Commission 27 of the I.A.U. Information Bulletin On
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
145, September 2010
British Astronomical Association VARIABLE STAR SECTION CIRCULAR No 145, September 2010 Contents EG Andromedae Light Curve ................................................... inside front cover From the Director ............................................................................................... 1 Letter Page. Visual Observing ............................................................................ 4 Epsilon Aurigae Spectroscopically at Mid Eclipse .......................................... 5 Eclipsing Binary News ...................................................................................... 7 AO Cassiopeiae Phase Diagram ............................................................ 9 PV Cephei and Gyulbudaghian’s Nebula ........................................................ 10 WR140 Periastron Campaign Update .............................................................. 12 VSS Meeting, Pendrell Hall. The Central Stars of Planetary Nebulae ............ 14 RR Coronae Borealis 1993-2004 ...................................................................... 16 TU Cassiopeiae Phase Diagram 2005-2010 ..................................................... 18 Binocular Priority List ..................................................................................... 19 Eclipsing Binary Predictions ............................................................................ 20 Charges for Section Publications .............................................. inside back cover Guidelines for Contributing to the Circular ............................. -
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. -
1. Introduction
1. Introduction Three variable stars with short periods and high-amplitude, CY Aqr, BP Peg, and GP And, are selected for the study, and the characteristic of each variable star is analyzed from their light curves. These three variable stars are difference a little, CY Aqr is probability a binary system, BP Peg is a type of delta Scuti star with two stable periods (Rodriguez et al., 1992), and GP And is a simple delta Scuti star. 1.1 Delta Scuti stars Delta Scuti, the fourth bright star in Scutum at V magnitude, 4.71, stand out as the prototype of one of these. On the HR diagram or temperature-luminosity diagram, the kind of variable stars were located in intersects of main sequence with instability strip shown in Figure 1. Figure 1. Delta Scuti stars were in intersects of main sequence with instability strip. Delta Scuti stars is the group of the second most numerous of pulsators in the Galaxy, after the pulsating white dwarfs, and their spectrum belong to type A to early F. Most delta Scuti stars belong to Population I (Antonello, Broglia & Mantegazza, 1986), but a few variables show low metals and 6 high space velocities typical of Population II (Rodriguez E., Rolland A. & Lopez de coca P., 1990). The delta Scuti stars is divided into two types, variable stars with high-amplitude delta Scuti (HADS) and high-amplitude SX Phe (HASXP) (Breger, 1983;Andreasen, 1983;Frolov and Irkaev, 1984). Both of them have asymmetrical light curve in V with amplitudes > 0.25 magnitude and probably hydrogen-burning stars in the main sequence or post main sequence stage. -
FY13 High-Level Deliverables
National Optical Astronomy Observatory Fiscal Year Annual Report for FY 2013 (1 October 2012 – 30 September 2013) Submitted to the National Science Foundation Pursuant to Cooperative Support Agreement No. AST-0950945 13 December 2013 Revised 18 September 2014 Contents NOAO MISSION PROFILE .................................................................................................... 1 1 EXECUTIVE SUMMARY ................................................................................................ 2 2 NOAO ACCOMPLISHMENTS ....................................................................................... 4 2.1 Achievements ..................................................................................................... 4 2.2 Status of Vision and Goals ................................................................................. 5 2.2.1 Status of FY13 High-Level Deliverables ............................................ 5 2.2.2 FY13 Planned vs. Actual Spending and Revenues .............................. 8 2.3 Challenges and Their Impacts ............................................................................ 9 3 SCIENTIFIC ACTIVITIES AND FINDINGS .............................................................. 11 3.1 Cerro Tololo Inter-American Observatory ....................................................... 11 3.2 Kitt Peak National Observatory ....................................................................... 14 3.3 Gemini Observatory ........................................................................................ -
