DOCSLIB.ORG

Newsletter Archive the Skyscraper January 2018

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Newsletter Archive the Skyscraper January 2018 the vol. 45 no. 01 Skyscraper January 2018 AMATEUR ASTRONOMICAL SOCIETY OF RHODE ISLAND 47 PEEPTOAD ROAD NORTH SCITUATE, RHODE ISLAND 02857 WWW.THESKYSCRAPERS.ORG In This Issue: January Meeting Postponed 2 Enjoy A Starry Tale at Due to winter weather the University of Rhode Island Planetarium 3 The Sun, Moon & Planets in January 4 Astronomical Highlights for 2018 5 Magnitude: The Scale of the Universe 6 NGC 1624 : Cluster & Nebula in Perseus 7 Snowy Worlds Beyond Earth 8 Astrophoto Gallery Skyscrapers Board Meetings Third Monday of the Month All Members Welcome Phases of the Moon Full Wolf Moon January 2 02:24 Last Quarter Moon January 8 22:25 New Moon Seagrave Memorial Observatory January 17 02:17 Open Nights First Quarter Moon January 24 22:20 Saturdays at 7:00 pm weather & conditions permitting Full Blue Moon January 31 13:27 Enjoy A Starry Tale at the University of Rhode Island Planetarium University of Rhode Island Planetarium $5.00, to benefit the University of Rhode Upper College Road Island Planetarium fund. The program will Kingston, RI include a short presentation of Losing the Friday, January 12th, 2018, 6:00 P.M. Dark, why we all should do our best to keep Contact: Francine Jackson: 401-527-5558 the skies as dark as possible, then, after the On Friday, December 9th, the Universi- main program, you will witness a live plan- ty of Rhode Island Planetarium will present etarium introduction to The Skies above the program A Starry Tale. This planetari- the URI campus. um program, a presentation of the Japanese The University of Rhode Island Plane- optical company GOTO, is a beautiful in- tarium is located on Upper College Road, troduction to sky mythology. Join us as we on the Kingston campus, across from the venture back in time to the gods and their Visitors’ Center. interactions with the inhabitants of Earth, The University of Rhode Island Plan- and their hope in our ability to live here in etarium is available for programming for compassion and justice. schools and other organizations. For more A Starry Tale, suitable for all ages, will information, please contact Francine Jack- be offered at 6:00 P.M. Admission is only son at 401-527-5558. Waxing gibbous Moon by Tracy Prell The Skyscraper is published President Public Outreach Coordinator monthly by Skyscrapers, Inc. Steve Siok [email protected] Francine Jackson [email protected] Meetings are held monthly, usually on the first or second 1st Vice President Public Relations Spokesperson Friday or Saturday of the month. Ian Dell’Antonio [email protected] Francine Jackson [email protected] Seagrave Memorial Observatory is open every Saturday night, 2nd Vice President Observatory Committee Chairperson weather permitting. Kathy Siok [email protected] Jim Crawford [email protected] Directions Secretary Membership Activities Coordinator Directions to Seagrave Memorial Observatory are Steve Hubbard [email protected] Pat Landers [email protected] located on the back page of this newsletter. Treasurer Librarian Submissions Submissions to The Skyscraper are always welcome. Lloyd Merrill [email protected] Alex Bergemann [email protected] Please submit items for the newsletter no later than December 15 to Jim Hendrickson, 1 Sunflower Cir- Members at Large Historian cle, North Providence, RI 02911 or e-mail to jim@ Linda Bergemann [email protected] Dave Huestis [email protected] distantgalaxy.com. Tracy Prell [email protected] Archivist E-mail subscriptions Trustees Jim Crawford [email protected] To receive The Skyscraper by e-mail, send e-mail Matt Ouellette [email protected] with your name and address to jim@distantgalaxy. Editor com. Note that you will no longer receive the news- Jeff Padell [email protected] Jim Hendrickson [email protected] letter by postal mail. Tom Thibault [email protected] 2 The Skyscraper January 2018 The Sun, Moon & Planets in January This table contains the ephemeris of the objects in the Solar System for each Saturday night in January 2018. All times are in Eastern Standard Time (UTC-5). Ephemeris times are for Seagrave Observatory (41.845N, 71.590W). Object Date RA Dec Const Mag Size Elong Phase(%) Dist(S) Dist(E) Rise Transit Set Sun 6 19 07.7 -22 31.4 Sgr -26.8 1951.8 - - - 0.98 07:13 11:52 16:31 13 19 38.2 -21 31.2 Sgr -26.8 1951.3 - - - 0.98 07:11 11:55 16:38 20 20 08.2 -20 10.6 Cap -26.8 1950.4 - - - 0.98 07:08 11:57 16:46 27 20 37.5 -18 31.4 Cap -26.8 1949.1 - - - 0.98 07:03 11:59 16:55 Moon 6 10 49.3 9 20.1 Leo -12.5 1922.2 126° W 80 - - 21:00 03:49 10:28 13 16 28.7 -17 20.3 Oph -10.4 1750.7 45° W 14 - - 04:10 09:13 14:12 20 22 14.8 -12 54.1 Aqr -9.8 1800.7 32° E 8 - - 09:09 14:42 20:22 27 4 11.5 15 32.4 Tau -12.4 1981.0 117° E 73 - - 13:07 20:31 04:02 Mercury 6 17 31.5 -21 59.5 Oph -0.2 6.2 22° W 72 0.42 1.10 05:38 10:16 14:54 13 18 10.5 -23 07.9 Sgr -0.2 5.6 20° W 82 0.45 1.21 05:54 10:28 15:01 20 18 53.8 -23 28.0 Sgr -0.2 5.2 18° W 88 0.46 1.29 06:11 10:44 15:17 27 19 39.6 -22 48.5 Sgr -0.3 5.0 14° W 93 0.47 1.35 06:27 11:02 15:39 Venus 6 19 04.6 -23 15.8 Sgr -3.8 9.9 1° W 100 0.73 1.71 07:16 11:49 16:23 13 19 42.6 -22 14.8 Sgr -3.8 9.9 1° E 100 0.73 1.71 07:22 12:00 16:38 20 20 19.8 -20 40.8 Cap -3.8 9.9 3° E 100 0.73 1.71 07:24 12:09 16:55 27 20 56.2 -18 36.9 Cap -3.8 9.9 4° E 100 0.73 1.71 07:24 12:18 17:13 Mars 6 15 00.3 -16 09.6 Lib 1.4 4.9 58° W 93 1.63 1.91 02:41 07:43 12:46 13 15 17.7 -17 23.0 Lib 1.4 5.1 61° W 92 1.62 1.85 02:36 07:33 12:30 20 15 35.3 -18 30.5 Lib 1.3 5.2 64° W 92 1.61 1.78 02:30 07:23 12:16 27 15 53.1 -19 31.7 Lib 1.2 5.4 67° W 91 1.61 1.72 02:25 07:13 12:02 1 Ceres 6 9 33.3 26 36.7 Leo 7.3 0.7 147° W 99 2.58 1.70 18:22 02:11 10:01 13 9 29.5 27 34.7 Leo 7.1 0.8 154° W 