JRASC, August 2005 Issue (PDF)
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Disertaciones Astronómicas Boletín Número 55 De Efemérides Astronómicas 28 De Octubre De 2020
Disertaciones astronómicas Boletín Número 55 de efemérides astronómicas 28 de octubre de 2020 Realiza Luis Fernando Ocampo O. ([email protected]). Noticias de la semana. Osiris–Rex y el astroide Bennu. Imagen 1: Estas imágenes muestran los cuatro sitios de recolección de muestras candidatos en el asteroide Bennu: Nightingale, Kingfisher, Osprey y Sandpiper. Imagen: NASA / / Goddard / Universidad de Arizona. La misión OSIRIS-REx de la NASA está realizó un almacenamiento temprano el martes 27 de octubre de la gran muestra que recolectó la semana pasada de la superficie del asteroide Bennu para proteger y devolver la mayor cantidad posible de muestra. Su capacidad es hasta 2 kg. El 22 de octubre, el equipo de la misión OSIRIS-REx recibió imágenes que mostraban que la cabeza recolectora de la nave espacial rebosaba de material recolectado de la superficie de Bennu, muy por encima del requisito de la misión de dos onzas (60 gramos), y que algunas de estas partículas parecían estar escapar lentamente del cabezal de recolección, llamado Mecanismo de adquisición de muestras Touch-And-Go (TAGSAM). Una solapa de mylar en el TAGSAM permite que el material entre fácilmente en el cabezal del colector y debe sellar para cerrar una vez que las partículas pasan. Sin embargo, las rocas más grandes que no pasaron completamente a través de la solapa hacia el TAGSAM parecen haber abierto esta solapa, lo que permitió que se filtraran fragmentos de la muestra. Debido a que el primer evento de recolección de muestras fue tan exitoso, la Dirección de Misiones Científicas de la NASA le ha dado al equipo de la misión el visto bueno para acelerar el almacenamiento de muestras, originalmente programado para el 2 de noviembre, en la Cápsula de Retorno de Muestras (SRC) de la nave espacial para minimizar una mayor pérdida de muestras. -
Journal Reprints-Astronomy/Download/8526
SPACE PATTERNS AND PAINTINGS (published in the "Engineer" magazine No. 8-9, 2012) Sagredo. - If the end of the pen, which was on the ship during my entire voyage from Venice to Alexandretta, were able to leave a visible trace of its entire path, then what kind of trace, what mark, what line would it leave? Simplicio. - I would leave a line stretching from Venice to the final place, not completely straight, or rather, extended in the form of an arc of a circle, but more or less wavy, depending on how much the ship swayed along the way ... Sagredo. - If, therefore, the artist, upon leaving the harbor, began to draw with this pen on a sheet of paper and continued drawing until Alexandretta, he could get from his movement a whole picture of figures ... at least a trace left ... by the end of the pen would be nothing more than a very long and simple line. G. Galileo "Dialogue on the two main systems of the world" Space has been giving astronomers surprise after surprise lately. A number of mysterious space objects were discovered that were not predicted by astrophysics and contradicted it. The more advanced observation methods become, the more such surprises. At one time, I. Shklovsky argued that the discovery of such "cosmic wonders" would confirm the reality of extraterrestrial intelligence, its enormous technical capabilities. But in reality, the "cosmic miracles" showed the backwardness of terrestrial science, which the opium of relativism smiled so much that now it cannot clearly explain ordinary cosmic phenomena caused by natural causes. -
10. Scientific Programme 10.1