Abstracts of Extreme Solar Systems 4 (Reykjavik, Iceland)
Abstracts of Extreme Solar Systems 4 (Reykjavik, Iceland) American Astronomical Society August, 2019 100 — New Discoveries scope (JWST), as well as other large ground-based and space-based telescopes coming online in the next 100.01 — Review of TESS’s First Year Survey and two decades. Future Plans The status of the TESS mission as it completes its first year of survey operations in July 2019 will bere- George Ricker1 viewed. The opportunities enabled by TESS’s unique 1 Kavli Institute, MIT (Cambridge, Massachusetts, United States) lunar-resonant orbit for an extended mission lasting more than a decade will also be presented. Successfully launched in April 2018, NASA’s Tran- siting Exoplanet Survey Satellite (TESS) is well on its way to discovering thousands of exoplanets in orbit 100.02 — The Gemini Planet Imager Exoplanet Sur- around the brightest stars in the sky. During its ini- vey: Giant Planet and Brown Dwarf Demographics tial two-year survey mission, TESS will monitor more from 10-100 AU than 200,000 bright stars in the solar neighborhood at Eric Nielsen1; Robert De Rosa1; Bruce Macintosh1; a two minute cadence for drops in brightness caused Jason Wang2; Jean-Baptiste Ruffio1; Eugene Chiang3; by planetary transits. This first-ever spaceborne all- Mark Marley4; Didier Saumon5; Dmitry Savransky6; sky transit survey is identifying planets ranging in Daniel Fabrycky7; Quinn Konopacky8; Jennifer size from Earth-sized to gas giants, orbiting a wide Patience9; Vanessa Bailey10 variety of host stars, from cool M dwarfs to hot O/B 1 KIPAC, Stanford University (Stanford, California, United States) giants. 2 Jet Propulsion Laboratory, California Institute of Technology TESS stars are typically 30–100 times brighter than (Pasadena, California, United States) those surveyed by the Kepler satellite; thus, TESS 3 Astronomy, California Institute of Technology (Pasadena, Califor- planets are proving far easier to characterize with nia, United States) follow-up observations than those from prior mis- 4 Astronomy, U.C. -
S.No Reg. No Company Name 1 2 AHMEDABAD MANUFACTURING and CALICO PRINTING CO
LIST OF DEFAULTING COMPANIES IN GUJRAT S.No Reg. No Company_Name 1 2 AHMEDABAD MANUFACTURING AND CALICO PRINTING CO. LTD. 2 3 GUJARAT GINNING & MFG CO.LIMITED. 3 7 THE ARYODAYA SPG & WVG.CO.LIMITED. 4 8 40817HCHOWK & AHMEDABAD MFG CO.LIMITED. 5 9 RAJNAGAR SPG & WVG MFG.CO.LIMITED. 6 10 HMEDABAD COTTON MFG. CO.LIMITED. 7 12 12DISPLAY STATUSSTEEL INDUSTRIES PVT. LTD. 8 18 ISHWER COTTON G.N.& PRES.CO.LIMITED. 9 22 THE AHMEDABAD NEW COTTON MILLS CO.LIMITED. 10 25 BHARAT KHAND TEXTILE MANUFACTURING CO LTD 11 27 HIMABHAI MANUFACTURING CO LTD 12 29 JEHANGIR VAKIL MILLS CO PVT LTD 13 30 GUJARAT OIL MILL & MFG CO LTD 14 31 RUSTOMJI MANGALDAS & COMPANY LTD 15 34 FINE KNITTING CO LTD 16 40 AHMEDABAD LAXMI COTTON MILLS CO.LIMITED. 17 42 AHMEDABAD KAISER-I-HIND MILLS CO LTD 18 45 AHMEDABAD NEW TEXTILE MILS CO LTD 19 47 SHRI VIVEKANAND MILLS LTD 20 49 MARSDEN SPINNING & MANUFACTURING CO LTD 21 50 ASHOKA MILLS LTD. 22 54 AHMEDABAD CYCLE & MOTORS TRADING CO PVT LTD 23 68 SHRI AMRUTA MILLS LTD 24 78 VIJAY MILLS CO LTD 25 79 SHRI ARBUDA MILLS LTD. 26 81 DHARWAR ELECTRICAL INDUSTRIES LTD 27 85 ANANTA MILLS LTD 28 87 BHIKABHAI JIVABHAI & CO PVT LTD 29 89 J R VAKHARIA & SONS PVT LTD 30 99 BIHARI MILLS LIMITED 31 101 ROHIT MILLS LTD 32 106 AHMEDABAD FIBRE-SALES & SUPPLIES LTD 33 107 GUJARAT PAPER MILLS LTD 34 109 IDEAL MOTORS LTD 35 110 MODEL THEATRES PVT LTD 36 115 HIMATLAL MOTILAL & CO LTD.(IN LIQ.) 37 116 RAMANLAL KANAIYALAL & CO LTD.(LIQ). -
1949–1999 the Early Years of Stellar Evolution, Cosmology, and High-Energy Astrophysics
P1: FHN/fkr P2: FHN/fgm QC: FHN/anil T1: FHN September 9, 1999 19:34 Annual Reviews AR088-11 Annu. Rev. Astron. Astrophys. 1999. 