99 2.58 1.65 17:45 01:40 09:35 20 9 24.5 28 33.1 Leo 7.0 0.8 161° W 100 2.57 1.62 17:07 01:07 09:07 27 9 18.6 29 28.8 Cnc 6.9 0.8 166° W 100 2.57 1.61 16:29 00:34 08:39 Jupiter 6 15 02.4 -16 06.5 Lib -1.7 33.4 58° W 99 5.43 5.89 02:42 07:44 12:47 13 15 06.8 -16 23.6 Lib -1.7 34.0 64° W 99 5.43 5.79 02:20 07:21 12:23 20 15 10.7 -16 38.7 Lib -1.8 34.6 70° W 99 5.43 5.69 01:57 06:58 11:58 27 15 14.3 -16 51.8 Lib -1.8 35.3 76° W 99 5.43 5.58 01:34 06:34 11:33 Saturn 6 18 08.5 -22 31.7 Sgr 0.5 15.0 14° W 100 10.06 11.02 06:14 10:50 15:26 13 18 12.0 -22 31.1 Sgr 0.5 15.1 20° W 100 10.06 10.98 05:50 10:26 15:02 20 18 15.4 -22 30.2 Sgr 0.5 15.1 26° W 100 10.07 10.94 05:26 10:02 14:38 27 18 18.7 -22 29.1 Sgr 0.6 15.2 33° W 100 10.07 10.88 05:02 09:38 14:13 Uranus 6 1 31.9 8 59.6 Psc 5.8 3.6 99° E 100 19.90 19.73 11:37 18:12 00:46 13 1 32.0 9 00.7 Psc 5.8 3.6 92° E 100 19.90 19.84 11:10 17:45 00:19 20 1 32.4 9 02.8 Psc 5.8 3.5 85° E 100 19.90 19.97 10:42 17:17 23:52 27 1 32.8 9 05.8 Psc 5.8 3.5 78° E 100 19.90 20.08 10:15 16:50 23:25 Neptune 6 22 55.1 -7 53.7 Aqr 7.9 2.2 56° E 100 29.94 30.48 10:02 15:36 21:09 13 22 55.7 -7 49.5 Aqr 7.9 2.2 49° E 100 29.94 30.57 09:35 15:09 20:43 20 22 56.5 -7 44.8 Aqr 7.9 2.2 43° E 100 29.94 30.66 09:08 14:42 20:16 27 22 57.3 -7 39.7 Aqr 8.0 2.2 36° E 100 29.94 30.74 08:41 14:15 19:50 Pluto 6 19 21.8 -21 39.3 Sgr 14.3 0.2 3° E 100 33.48 34.46 07:23 12:03 16:42 13 19 22.8 -21 38.0 Sgr 14.3 0.2 4° W 100 33.48 34.47 06:57 11:36 16:16 20 19 23.8 -21 36.6 Sgr 14.3 0.2 10° W 100 33.49 34.46 06:30 11:10 15:49 27 19 24.8 -21 35.2 Sgr 14.3 0.2 17° W 100 33.49 34.43 06:04 10:43 15:23 The Skyscraper January 2018 3 Astronomical Highlights for 2018 by Dave Huestis Last year on January 1 we were anx- may still catch a bright meteor or two.
Load more

Recommended publications
  • Astronomy Magazine Special Issue
    γ ι ζ γ δ α κ β κ ε γ β ρ ε ζ υ α φ ψ ω χ α π χ φ γ ω ο ι δ κ α ξ υ λ τ μ β α σ θ ε β σ δ γ ψ λ ω σ η ν θ Aι must-have for all stargazers η δ μ NEW EDITION! ζ λ β ε η κ NGC 6664 NGC 6539 ε τ μ NGC 6712 α υ δ ζ M26 ν NGC 6649 ψ Struve 2325 ζ ξ ATLAS χ α NGC 6604 ξ ο ν ν SCUTUM M16 of the γ SERP β NGC 6605 γ V450 ξ η υ η NGC 6645 M17 φ θ M18 ζ ρ ρ1 π Barnard 92 ο χ σ M25 M24 STARS M23 ν β κ All-in-one introduction ALL NEW MAPS WITH: to the night sky 42,000 more stars (87,000 plotted down to magnitude 8.5) AND 150+ more deep-sky objects (more than 1,200 total) The Eagle Nebula (M16) combines a dark nebula and a star cluster. In 100+ this intense region of star formation, “pillars” form at the boundaries spectacular between hot and cold gas. You’ll find this object on Map 14, a celestial portion of which lies above. photos PLUS: How to observe star clusters, nebulae, and galaxies AS2-CV0610.indd 1 6/10/10 4:17 PM NEW EDITION! AtlAs Tour the night sky of the The staff of Astronomy magazine decided to This atlas presents produce its first star atlas in 2006.
