The 106th AAVSO Spring Membership Meeting, Ontario, California 11 The -
Astronomy Binder
Astronomy Binder Bloomington High School South 2011 Contents 1 Astronomical Distances 2 1.1 Geometric Methods . 2 1.2 Spectroscopic Methods . 4 1.3 Standard Candle Methods . 4 1.4 Cosmological Redshift . 5 1.5 Distances to Galaxies . 5 2 Age and Size 6 2.1 Measuring Age . 6 2.2 Measuring Size . 7 3 Variable Stars 7 3.1 Pulsating Variable Stars . 7 3.1.1 Cepheid Variables . 7 3.1.2 RR Lyrae Variables . 8 3.1.3 RV Tauri Variables . 8 3.1.4 Long Period/Semiregular Variables . 8 3.2 Binary Variables . 8 3.3 Cataclysmic Variables . 11 3.3.1 Classical Nova . 11 3.3.2 Recurrent Novae . 11 3.3.3 Dwarf Novae (U Geminorum) . 11 3.3.4 X-Ray Binary . 11 3.3.5 Polar (AM Herculis) star . 12 3.3.6 Intermediate Polar (DQ Herculis) star . 12 3.3.7 Super Soft Source (SSS) . 12 3.3.8 VY Sculptoris stars . 12 3.3.9 AM Canum Venaticorum stars . 12 3.3.10 SW Sextantis stars . 13 3.3.11 Symbiotic Stars . 13 3.3.12 Pulsating White Dwarfs . 13 4 Galaxy Classification 14 4.1 Elliptical Galaxies . 14 4.2 Spirals . 15 4.3 Classification . 16 4.4 The Milky Way Galaxy (MWG . 19 4.4.1 Scale Height . 19 4.4.2 Magellanic Clouds . 20 5 Galaxy Interactions 20 6 Interstellar Medium 21 7 Active Galactic Nuclei 22 7.1 AGN Equations . 23 1 8 Spectra 25 8.1 21 cm line . 26 9 Black Holes 26 9.1 Stellar Black Holes . -
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). -
Ghost Imaging of Space Objects
Ghost Imaging of Space Objects Dmitry V. Strekalov, Baris I. Erkmen, Igor Kulikov, and Nan Yu Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099 USA NIAC Final Report September 2014 Contents I. The proposed research 1 A. Origins and motivation of this research 1 B. Proposed approach in a nutshell 3 C. Proposed approach in the context of modern astronomy 7 D. Perceived benefits and perspectives 12 II. Phase I goals and accomplishments 18 A. Introducing the theoretical model 19 B. A Gaussian absorber 28 C. Unbalanced arms configuration 32 D. Phase I summary 34 III. Phase II goals and accomplishments 37 A. Advanced theoretical analysis 38 B. On observability of a shadow gradient 47 C. Signal-to-noise ratio 49 D. From detection to imaging 59 E. Experimental demonstration 72 F. On observation of phase objects 86 IV. Dissemination and outreach 90 V. Conclusion 92 References 95 1 I. THE PROPOSED RESEARCH The NIAC Ghost Imaging of Space Objects research program has been carried out at the Jet Propulsion Laboratory, Caltech. The program consisted of Phase I (October 2011 to September 2012) and Phase II (October 2012 to September 2014). The research team consisted of Drs. Dmitry Strekalov (PI), Baris Erkmen, Igor Kulikov and Nan Yu. The team members acknowledge stimulating discussions with Drs. Leonidas Moustakas, Andrew Shapiro-Scharlotta, Victor Vilnrotter, Michael Werner and Paul Goldsmith of JPL; Maria Chekhova and Timur Iskhakov of Max Plank Institute for Physics of Light, Erlangen; Paul Nu˜nez of Coll`ege de France & Observatoire de la Cˆote d’Azur; and technical support from Victor White and Pierre Echternach of JPL. -
LIST of PUBLICATIONS Aryabhatta Research Institute of Observational Sciences ARIES (An Autonomous Scientific Research Institute
