Planck Intermediate Results. XXV. the Andromeda Galaxy As Seen by Planck P
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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. -
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. -
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. -
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. -
219Th Meeting of the American Astronomical Society
219TH MEETING OF THE AMERICAN ASTRONOMICAL SOCIETY 8-12 JANUARY 2012 AUSTIN, TX All scientific sessions will be held at the: Austin Convention Center COUNCIL .......................... 2 500 East Cesar Chavez Street Austin, TX 78701-4121 EXHIBITORS ..................... 4 AAS Paper Sorters ATTENDEE SERVICES .......................... 9 Tom Armstrong, Blaise Canzian, Thayne Curry, Shantanu Desai, Aaron Evans, Nimish P. Hathi, SCHEDULE .....................15 Jason Jackiewicz, Sebastien Lepine, Kevin Marvel, Karen Masters, J. Allyn Smith, Joseph Tenn, SATURDAY .....................25 Stephen C. Unwin, Gerritt Vershuur, Joseph C. Weingartner, Lee Anne Willson SUNDAY..........................28 Session Numbering Key MONDAY ........................36 90s Sunday TUESDAY ........................91 100s Monday WEDNESDAY .............. 146 200s Tuesday 300s Wednesday THURSDAY .................. 199 400s Thursday AUTHOR INDEX ........ 251 Sessions are numbered in the Program Book by day and time. Please note, posters are only up for the day listed. Changes after 7 December 2011 are only included in the online program materials. 1 AAS Officers & Councilors President (6/2010-6/2013) Debra Elmegreen Vassar College Vice President (6/2009-6/2012) Lee Anne Willson Iowa State Univ. Vice President (6/2010-6/2013) Nicholas B. Suntzeff Texas A&M Univ. Vice President (6/2011-6/2014) Edward B. Churchwell Univ. of Wisconsin Secretary (6/2010-6/2013) G. Fritz Benedict Univ. of Texas, Austin Treasurer (6/2008-6/2014) Hervey (Peter) Stockman STScI Education Officer (6/2006-6/2012) Timothy F. Slater Univ. of Wyoming Publications Board Chair (6/2011-6/2015) Anne P. Cowley Arizona State Univ. Executive Officer (6/2006-Present) Kevin Marvel AAS Councilors Richard G. French Wellesley College (6/2009-6/2012) James D. -
Period and Amplitude Variability of the High-Amplitude Δ Scuti Star Gp Andromedae
BearWorks College of Natural and Applied Sciences 10-1-2011 Period and amplitude variability of the high-amplitude δ Scuti star gp andromedae A.-Y. Zhou Missouri State University S. Y. Jiang Follow this and additional works at: https://bearworks.missouristate.edu/articles-cnas Recommended Citation Zhou, A-Y., and S-Y. Jiang. "Period and Amplitude Variability of the High-amplitude δ Scuti Star GP Andromedae." The Astronomical Journal 142, no. 4 (2011): 100. This article or document was made available through BearWorks, the institutional repository of Missouri State University. The work contained in it may be protected by copyright and require permission of the copyright holder for reuse or redistribution. For more information, please contact [email protected]. The Astronomical Journal, 142:100 (13pp), 2011 October doi:10.1088/0004-6256/142/4/100 C 2011. The American Astronomical Society. All rights reserved. Printed in the U.S.A. PERIOD AND AMPLITUDE VARIABILITY OF THE HIGH-AMPLITUDE δ SCUTI STAR GP ANDROMEDAE A.-Y. Zhou1 and S.-Y. Jiang National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, 100012 Beijing, China; [email protected] Received 2010 September 22; accepted 2011 July 17; published 2011 August 23 ABSTRACT Extensive differential time-series CCD photometry has been carried out between 2003 and 2009 for the high-amplitude δ Scuti (HADS) star GP And. We acquired 12,583 new measurements consisting of 41 nights (153.3 hr) spanning over 2221 days. This is the largest time-series data set to date for the star. Based upon these data and others available in the literature, a comprehensive analysis has been conducted to investigate the pulsational properties of the star. -
Report from the Exoplanet Task Force