37:445–86 Copyright c 1999 by Annual Reviews. All rights reserved THE FIRST 50 YEARS AT PALOMAR: 1949–1999 The Early Years of Stellar Evolution, Cosmology, and High-Energy Astrophysics Allan Sandage The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101 Key Words stellar evolution, observational cosmology, radio astronomy, high energy astrophysics PROLOGUE In 1999 we celebrate the 50th anniversary of the initial bringing into operation of the Palomar 200-inch Hale telescope. When this telescope was dedicated, it opened up a much larger and clearer window on the universe than any telescope that had gone before. Because the Hale telescope has played such an important role in twentieth century astrophysics, we decided to invite one or two of the astronomers most familiar with what has been achieved at Palomar to give a scientific commentary on the work that has been done there in the first fifty years. The first article of this kind which follows is by Allan Sandage, who has been an active member of the staff of what was originally the Mount Wilson and Palomar Observatories, and later the Carnegie Observatories for the whole of these fifty years. The article is devoted to the topics which covered the original goals for the Palomar telescope, namely observational cosmology and the study of galaxies, together with discoveries that were not anticipated, but were first made at Palomar and which played a leading role in the development of high energy astrophysics. -
Planck Intermediate Results. XXV. the Andromeda Galaxy As Seen by Planck P
Planck intermediate results. XXV. The Andromeda Galaxy as seen by Planck P. A. R. Ade, N. Aghanim, M. Arnaud, M. Ashdown, J. Aumont, C. Baccigalupi, A. J. Banday, R. B. Barreiro, N. Bartolo, E. Battaner, et al. To cite this version: P. A. R. Ade, N. Aghanim, M. Arnaud, M. Ashdown, J. Aumont, et al.. Planck intermediate results. XXV. The Andromeda Galaxy as seen by Planck. Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 582, pp.A28. 10.1051/0004-6361/201424643. cea-01383743 HAL Id: cea-01383743 https://hal-cea.archives-ouvertes.fr/cea-01383743 Submitted on 19 Oct 2016 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. A&A 582, A28 (2015) Astronomy DOI: 10.1051/0004-6361/201424643 & c ESO 2015 Astrophysics Planck intermediate results XXV. The Andromeda galaxy as seen by Planck Planck Collaboration: P. A. R. Ade82, N. Aghanim55, M. Arnaud69, M. Ashdown65;6, J. Aumont55, C. Baccigalupi81, A. J. Banday90;10, R. B. Barreiro61, N. Bartolo28;62, E. Battaner91;92, R. Battye64, K. Benabed56;89, G. J. Bendo88, A. Benoit-Lévy22;56;89, J.-P. Bernard90;10, M. Bersanelli31;48, P. -
Download This Issue (Pdf)
Volume 46 Number 1 JAAVSO 2018 The Journal of the American Association of Variable Star Observers Optical Flares and Quasi-Periodic Pulsations on CR Draconis during Periastron Passage Upper panel: 2017-10-10-flare photon counts, time aligned with FFT spectrogram. Lower panel: FFT spectrogram shows time in UT seconds versus QPP periods in seconds. Flares cited by Doyle et al. (2018) are shown with (*). Also in this issue... • The Dwarf Nova SY Cancri and its Environs • KIC 8462852: Maria Mitchell Observatory Photographic Photometry 1922 to 1991 • Visual Times of Maxima for Short Period Pulsating Stars III • Recent Maxima of 86 Short Period Pulsating Stars Complete table of contents inside... The American Association of Variable Star Observers 49 Bay State Road, Cambridge, MA 02138, USA The Journal of the American Association of Variable Star Observers Editor John R. Percy Kosmas Gazeas Kristine Larsen Dunlap Institute of Astronomy University of Athens Department of Geological Sciences, and Astrophysics Athens, Greece Central Connecticut State University, and University of Toronto New Britain, Connecticut Toronto, Ontario, Canada Edward F. Guinan Villanova University Vanessa McBride Associate Editor Villanova, Pennsylvania IAU Office of Astronomy for Development; Elizabeth O. Waagen South African Astronomical Observatory; John B. Hearnshaw and University of Cape Town, South Africa Production Editor University of Canterbury Michael Saladyga Christchurch, New Zealand Ulisse Munari INAF/Astronomical Observatory Laszlo L. Kiss of Padua Editorial Board Konkoly Observatory Asiago, Italy Geoffrey C. Clayton Budapest, Hungary Louisiana State University Nikolaus Vogt Baton Rouge, Louisiana Katrien Kolenberg Universidad de Valparaiso Universities of Antwerp Valparaiso, Chile Zhibin Dai and of Leuven, Belgium Yunnan Observatories and Harvard-Smithsonian Center David B. -
Arxiv:2102.05064V4 [Astro-Ph.EP] 16 Mar 2021