LIST OF PUBLICATIONS Aryabhatta Research Institute of Observational Sciences ARIES (An Autonomous Scientific Research Institute of Department of Science and Technology, Govt. of India) Manora Peak, Naini Tal - 263 129, India (1955−2020) ABBREVIATIONS AA: Astronomy and Astrophysics AASS: Astronomy and Astrophysics Supplement Series ACTA: Acta Astronomica AJ: Astronomical Journal ANG: Annals de Geophysique Ap. J.: Astrophysical Journal ASP: Astronomical Society of Pacific ASR: Advances in Space Research ASS: Astrophysics and Space Science AE: Atmospheric Environment ASL: Atmospheric Science Letters BA: Baltic Astronomy BAC: Bulletin Astronomical Institute of Czechoslovakia BASI: Bulletin of the Astronomical Society of India BIVS: Bulletin of the Indian Vacuum Society BNIS: Bulletin of National Institute of Sciences CJAA: Chinese Journal of Astronomy and Astrophysics CS: Current Science EPS: Earth Planets Space GRL : Geophysical Research Letters IAU: International Astronomical Union IBVS: Information Bulletin on Variable Stars IJHS: Indian Journal of History of Science IJPAP: Indian Journal of Pure and Applied Physics IJRSP: Indian Journal of Radio and Space Physics INSA: Indian National Science Academy JAA: Journal of Astrophysics and Astronomy JAMC: Journal of Applied Meterology and Climatology JATP: Journal of Atmospheric and Terrestrial Physics JBAA: Journal of British Astronomical Association JCAP: Journal of Cosmology and Astroparticle Physics JESS : Jr. of Earth System Science JGR : Journal of Geophysical Research JIGR: Journal of Indian -
Arxiv:2103.07476V1 [Astro-Ph.GA] 12 Mar 2021
FERMILAB-PUB-21-075-AE-LDRD Draft version September 3, 2021 Typeset using LATEX twocolumn style in AASTeX63 The DECam Local Volume Exploration Survey: Overview and First Data Release A. Drlica-Wagner ,1, 2, 3 J. L. Carlin ,4 D. L. Nidever ,5, 6 P. S. Ferguson ,7, 8 N. Kuropatkin ,1 M. Adamow´ ,9, 10 W. Cerny ,2, 3 Y. Choi ,11 J. H. Esteves,12 C. E. Mart´ınez-Vazquez´ ,13 S. Mau ,14, 15 A. E. Miller,16, 17 B. Mutlu-Pakdil ,2, 3 E. H. Neilsen ,1 K. A. G. Olsen ,6 A. B. Pace ,18 A. H. Riley ,7, 8 J. D. Sakowska ,19 D. J. Sand ,20 L. Santana-Silva ,21 E. J. Tollerud ,11 D. L. Tucker ,1 A. K. Vivas ,13 E. Zaborowski,2 A. Zenteno ,13 T. M. C. Abbott ,13 S. Allam ,1 K. Bechtol ,22, 23 C. P. M. Bell ,16 E. F. Bell ,24 P. Bilaji,2, 3 C. R. Bom ,25 J. A. Carballo-Bello ,26 D. Crnojevic´ ,27 M.-R. L. Cioni ,16 A. Diaz-Ocampo,28 T. J. L. de Boer ,29 D. Erkal ,19 R. A. Gruendl ,30, 31 D. Hernandez-Lang,32, 13, 33 A. K. Hughes,20 D. J. James ,34 L. C. Johnson ,35 T. S. Li ,36, 37, 38 Y.-Y. Mao ,39, 38 D. Mart´ınez-Delgado ,40 P. Massana,19, 41 M. McNanna ,22 R. Morgan ,22 E. O. Nadler ,14, 15 N. E. D. Noel¨ ,19 A. Palmese ,1, 2 A. H. G. Peter ,42 E. S. -
Long Delayed Echo: New Approach to the Problem
Geometrical joke(r?)s for SETI. R. T. Faizullin OmSTU, Omsk, Russia Since the beginning of radio era long delayed echoes (LDE) were traced. They are the most likely candidates for extraterrestrial communication, the so-called "paradox of Stormer" or "world echo". By LDE we mean a radio signal with a very long delay time and abnormally low energy loss. Unlike the well-known echoes of the delay in 1/7 seconds, the mechanism of which have long been resolved, the delay of radio signals in a second, ten seconds or even minutes is one of the most ancient and intriguing mysteries of physics of the ionosphere. Nowadays it is difficult to imagine that at the beginning of the century any registered echo signal was treated as extraterrestrial communication: “Notable changes occurred at a fixed time and the analogy among the changes and numbers was so clear, that I could not provide any plausible explanation. I'm familiar with natural electrical interference caused by the activity of the Sun, northern lights and telluric currents, but I was sure, as it is possible to be sure in anything, that the interference was not caused by any of common reason. Only after a while it came to me, that the observed interference may occur as the result of conscious activities. I'm overwhelmed by the the feeling, that I may be the first men to hear greetings transmitted from one planet to the other... Despite the signal being weak and unclear it made me certain that soon people, as one, will direct their eyes full of hope and affection towards the sky, overwhelmed by good news: People! We got the message from an unknown and distant planet. -