    [Show full text]
  • Galactic Extinction Laws: II. Hidden in Plain Sight, a New Interstellar Absorption Band at 7700 Å Broader Than Any Known DIB
    MNRAS 000,1–17 (2020) Preprint 4 August 2020 Compiled using MNRAS LATEX style file v3.0 Galactic extinction laws: II. Hidden in plain sight, a new interstellar absorption band at 7700 Å broader than any known DIB J. Maíz Apellániz,1? R. H. Barbá,2 J. A. Caballero,1 R. C. Bohlin3; and C. Fariña4;5 1Centro de Astrobiología. CSIC-INTA. Campus ESAC. Camino bajo del castillo s/n. E-28 692 Villanueva de la Cañada. Madrid. Spain. 2Departamento de Astronomía. Universidad de La Serena. Av. Cisternas 1200 Norte. La Serena. Chile. 3Space Telescope Science Institute. 3700 San Martin Drive. Baltimore, MD 21 218, U.S.A. 4Instituto de Astrofísica de Canarias. E-38 200 La Laguna, Tenerife, Spain. 5Isaac Newton Group of Telescopes. Apartado de correos 321. E-38 700 Santa Cruz de La Palma, La Palma, Spain. Accepted 2020 August 3. Received 2020 August 3; in original form 2020 June 4. ABSTRACT We have detected a broad interstellar absorption band centred close to 7700 Å and with a FWHM of 176.6±3.9 Å. This is the first such absorption band detected in the optical range and is significantly wider than the numerous diffuse interstellar bands (DIBs). It remained undiscovered until now because it is partially hidden behind the A telluric band produced by O2. The band was discovered using STIS@HST spectra and later detected in a large sample of stars of diverse type (OB stars, BA supergiants, red giants) using further STIS and ground- based spectroscopy. The EW of the band is measured and compared with our extinction and K i λλ7667.021,7701.093 measurements for the same sample.
    [Show full text]
  • List of Bright Nebulae Primary I.D. Alternate I.D. Nickname
    List of Bright Nebulae Alternate Primary I.D. Nickname I.D. NGC 281 IC 1590 Pac Man Neb LBN 619 Sh 2-183 IC 59, IC 63 Sh2-285 Gamma Cas Nebula Sh 2-185 NGC 896 LBN 645 IC 1795, IC 1805 Melotte 15 Heart Nebula IC 848 Soul Nebula/Baby Nebula vdB14 BD+59 660 NGC 1333 Embryo Neb vdB15 BD+58 607 GK-N1901 MCG+7-8-22 Nova Persei 1901 DG 19 IC 348 LBN 758 vdB 20 Electra Neb. vdB21 BD+23 516 Maia Nebula vdB22 BD+23 522 Merope Neb. vdB23 BD+23 541 Alcyone Neb. IC 353 NGC 1499 California Nebula NGC 1491 Fossil Footprint Neb IC 360 LBN 786 NGC 1554-55 Hind’s Nebula -Struve’s Lost Nebula LBN 896 Sh 2-210 NGC 1579 Northern Trifid Nebula NGC 1624 G156.2+05.7 G160.9+02.6 IC 2118 Witch Head Nebula LBN 991 LBN 945 IC 405 Caldwell 31 Flaming Star Nebula NGC 1931 LBN 1001 NGC 1952 M 1 Crab Nebula Sh 2-264 Lambda Orionis N NGC 1973, 1975, Running Man Nebula 1977 NGC 1976, 1982 M 42, M 43 Orion Nebula NGC 1990 Epsilon Orionis Neb NGC 1999 Rubber Stamp Neb NGC 2070 Caldwell 103 Tarantula Nebula Sh2-240 Simeis 147 IC 425 IC 434 Horsehead Nebula (surrounds dark nebula) Sh 2-218 LBN 962 NGC 2023-24 Flame Nebula LBN 1010 NGC 2068, 2071 M 78 SH 2 276 Barnard’s Loop NGC 2149 NGC 2174 Monkey Head Nebula IC 2162 Ced 72 IC 443 LBN 844 Jellyfish Nebula Sh2-249 IC 2169 Ced 78 NGC Caldwell 49 Rosette Nebula 2237,38,39,2246 LBN 943 Sh 2-280 SNR205.6- G205.5+00.5 Monoceros Nebula 00.1 NGC 2261 Caldwell 46 Hubble’s Var.