manuscript submitted to JGR: Planets Hot Jupiters: Origins, Structure, Atmospheres Jonathan J. Fortney1, Rebekah I. Dawson2, and Thaddeus D. Komacek3 1Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA, USA 2Department of Astronomy & Astrophysics, Center for Exoplanets and Habitable Worlds, The Pennsylvania State University, University Park, PA, 16802, USA 3Department of the Geophysical Sciences, The University of Chicago, Chicago, IL, 60637, USA Key Points: • The origins of hot Jupiter exoplanets likely involve more than one formation path- way. • Explanations for the anomalously large radii of hot Jupiters need a connection to atmospheric temperature. • Hot Jupiters have complex atmospheres featuring ions, atoms, molecules, and con- densates, where radiation and advection both play significant roles in controlling the 3D temperature structure. arXiv:2102.05064v4 [astro-ph.EP] 16 Mar 2021 Corresponding author: Jonathan J. Fortney, [email protected] {1{ manuscript submitted to JGR: Planets Abstract We provide a brief review of many aspects of the planetary physics of hot Jupiters. Our aim is to cover most of the major areas of current study while providing the reader with additional references for more detailed follow-up. We first discuss giant planet forma- tion and subsequent orbital evolution via disk-driven torques or dynamical interactions. More than one formation pathway is needed to understand the population. Next, we ex- amine our current understanding of the evolutionary history and current interior struc- ture of the planets, where we focus on bulk composition as well as viable models to ex- plain the inflated radii of the population. Finally we discuss aspects of their atmospheres in the context of observations and 1D and 3D models, including atmospheric structure and escape, spectroscopic signatures, and complex atmospheric circulation. -
131, March 2007
British Astronomical Association VARIABLE STAR SECTION CIRCULAR No 131, March 2007 Contents Eclipsing Binary Light Curves ........................................... inside front cover From the Director ......................................................................................... 1 Eclipsing Binary News ................................................................................. 3 Recurrent Objects News ............................................................................... 5 My Favourite Star ........................................................................................ 6 SAO 64632 - A New Variable Star in the Field of U Coronae Borealis ........ 8 HP Lyrae is a Pulsating Star ....................................................................... 16 OJ+287 Update .......................................................................................... 16 IBVS ........................................................................................................... 18 The 2006 Eclipse of V1413 Aquilae ........................................................... 19 CH Cyni Light Curve ................................................................................. 20 Binocular Priority List ................................................................................ 21 Eclipsing Binary Predictions ...................................................................... 22 IRAS 21443+4349 Light Curve .................................................................. 24 Charges for Section Publications -
Joint Meeting of the American Astronomical Society & The
American Association of Physics Teachers Joint Meeting of the American Astronomical Society & Joint Meeting of the American Astronomical Society & the 5-10 January 2007 / Seattle, Washington Final Program FIRST CLASS US POSTAGE PAID PERMIT NO 1725 WASHINGTON DC 2000 Florida Ave., NW Suite 400 Washington, DC 20009-1231 MEETING PROGRAM 2007 AAS/AAPT Joint Meeting 5-10 January 2007 Washington State Convention and Trade Center Seattle, WA IN GRATITUDE .....2 Th e 209th Meeting of the American Astronomical Society and the 2007 FOR FURTHER Winter Meeting of the American INFORMATION ..... 5 Association of Physics Teachers are being held jointly at Washington State PLEASE NOTE ....... 6 Convention and Trade Center, 5-10 January 2007, Seattle, Washington. EXHIBITS .............. 8 Th e AAS Historical Astronomy Divi- MEETING sion and the AAS High Energy Astro- REGISTRATION .. 11 physics Division are also meeting in LOCATION AND conjuction with the AAS/AAPT. LODGING ............ 12 Washington State Convention and FRIDAY ................ 44 Trade Center 7th and Pike Streets SATURDAY .......... 52 Seattle, WA AV EQUIPMENT . 58 SUNDAY ............... 67 AAS MONDAY ........... 144 2000 Florida Ave., NW, Suite 400, Washington, DC 20009-1231 TUESDAY ........... 241 202-328-2010, fax: 202-234-2560, [email protected], www.aas.org WEDNESDAY..... 321 AAPT AUTHOR One Physics Ellipse INDEX ................ 366 College Park, MD 20740-3845 301-209-3300, fax: 301-209-0845 [email protected], www.aapt.org Acknowledgements Acknowledgements IN GRATITUDE AAS Council Sponsors Craig Wheeler U. Texas President (6/2006-6/2008) Ball Aerospace Bob Kirshner CfA Past-President John Wiley and Sons, Inc. (6/2006-6/2007) Wallace Sargent Caltech Vice-President National Academies (6/2004-6/2007) Northrup Grumman Paul Vanden Bout NRAO Vice-President (6/2005-6/2008) PASCO Robert W.