10. SCIENTIFIC PROGRAMME 10.1. OVERVIEW (a) Invited Discourses Plenary Hall B 18:00-19:30 ID1 “The Zoo of Galaxies” Karen Masters, University of Portsmouth, UK Monday, 20 August ID2 “Supernovae, the Accelerating Cosmos, and Dark Energy” Brian Schmidt, ANU, Australia Wednesday, 22 August ID3 “The Herschel View of Star Formation” Philippe André, CEA Saclay, France Wednesday, 29 August ID4 “Past, Present and Future of Chinese Astronomy” Cheng Fang, Nanjing University, China Nanjing Thursday, 30 August (b) Plenary Symposium Review Talks Plenary Hall B (B) 8:30-10:00 Or Rooms 309A+B (3) IAUS 288 Astrophysics from Antarctica John Storey (3) Mon. 20 IAUS 289 The Cosmic Distance Scale: Past, Present and Future Wendy Freedman (3) Mon. 27 IAUS 290 Probing General Relativity using Accreting Black Holes Andy Fabian (B) Wed. 22 IAUS 291 Pulsars are Cool – seriously Scott Ransom (3) Thu. 23 Magnetars: neutron stars with magnetic storms Nanda Rea (3) Thu. 23 Probing Gravitation with Pulsars Michael Kremer (3) Thu. 23 IAUS 292 From Gas to Stars over Cosmic Time Mordacai-Mark Mac Low (B) Tue. 21 IAUS 293 The Kepler Mission: NASA’s ExoEarth Census Natalie Batalha (3) Tue. 28 IAUS 294 The Origin and Evolution of Cosmic Magnetism Bryan Gaensler (B) Wed. 29 IAUS 295 Black Holes in Galaxies John Kormendy (B) Thu. 30 (c) Symposia - Week 1 IAUS 288 Astrophysics from Antartica IAUS 290 Accretion on all scales IAUS 291 Neutron Stars and Pulsars IAUS 292 Molecular gas, Dust, and Star Formation in Galaxies (d) Symposia –Week 2 IAUS 289 Advancing the Physics of Cosmic -
Executive Summary
The Boston University Astronomy Department Annual Report 2010 Chair: James Jackson Administrator: Laura Wipf 1 2 TABLE OF CONTENTS Executive Summary 5 Faculty and Staff 5 Teaching 6 Undergraduate Programs 6 Observatory and Facilities 8 Graduate Program 9 Colloquium Series 10 Alumni Affairs/Public Outreach 10 Research 11 Funding 12 Future Plans/Departmental Needs 13 APPENDIX A: Faculty, Staff, and Graduate Students 16 APPENDIX B: 2009/2010 Astronomy Graduates 18 APPENDIX C: Seminar Series 19 APPENDIX D: Sponsored Project Funding 21 APPENDIX E: Accounts Income Expenditures 25 APPENDIX F: Publications 27 Cover photo: An ultraviolet image of Saturn taken by Prof. John Clarke and his group using the Hubble Space Telescope. The oval ribbons toward the top and bottom of the image shows the location of auroral activity near Saturn’s poles. This activity is analogous to Earth’s aurora borealis and aurora australis, the so-called “northern” and “southern lights,” and is caused by energetic particles from the sun trapped in Saturn’s magnetic field. 3 4 EXECUTIVE SUMMARY associates authored or co-authored a total of 204 refereed, scholarly papers in the disciplines’ most The Department of Astronomy teaches science to prestigious journals. hundreds of non-science majors from throughout the university, and runs one of the largest astronomy degree The funding of the Astronomy Department, the Center programs in the country. Research within the for Space Physics, and the Institute for Astrophysical Astronomy Department is thriving, and we retain our Research was changed this past year. In previous years, strong commitment to teaching and service. only the research centers received research funding, but last year the Department received a portion of this The Department graduated a class of twelve research funding based on grant activity by its faculty. -
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 -
Information Bulletin on Variable Stars
COMMISSIONS AND OF THE I A U INFORMATION BULLETIN ON VARIABLE STARS Nos November July EDITORS L SZABADOS K OLAH TECHNICAL EDITOR A HOLL TYPESETTING K ORI ADMINISTRATION Zs KOVARI EDITORIAL BOARD L A BALONA M BREGER E BUDDING M deGROOT E GUINAN D S HALL P HARMANEC M JERZYKIEWICZ K C LEUNG M RODONO N N SAMUS J SMAK C STERKEN Chair H BUDAPEST XI I Box HUNGARY URL httpwwwkonkolyhuIBVSIBVShtml HU ISSN COPYRIGHT NOTICE IBVS is published on b ehalf of the th and nd Commissions of the IAU by the Konkoly Observatory Budap est Hungary Individual issues could b e downloaded for scientic and educational purp oses free of charge Bibliographic information of