THE UNIVERSITY OF ARIZONA ® TUCSON ARIZONA Department of Planetary Sciences Tucson, Arizona 85721-0092 Lunar and Planetary Laboratory Tel: (520) 621-2789 1629 E. University Blvd. Fax: (520) 626-8250 May 18, 2008 Dr. Garth D. Illingworth Chair, Astronomy and Astrophysics Advisory Committee Department of Astronomy and Astrophysics University of California, Santa Cruz Dear Garth, I am pleased to transmit to you the report of the Exoplanet Task Force. The report is a comprehensive study of the search for and study of planets around other stars (exoplanets). The young but maturing field of exoplanets is perhaps one of the most compelling fields of study in science today—both because of the discoveries made to date on giant planets around other stars, and because the detection of planets just like our Earth (“Earth analogs”) is at last within reach technologically. In the Report we outline the need for a vigorous research program in exoplanets to understand our place in the cosmos: whether planets like our home Earth are a common or rare outcome of cosmic evolution. The strategy we developed is intended to address the following fundamental questions, in priority order, within three distinct 5-yr long phases, over a 15 year period: 1. What are the physical characteristics of planets in the habitable zones around bright, nearby stars? 2. What is the architecture of planetary systems? 3. When, how and in what environments are planets formed? The Report recommends a two-pronged strategy for the detection and characterization of planets the size of the Earth. For stars much less massive and cooler than our Sun (M-dwarfs), existing ground-based techniques including radial velocity and transit searches, and space-based facilities both existing and under development such as Spitzer and JWST, are adequate for finding and studying planets close to the mass and size of the Earth. -
B. SZEIDL, KONKOLY OBSERVATORY 1525 BUDAPEST, Box 67, HUNGARY HU ISSN 0374-0676 CONTENTS
COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Nos. 1701-1800 1979 November - 1980 June EDITOR: B. SZEIDL, KONKOLY OBSERVATORY 1525 BUDAPEST, Box 67, HUNGARY HU ISSN 0374-0676 CONTENTS 1979 No Page 1701 M.K. HART, K. KING, B.R. McNAMARA, R.L. SEAMAN and J. STOKE: Photoelectric Minima of AW UMa and W UMa ............ ... 1 1702 Z. KVIZ: Minima of Southern Eclipsing Variables, 1975-1979 Siding Spring ........ 1-2 1703 M.A. CERRUTI: Light Elements of V 757 Cen ...... 1-3 1704 C.H. LACY and D.S. EVANS: New Eclipsing Binary Results Obtained with a Reticon Detector 1-3 1705 S. HOWELL and R.J. PANEK: Variability of SS433... 1 1706 E.P. BELSERENE: The 1978 Nova in Sgr ........... 1-2 1707 B. WARNER: High Speed Photometry of U Sco ....... 1-2 1708 R.H. KOCH, F.B. WOOD, D.R. FLORKOWSKI and J.P. OLIVER: A Selection of Observationally Attractive Close Binaries ........... 1-4 1709 R.H. KOCH, F.B: WOOD, D.R. FLORKOWSKI and J.P. OLIVER: Photoelectrically-Neglected Eclipsing Binaries .................... 1-3 1710 M. SZTAJNO: Photometric Observations of TT Ari ... 1-4 1711 H.W. DUERBECK, B. LEMKE and E. WILLERDING: Interstellar Lines in the Spectrum of Nova DN Geminorum (1912) ............. 1-3 1712 IL-SEONG NHA and JANG HAE JEONG: Times of Minima of Six Eclipsing Variables ............ 1-2 1713 J.J. CLARIA and R.F. SISTERO: RY Indi: Light Elements ................................ 1-2 1714 B.S. CARTER and M.W. FEAST: The Eruptive Variable in Scorpius: A Symbiotic Star ........ -
Infrared Observations of Exoplanet Atmospheres
University of California Los Angeles Infrared Observations of Exoplanet Atmospheres A dissertation submitted in partial satisfaction of the requirements for the degree Doctor of Philosophy in Astronomy by Ian James Mills Crossfield 2012 c Copyright by Ian James Mills Crossfield 2012 Abstract of the Dissertation Infrared Observations of Exoplanet Atmospheres by Ian James Mills Crossfield Doctor of Philosophy in Astronomy University of California, Los Angeles, 2012 Professor Brad M. S. Hansen, Chair The study of extrasolar planet atmospheres elucidates the formation and mi- gration history of planets and places the origin and evolution of Earth and the Solar System in a broader context. The last several years have seen rapid strides in this direction via routine detections of planetary transits, thermal emission, atmospheric circulation, and transmisission spectroscopy using both broadband photometry and spectroscopy. My dissertation employs all these techniques in an effort to investigate the atmospheric composition, structure, and dynamics of a broad range of exoplanet atmospheres. These observations focus on the infrared wavelengths where planet emission is strongest and molecular features are most prominent. I present transit, eclipse, and phase curve photometry of several hot Jupiters (υ And b, HD 209458b, and WASP-12b), and present spectroscopy for both WASP-12b (emission, observed at low resolution) and the cool, low-mass planet GJ 1214b (transmission at high resolution). This work will guide future observations and inform the next generation of models in preparation for future spectroscopy of ever smaller, cooler, and more Earthlike planets. ii The dissertation of Ian James Mills Crossfield is approved. Ian McLean Jonathan Mitchell Michael Jura Brad M.