The Dipole Anisotropy of the 2 Micron All-Sky Redshift Survey
Mon. Not. R. Astron. Soc. 368, 1515–1526 (2006) doi:10.1111/j.1365-2966.2006.10243.x The dipole anisotropy of the 2 Micron All-Sky Redshift Survey Downloaded from https://academic.oup.com/mnras/article-abstract/368/4/1515/1151639 by MIDDLE EAST TECHNICAL UNIVERSITY LIBRARY user on 24 July 2020 , P. Erdo˘gdu,1,2 J. P. Huchra,3 O. Lahav,2 4 M. Colless,5 R. M. Cutri,6 E. Falco,3 T. George,7 T. Jarrett,6 D. H. Jones,8 C. S. Kochanek,9 L. Macri,10 J. Mader,11 N. Martimbeau,3 M. Pahre,3 Q. Parker,12 A. Rassat4 and W. Saunders5,13 1Department of Physics, Middle East Technical University, 06531 Ankara, Turkey 2School of Physics & Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD 3Harvard-Smithsonian Center of Astrophysics, 60 Garden Street, MS-20, Cambridge, MA 02138, USA 4Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT 5Anglo-Australian Observatory, PO Box 296, Epping, NSW 2052, Australia 6Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USA 7California Institute of Technology, 4800 Oak Grove Drive, 302-231, Pasadena, CA 91109, USA 8Research School of Astronomy and Astrophysics, Mount Stromlo, and Siding Spring Observatories, Cotter Road, Weston Creek, ACT 2611, Australia 9Department of Astronomy, Ohio State University, 4055 McPherson Lab, 140 West 18th Avenue, Columbus, OH 43221, USA 10National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85726, USA 11W.M. Keck Observatory, Kamuela, HI 96743, USA 12Department of Physics, Macquarie University, Sydney, NWS 2109, Australia 13Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ Accepted 2006 February 23. -
Galaxy Data Name Constell
Galaxy Data name constell. quadvel km/s z type width ly starsDist. Satellite Milky Way many many 0 0.0000 SBbc 106K 200M 0 M31 Andromeda NQ1 -301 -0.0010 SA 220K 1T 2.54Mly M32 Andromeda NQ1 -200 -0.0007 cE2 Sat. 5K 2.49Mly M31 M110 Andromeda NQ1 -241 -0.0008 dE 15K 2.69M M31 NGC 404 Andromeda NQ1 -48 -0.0002 SA0 no 10M NGC 891 Andromeda NQ1 528 0.0018 SAb no 27.3M NGC 680 Aries NQ1 2928 0.0098 E pec no 123M NGC 772 Aries NQ1 2472 0.0082 SAb no 130M Segue 2 Aries NQ1 -40 -0.0001 dSph/GC?. 100 5E5 114Kly MW NGC 185 Cassiopeia NQ1 -185 -0.0006dSph/E3 no 2.05Mly M31 Dwingeloo 1 Cassiopeia NQ1 110 0.0004 SBcd 25K 10Mly Dwingeloo 2 Cassiopeia NQ1 94 0.0003Iam no 10Mly Maffei 1 Cassiopeia NQ1 66 0.0002 S0pec E3 75K 9.8Mly Maffei 2 Cassiopeia NQ1 -17 -0.0001 SABbc 25K 9.8Mly IC 1613 Cetus NQ1 -234 -0.0008Irr 10K 2.4M M77 Cetus NQ1 1177 0.0039 SABd 95K 40M NGC 247 Cetus NQ1 0 0.0000SABd 50K 11.1M NGC 908 Cetus NQ1 1509 0.0050Sc 105K 60M NGC 936 Cetus NQ1 1430 0.0048S0 90K 75M NGC 1023 Perseus NQ1 637 0.0021 S0 90K 36M NGC 1058 Perseus NQ1 529 0.0018 SAc no 27.4M NGC 1263 Perseus NQ1 5753 0.0192SB0 no 250M NGC 1275 Perseus NQ1 5264 0.0175cD no 222M M74 Pisces NQ1 857 0.0029 SAc 75K 30M NGC 488 Pisces NQ1 2272 0.0076Sb 145K 95M M33 Triangulum NQ1 -179 -0.0006 SA 60K 40B 2.73Mly NGC 672 Triangulum NQ1 429 0.0014 SBcd no 16M NGC 784 Triangulum NQ1 0 0.0000 SBdm no 26.6M NGC 925 Triangulum NQ1 553 0.0018 SBdm no 30.3M IC 342 Camelopardalis NQ2 31 0.0001 SABcd 50K 10.7Mly NGC 1560 Camelopardalis NQ2 -36 -0.0001Sacd 35K 10Mly NGC 1569 Camelopardalis NQ2 -104 -0.0003Ibm 5K 11Mly NGC 2366 Camelopardalis NQ2 80 0.0003Ibm 30K 10M NGC 2403 Camelopardalis NQ2 131 0.0004Ibm no 8M NGC 2655 Camelopardalis NQ2 1400 0.0047 SABa no 63M Page 1 2/28/2020 Galaxy Data name constell.