the recent issues could b e entered to indexing sys tems No IBVS issues may b e stored in a public retrieval system in any form or by any means electronic or otherwise without the prior written p ermission of the publishers Prior written p ermission of the publishers is required for entering IBVS issues to an electronic indexing or bibliographic system to o CONTENTS C STERKEN A JONES B VOS I ZEGELAAR AM van GENDEREN M de GROOT On the Cyclicity of the S Dor Phases in AG Carinae ::::::::::::::::::::::::::::::::::::::::::::::::::: : J BOROVICKA L SAROUNOVA The Period and Lightcurve of NSV ::::::::::::::::::::::::::::::::::::::::::::::::::: :::::::::::::: W LILLER AF JONES A New Very Long Period Variable Star in Norma ::::::::::::::::::::::::::::::::::::::::::::::::::: :::::::::::::::: EA KARITSKAYA VP GORANSKIJ Unusual Fading of V Cygni Cyg X in Early November ::::::::::::::::::::::::::::::::::::::: -
Variable Star Classification and Light Curves Manual
Variable Star Classification and Light Curves An AAVSO course for the Carolyn Hurless Online Institute for Continuing Education in Astronomy (CHOICE) This is copyrighted material meant only for official enrollees in this online course. Do not share this document with others. Please do not quote from it without prior permission from the AAVSO. Table of Contents Course Description and Requirements for Completion Chapter One- 1. Introduction . What are variable stars? . The first known variable stars 2. Variable Star Names . Constellation names . Greek letters (Bayer letters) . GCVS naming scheme . Other naming conventions . Naming variable star types 3. The Main Types of variability Extrinsic . Eclipsing . Rotating . Microlensing Intrinsic . Pulsating . Eruptive . Cataclysmic . X-Ray 4. The Variability Tree Chapter Two- 1. Rotating Variables . The Sun . BY Dra stars . RS CVn stars . Rotating ellipsoidal variables 2. Eclipsing Variables . EA . EB . EW . EP . Roche Lobes 1 Chapter Three- 1. Pulsating Variables . Classical Cepheids . Type II Cepheids . RV Tau stars . Delta Sct stars . RR Lyr stars . Miras . Semi-regular stars 2. Eruptive Variables . Young Stellar Objects . T Tau stars . FUOrs . EXOrs . UXOrs . UV Cet stars . Gamma Cas stars . S Dor stars . R CrB stars Chapter Four- 1. Cataclysmic Variables . Dwarf Novae . Novae . Recurrent Novae . Magnetic CVs . Symbiotic Variables . Supernovae 2. Other Variables . Gamma-Ray Bursters . Active Galactic Nuclei 2 Course Description and Requirements for Completion This course is an overview of the types of variable stars most commonly observed by AAVSO observers. We discuss the physical processes behind what makes each type variable and how this is demonstrated in their light curves. Variable star names and nomenclature are placed in a historical context to aid in understanding today’s classification scheme. -
Dust and Molecular Shells in Asymptotic Giant Branch Stars⋆⋆⋆⋆⋆⋆
A&A 545, A56 (2012) Astronomy DOI: 10.1051/0004-6361/201118150 & c ESO 2012 Astrophysics Dust and molecular shells in asymptotic giant branch stars,, Mid-infrared interferometric observations of R Aquilae, R Aquarii, R Hydrae, W Hydrae, and V Hydrae R. Zhao-Geisler1,2,†, A. Quirrenbach1, R. Köhler1,3, and B. Lopez4 1 Zentrum für Astronomie der Universität Heidelberg (ZAH), Landessternwarte, Königstuhl 12, 69120 Heidelberg, Germany e-mail: [email protected] 2 National Taiwan Normal University, Department of Earth Sciences, 88 Sec. 4, Ting-Chou Rd, Wenshan District, Taipei, 11677 Taiwan, ROC 3 Max-Planck-Institut für Astronomie, Königstuhl 17, 69120 Heidelberg, Germany 4 Laboratoire J.