    [Show full text]
  • Atlas Menor Was Objects to Slowly Change Over Time
    C h a r t Atlas Charts s O b by j Objects e c t Constellation s Objects by Number 64 Objects by Type 71 Objects by Name 76 Messier Objects 78 Caldwell Objects 81 Orion & Stars by Name 84 Lepus, circa , Brightest Stars 86 1720 , Closest Stars 87 Mythology 88 Bimonthly Sky Charts 92 Meteor Showers 105 Sun, Moon and Planets 106 Observing Considerations 113 Expanded Glossary 115 Th e 88 Constellations, plus 126 Chart Reference BACK PAGE Introduction he night sky was charted by western civilization a few thou - N 1,370 deep sky objects and 360 double stars (two stars—one sands years ago to bring order to the random splatter of stars, often orbits the other) plotted with observing information for T and in the hopes, as a piece of the puzzle, to help “understand” every object. the forces of nature. The stars and their constellations were imbued with N Inclusion of many “famous” celestial objects, even though the beliefs of those times, which have become mythology. they are beyond the reach of a 6 to 8-inch diameter telescope. The oldest known celestial atlas is in the book, Almagest , by N Expanded glossary to define and/or explain terms and Claudius Ptolemy, a Greco-Egyptian with Roman citizenship who lived concepts. in Alexandria from 90 to 160 AD. The Almagest is the earliest surviving astronomical treatise—a 600-page tome. The star charts are in tabular N Black stars on a white background, a preferred format for star form, by constellation, and the locations of the stars are described by charts.
    [Show full text]
  • MONTHLY OBSERVER's CHALLENGE Las Vegas
    MONTHLY OBSERVER’S CHALLENGE Las Vegas Astronomical Society Compiled by: Roger Ivester, Boiling Springs, North Carolina & Fred Rayworth, Las Vegas, Nevada With special assistance from: Rob Lambert, Alabama JANUARY 2018 NGC-1624/SH2-212 Cluster/Nebula In Perseus “Sharing Observations and Bringing Amateur Astronomers Together” Introduction The purpose of the Observer’s Challenge is to encourage the pursuit of visual observing. It’s open to everyone that’s interested, and if you’re able to contribute notes, and/or drawings, we’ll be happy to include them in our monthly summary. We also accept digital imaging. Visual astronomy depends on what’s seen through the eyepiece. Not only does it satisfy an innate curiosity, but it allows the visual observer to discover the beauty and the wonderment of the night sky. Before photography, all observations depended on what the astronomer saw in the eyepiece, and how they recorded their observations. This was done through notes and drawings, and that’s the tradition we’re stressing in the Observers Challenge. We’re not excluding those with an interest in astrophotography, either. Your images and notes are just as welcome. The hope is that you’ll read through these reports and become inspired to take more time at the eyepiece, study each object, and look for those subtle details that you might never have noticed before. NGC-1624/SH2-212 Cluster/Nebula In Perseus NGC-1624, also known as Collinder 53, is an open cluster located inside an emission nebula, SH2-212, located in the constellation of Perseus. It was discovered by William Herschel in 1790, yet strangely enough, it never made his list of 2,500 objects or obtained a Herschel numbered designation.