-L. Lagrange, Université de Nice Sophia-Antipolis et Observatoire de la Cˆote d’Azur, BP 4229, 06304 Nice Cedex 4, France Received 26 September 2011 / Accepted 21 June 2012 ABSTRACT Context. Asymptotic giant branch (AGB) stars are one of the largest distributors of dust into the interstellar medium. However, the wind formation mechanism and dust condensation sequence leading to the observed high mass-loss rates have not yet been constrained well observationally, in particular for oxygen-rich AGB stars. Aims. The immediate objective in this work is to identify molecules and dust species which are present in the layers above the photosphere, and which have emission and absorption features in the mid-infrared (IR), causing the diameter to vary across the N-band, and are potentially relevant for the wind formation. Methods. Mid-IR (8–13 μm) interferometric data of four oxygen-rich AGB stars (R Aql, R Aqr, R Hya, and W Hya) and one carbon- rich AGB star (V Hya) were obtained with MIDI/VLTI between April 2007 and September 2009. -
Introduction to Astronomical Photometry, Second Edition
This page intentionally left blank Introduction to Astronomical Photometry, Second Edition Completely updated, this Second Edition gives a broad review of astronomical photometry to provide an understanding of astrophysics from a data-based perspective. It explains the underlying principles of the instruments used, and the applications and inferences derived from measurements. Each chapter has been fully revised to account for the latest developments, including the use of CCDs. Highly illustrated, this book provides an overview and historical background of the subject before reviewing the main themes within astronomical photometry. The central chapters focus on the practical design of the instruments and methodology used. The book concludes by discussing specialized topics in stellar astronomy, concentrating on the information that can be derived from the analysis of the light curves of variable stars and close binary systems. This new edition includes numerous bibliographic notes and a glossary of terms. It is ideal for graduate students, academic researchers and advanced amateurs interested in practical and observational astronomy. Edwin Budding is a research fellow at the Carter Observatory, New Zealand, and a visiting professor at the Çanakkale University, Turkey. Osman Demircan is Director of the Ulupınar Observatory of Çanakkale University, Turkey. Cambridge Observing Handbooks for Research Astronomers Today’s professional astronomers must be able to adapt to use telescopes and interpret data at all wavelengths. This series is designed to provide them with a collection of concise, self-contained handbooks, which covers the basic principles peculiar to observing in a particular spectral region, or to using a special technique or type of instrument. The books can be used as an introduction to the subject and as a handy reference for use at the telescope, or in the office. -
Arxiv:1401.4252V1 [Astro-Ph.EP] 17 Jan 2014
Elemental Compositions of Two Extrasolar Rocky Planetesimals 1 S. Xu(¸rz)a, M. Juraa, D. Koesterb, B. Kleina, B. Zuckermana ABSTRACT We report Keck/HIRES and HST/COS spectroscopic studies of extrasolar rocky planetesimals accreted onto two hydrogen atmosphere white dwarfs, G29- 38 and GD 133. In G29-38, 8 elements are detected, including C, O, Mg, Si, Ca, Ti, Cr and Fe while in GD 133, O, Si, Ca and marginally Mg are seen. These two extrasolar planetesimals show a pattern of refractory enhancement and volatile depletion. For G29-38, the observed composition can be best interpreted as a blend of a chondritic object with some refractory-rich material, a result from post-nebular processing. Water is very depleted in the parent body accreted onto G29-38, based on the derived oxygen abundance. The inferred total mass accretion rate in GD 133 is the lowest of all known dusty white dwarfs, possibly due to non-steady state accretion. We continue to find that a variety of extrasolar planetesimals all resemble to zeroth order the elemental composition of bulk Earth. Subject headings: planetary systems { stars: abundances { white dwarfs 1. Introduction Based upon models of planet formation, we understand the variety of elemental compo- sitions of planetesimals as a familiar three step process (McSween & Huss 2010). (i) Under arXiv:1401.4252v1 [astro-ph.EP] 17 Jan 2014 aDepartment of Physics and Astronomy, University of California, Los Angeles CA 90095-1562; [email protected], [email protected], [email protected], [email protected] bInstitut fur Theoretische Physik und Astrophysik, University of Kiel, 24098 Kiel, Germany; [email protected] 1Some of the data presented herein were obtained at the W.M. -