    [Show full text]
  • Making a Sky Atlas
    Appendix A Making a Sky Atlas Although a number of very advanced sky atlases are now available in print, none is likely to be ideal for any given task. Published atlases will probably have too few or too many guide stars, too few or too many deep-sky objects plotted in them, wrong- size charts, etc. I found that with MegaStar I could design and make, specifically for my survey, a “just right” personalized atlas. My atlas consists of 108 charts, each about twenty square degrees in size, with guide stars down to magnitude 8.9. I used only the northernmost 78 charts, since I observed the sky only down to –35°. On the charts I plotted only the objects I wanted to observe. In addition I made enlargements of small, overcrowded areas (“quad charts”) as well as separate large-scale charts for the Virgo Galaxy Cluster, the latter with guide stars down to magnitude 11.4. I put the charts in plastic sheet protectors in a three-ring binder, taking them out and plac- ing them on my telescope mount’s clipboard as needed. To find an object I would use the 35 mm finder (except in the Virgo Cluster, where I used the 60 mm as the finder) to point the ensemble of telescopes at the indicated spot among the guide stars. If the object was not seen in the 35 mm, as it usually was not, I would then look in the larger telescopes. If the object was not immediately visible even in the primary telescope – a not uncommon occur- rence due to inexact initial pointing – I would then scan around for it.
    [Show full text]
  • Explorethe Impact That Killed the Dinosaursp. 26
    EXPLORE the impact that killed the dinosaurs p. 26 DECEMBER 2016 The world’s best-selling astronomy magazine Understanding cannibal star systems p. 20 How moon dust will put a ring around Mars p. 46 Discover colorful star clusters p. 32 www.Astronomy.com AND MORE BONUS Vol. 44 Astronomy on Tap becomes a hit p. 58 ONLINE • CONTENT Issue 12 Meet the master of stellar vistas p. 52 CODE p. 3 iOptron’s new mount tested p. 62 ÛiÃÌÊÊÞÕÀÊiÞiÌ°°° ...and share the dividends for a lifetime. Tele Vue APO refractors earn a high yield of happy owners. 35 years of hand-building scopes with care and dedication is why we see comments like: “Thanks to all at Tele Vue for such wonderful products.” The care that goes into building every Tele Vue telescope is evident from the first time you focus an image. What goes unseen are the hours of work that led to that moment. Hand-fitted rack & pinion focusers must withstand 10lb. deflection testing along their travel, yet operate buttery-smooth, without gear lash or image TV-60 shift. Optics are fitted, spaced, and aligned using proprietary techniques to form breathtaking low-power views, spectacular high-power planetary performance, or stunning wide-field images. When you purchase a TV-76 Tele Vue telescope you’re not so much buying a telescope as acquiring a lifetime observing companion. Comments from recent warranty cards UÊ­/6Èä®ÊºÊV>ÌÊÌ >ÊÞÕÊiÕ} ÊvÀÊ«ÀÛ`}ÊiÊÜÌ ÊÃÕV ʵÕ>ÌÞtÊ/ ÃÊÃV«iÊÜÊ}ÛiÊiÊ>Êlifetime TV-85 of observing happiness.” —M.E.,Canada U­/6ÇȮʺ½ÛiÊÜ>Ìi`Ê>Ê/6ÊÃV«iÊvÀÊ{äÊÞi>ÀðÊ>ÞtÊ`]ʽÊÛiÀÜ ii`tÊLove, Love, Love Ìtt»p °°]" U­/6nx®ÊºPerfect form, perfect function, perfectÊÌiiÃV«i]Ê>`ÊÊ``½ÌÊ >ÛiÊÌÊÜ>ÌÊxÊÞi>ÀÃÊÌÊ}iÌÊÌt»p,° °]/8 U­/6nx®Êº/ >ÊÞÕÊvÀÊ>}ÊÃÕV Êbeautiful equipment available.
    [Show full text]
  • Canada-France-Hawaii Telescope 12Th Users' Meeting Montréal, Canada 19 - 22 May 2019
    Canada-France- Hawaii Telescope CFHT IN THE 2020S A TIME OF 12th Users' RESEARCH, EXCELLENCE AND Meeting TRANSFORMATION Montréal, Canada 19 - 22 May 2019 Canada-France-Hawaii Telescope 12th Users' Meeting Montréal, Canada 19 - 22 May 2019 This meeting has been made possible thanks to: Merci! Page 1 of 46 Canada-France-Hawaii Telescope 12th Users' Meeting Montréal, Canada 19 - 22 May 2019 CFHT’s triennial Users’ Meetings are important opportunities for our community to share recent discoveries and perspectives that help guide CFHT’s future. The range of possible futures for CFHT has perhaps never been more diverse as we explore opportunities that will substantially define CFHT’s legacy in 21st century astronomy. Near term, CFHT’s future remains rooted in innovative operations enabling world-class surveys and PI research. Longer term, with the rapid advancement of the Maunakea Spectroscopic Explorer (MSE), CFHT is poised to make a quantum leap in its mission, becoming a truly pivotal research facility in modern astronomy. Balancing these options as we develop a strategy forward remains one of today’s challenges and will be an important topic of discussion at the Users’ Meeting. All of these possibilities are ultimately grounded in the research capabilities CFHT’s community has developed to date. These include a suite of 5 instruments that collectively enable wide field imaging and high resolution spectroscopy and spectropolarimetry at optical and infrared wavelengths, and spectro-imaging from UV to ~1 µm. Large Programs are now the focus of >50% of the observing time at CFHT and annual publication rates have never been higher, exceeding 200 papers per year.
    [Show full text]
  • Survey of Emission Line Stars in Young Open Clusters
    SurveySurvey ofof emissionemission lineline starsstars inin youngyoung openopen clustersclusters AnnapurniAnnapurni SubramaniamSubramaniam Collaborators: Blesson Mathew & B.C. Bhatt EmissionEmission lineline stars:stars: whatwhat areare they?they? These stars show H-alpha emission lines in their spectra – indication of circum-stellar material. Two classes: (1) remnant of the accretion disk – pre-Main sequence stars – Herbig Ae/Be stars (2) Classical Be stars – material thrown out of the star forming a disk. These stars are well studied in the field – not in clusters - uncertainty in estimating their distance, interstellar reddening, age, mass and evolutionary state. ClusterCluster stars:stars: advantageadvantage TheseThese starsstars locatedlocated inin clustersclusters helphelp toto estimateestimate theirtheir propertiesproperties accuratelyaccurately –– distance,distance, reddening,reddening, massmass (spectral(spectral type)type) andand age.age. ToTo studystudy thethe emissionemission phenomenonphenomenon asas aa functionfunction ofof stellarstellar propertiesproperties –– possiblepossible inin thethe casecase ofof clustersclusters stars.stars. PropertiesProperties ofof thethe circumcircum--stellarstellar diskdisk cancan bebe studiedstudied asas aa functionfunction ofof massmass andand age.age. LargeLarge numbernumber ofof starsstars cancan bebe identifiedidentified toto havehave aa largelarge sample,sample, willwill helphelp toto studystudy andand classifyclassify themthem intointo variousvarious groups.groups. DataData Aim:
    [Show full text]
  • Reflectionsreflections the Newsletter of the Popular Astronomy Club ESTABLISHED 1936 February 2021
    Affiliated with ReflectionsReflections The Newsletter of the Popular Astronomy Club ESTABLISHED 1936 February 2021 President’s Corner February 2021 the speed of light, this means the object is Welcome to the Febru- trapped in the black hole. ary edition of Reflec- The escape velocity for a planet is the speed at tions. We are in the which an object (like a rocket) would have to middle of winter, which be launched from the surface of the planet so should be obvious to that it would fly up and completely escape Page Topic everyone and especially from the planet and never fall back down for astronomers. We again. A rocket could orbit a planet at a slightly 1-2 Presidents have had very few op- slower speed and never fall back to the Corner Alan Sheidler portunities to view ce- planet’s surface, but in that case, the rocket 2-4 Announcements lestial objects and when would not have escaped, it would have been 5-10 Contributions we have, it has been too cold or snowy for trapped in an orbit around the planet. 11 Astronomy in most of us to get out under the stars. Print We can calculate the escape velocity for the For many of us, this is a time when we take a 12-13 Skyward Earth and other solar system objects using the vacation from observing and do other things 14 Upcoming Events fairly simple equation below. For those of you (like buy new telescopes or plan observing 15 Sign-Up Sheet not wanting to bother doing the math, I creat- sessions when the weather improves this 16 Astronomical ed the following table showing the escape ve- spring).