GEORGE HERBIG and Early Stellar Evolution
GEORGE HERBIG and Early Stellar Evolution Bo Reipurth Institute for Astronomy Special Publications No. 1 George Herbig in 1960 —————————————————————– GEORGE HERBIG and Early Stellar Evolution —————————————————————– Bo Reipurth Institute for Astronomy University of Hawaii at Manoa 640 North Aohoku Place Hilo, HI 96720 USA . Dedicated to Hannelore Herbig c 2016 by Bo Reipurth Version 1.0 – April 19, 2016 Cover Image: The HH 24 complex in the Lynds 1630 cloud in Orion was discov- ered by Herbig and Kuhi in 1963. This near-infrared HST image shows several collimated Herbig-Haro jets emanating from an embedded multiple system of T Tauri stars. Courtesy Space Telescope Science Institute. This book can be referenced as follows: Reipurth, B. 2016, http://ifa.hawaii.edu/SP1 i FOREWORD I first learned about George Herbig’s work when I was a teenager. I grew up in Denmark in the 1950s, a time when Europe was healing the wounds after the ravages of the Second World War. Already at the age of 7 I had fallen in love with astronomy, but information was very hard to come by in those days, so I scraped together what I could, mainly relying on the local library. At some point I was introduced to the magazine Sky and Telescope, and soon invested my pocket money in a subscription. Every month I would sit at our dining room table with a dictionary and work my way through the latest issue. In one issue I read about Herbig-Haro objects, and I was completely mesmerized that these objects could be signposts of the formation of stars, and I dreamt about some day being able to contribute to this field of study. -
Imaging Extrasolar Giant Planets Brendan P
Publications of the Astronomical Society of the Pacific, 128:102001 (38pp), 2016 October doi:10.1088/1538-3873/128/968/102001 © 2016. The Astronomical Society of the Pacific. All rights reserved. Printed in the U.S.A. Imaging Extrasolar Giant Planets Brendan P. Bowler1 McDonald Observatory and the University of Texas at Austin, Department of Astronomy, 2515 Speedway, Stop C1400, Austin, TX 78712, USA; [email protected] Received 2016 March 18; accepted 2016 May 8; published 2016 August 29 Abstract High-contrast adaptive optics (AO) imaging is a powerful technique to probe the architectures of planetary systems from the outside-in and survey the atmospheres of self-luminous giant planets. Direct imaging has rapidly matured over the past decade and especially the last few years with the advent of high-order AO systems, dedicated planet- finding instruments with specialized coronagraphs, and innovative observing and post-processing strategies to suppress speckle noise. This review summarizes recent progress in high-contrast imaging with particular emphasis on observational results, discoveries near and below the deuterium-burning limit, and a practical overview of large- scale surveys and dedicated instruments. I conclude with a statistical meta-analysis of deep imaging surveys in the literature. Based on observations of 384 unique and single young (≈5–300 Myr) stars spanning stellar masses between 0.1 and 3.0 Me, the overall occurrence rate of 5–13 MJup companions at orbital distances of 30–300 au is +0.7 0.6-0.5 % assuming hot-start evolutionary models. The most massive giant planets regularly accessible to direct imaging are about as rare as hot Jupiters are around Sun-like stars.