    [Show full text]
  • List of Publications
    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 (1955−2012) ABBREVIATIONS ASR: Advances in Space Research AG: Advances in Geosciences AA: Astronomy and Astrophysics AASS: Astronomy and Astrophysics Supplement Series ACTA: Acta Astronomica AAQR: Aerosol and Air Quality Research AJ: Astronomical Journal AR: Astronomy Reports ANG: Annals de Geophysique Ap. B.: Astrophysical Bulletin Ap. J.: Astrophysical Journal ASP: Astronomical Society of Pacific ASR: Advances in Space Research ASS: Astrophysics and Space Science AE: Atmospheric Environment AR: Atmospheric Research ASL: Atmospheric Science Letters BA: Baltic Astronomy BAC: Bulletin Astronomical Institute of Czechoslovakia BAJ: Bulgarian Astronomical Journal 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 IJRS: International Journal of Remote Sensing 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 IJMP-D: International Journal of Modern Physics D JAA: Journal of Astrophysics and
    [Show full text]
  • Arxiv:1312.6222V1
    The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars1 A. Sota2,3,4 J. Ma´ızApell´aniz2,3,4,5 Instituto de Astrof´ısica de Andaluc´ıa-CSIC, Glorieta de la Astronom´ıa s/n, 18008 Granada, Spain N. I. Morrell Las Campanas Observatory, Observatories of the Carnegie Institution of Washington, La Serena, Chile R. H. Barb´a2 Departamento de F´ısica, Universidad de La Serena, Av. Cisternas 1200 Norte, La Serena, Chile N. R. Walborn Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA R. C. Gamen Instituto de Astrof´ısica de La Plata (CCT La Plata-CONICET, Universidad Nacional de La Plata), Paseo del Bosque s/n, 1900 La Plata, Argentina J. I. Arias Departamento de F´ısica, Universidad de La Serena, Av. Cisternas 1200 Norte, La Serena, Chile E. J. Alfaro Instituto de Astrof´ısica de Andaluc´ıa-CSIC, Glorieta de la Astronom´ıa s/n, 18008 Granada, Spain arXiv:1312.6222v1 [astro-ph.GA] 21 Dec 2013 ABSTRACT We present the second installment of GOSSS, a massive spectroscopic survey of Galactic O stars, based on new homogeneous, high signal-to-noise ratio, R ∼ 2500 digital observations from both hemispheres selected from the Galactic O-Star Catalog (GOSC). In this paper we include bright stars and other objects drawn mostly from the first version of GOSC, all of them south of δ = −20◦, for a total number of 258 O stars. We also revise the northern sample of paper I to provide the full list of spectroscopically classified Galactic O stars complete to B = 8, bringing the total number of published GOSSS stars to 448.
    [Show full text]