Etoiles Variables)
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
134, December 2007
British Astronomical Association VARIABLE STAR SECTION CIRCULAR No 134, December 2007 Contents AB Andromedae Primary Minima ......................................... inside front cover From the Director ............................................................................................. 1 Recurrent Objects Programme and Long Term Polar Programme News............4 Eclipsing Binary News ..................................................................................... 5 Chart News ...................................................................................................... 7 CE Lyncis ......................................................................................................... 9 New Chart for CE and SV Lyncis ........................................................ 10 SV Lyncis Light Curves 1971-2007 ............................................................... 11 An Introduction to Measuring Variable Stars using a CCD Camera..............13 Cataclysmic Variables-Some Recent Experiences ........................................... 16 The UK Virtual Observatory ......................................................................... 18 A New Infrared Variable in Scutum ................................................................ 22 The Life and Times of Charles Frederick Butterworth, FRAS........................24 A Hard Day’s Night: Day-to-Day Photometry of Vega and Beta Lyrae.........28 Delta Cephei, 2007 ......................................................................................... 33 -
The Observer, November
The OBSERVER The Newsletter of the Twin City Amateur Astronomers, Inc. November 2001 Volume 26, Number 11 Adventures in Meteor Hunting — Duane Yockey In This Issue: REETINGS to my brother and and binoculars just in case the meteors sister sky watchers, didn't live up to their billing. Saturday G was clear here in central Illinois, and • Meteor Hunting Adventures ...1 when I got back from a Duane shows that he has the The long awaited day play at Illinois State right stuff as he tears after the of the Leonid meteor University around Leonids and finds them! shower arrived Satur- 10:30 p.m. the sky was day. I was really still showing lots of • TCAA Calendar ........................1 looking forward to stars. I called Laura Use our calendar to mark going out to the (my oldest daughter), your calendar. observatory with who said the skies were other Twin City clear down in southern • TCAA Annual Holiday Bash....3 Amateur Indiana and I could Party like it’s, um, 2001, at Astronomers and see- drive down there, if the Vic & Cindy’s! ............................ ing the "show" from clouds rolled in (ha, 2:00 a.m. to 6:00 a.m. ha). I assured her that • Club Notes................................4 early Sunday morn- the sky would cooper- Wow, it’s been a busy month! ing. So I packed my ate, and it was looking car early with a lawn good then, and I wished • Software Review: DSE ...........5 chair and threw in my her good luck (if she And just think, if you never telescope, star charts turn to page 5, you’ll never know continued on next page what DSE stands for.. -
Boceto Revista Astronomica
El eclipse de Luna del 15 de abril de 2014 - fotografía por Alejandro Blain Año 86 Número 281 Mayo 2014 Asociación Argentina Amigos de la Astronomía Editorial Telescopio Remoto 4 Hace unas semanas estaba de docente con un grupo de estudiantes Artemio Luis Fava en Quiroga y sin internet cuando me llamó Inés (que había vuelto de CASLEO) para contarme la noticia: un grupo de investigadores había Tierra a la vista... 5 detectado el modo B de polarización… lo que confirmaba las predicciones Iván David Castillo de la teoría inflacionaria del Big Bang. Dicho de otro modo ¡el Big Bang está confirmado! Y por primera vez en mucho tiempo sentí que somos MAVEN - NASA 7 polvo de estrellas. María Agostina Gangemi Si bien mi exclamación no es del todo cierta (más que haberse confirmado el Big Bang, se ha ganado seguridad en el modelo y es posible Damas del cielo 11 explicar hasta más atrás en el tiempo), creo que es el hecho científico más María Marta Do Santos importante que haya ocurrido durante mi vida y agradezco a todos los que ayudaron a poder plasmarlo en esta revista. Contamos con un interesante En el CASLEO de campaña 17 artículo del Dr. Bengochea acompañado de una historieta de PHD Inés Simone Comics de los doctores Jorge Cham y Jon Kaufman (perteneciente al grupo de investigación de BICEP2). No dejen de visitar www.phdcomics. Zoología galáctica 19 com , www.caifa.com.ar ni www.facebook.com/ParalajeCientifico Mgter. Ezequiel Koile Más cerca de nosotros, en el planeta rojo, mientras el Curiosity sigue La inflación cósmica 22 caminando en la superficie (un poco rengo y reculando) se le aproximan Dr. -
The Agb Newsletter
THE AGB NEWSLETTER An electronic publication dedicated to Asymptotic Giant Branch stars and related phenomena Official publication of the IAU Working Group on Red Giants and Supergiants No. 286 — 2 May 2021 https://www.astro.keele.ac.uk/AGBnews Editors: Jacco van Loon, Ambra Nanni and Albert Zijlstra Editorial Board (Working Group Organising Committee): Marcelo Miguel Miller Bertolami, Carolyn Doherty, JJ Eldridge, Anibal Garc´ıa-Hern´andez, Josef Hron, Biwei Jiang, Tomasz Kami´nski, John Lattanzio, Emily Levesque, Maria Lugaro, Keiichi Ohnaka, Gioia Rau, Jacco van Loon (Chair) Editorial Dear Colleagues, It is our pleasure to present you the 286th issue of the AGB Newsletter. A healthy 30 postings are sure to keep you inspired. Now that the Leuven workshop has happened, we are gearing up to the IAU-sponsored GAPS 2021 virtual discussion meeting aimed to lay out a roadmap for cool evolved star research: we have got an exciting line-up of new talent as well as seasoned experts introducing the final session – all are encouraged to contribute to the meeting through 5-minute presentations or live discussion and the White Paper that will follow (see announcement at the back). Those interested in the common envelope process will no doubt consider attending the CEPO 2021 virtual meeting on this topic organised at the end of August / star of September. Great news on the job front: there are Ph.D. positions in Bordeaux, postdoc positions in Warsaw and another one in Nice. Thanks to Josef Hron and P´eter Abrah´am´ for ensuring the continuation of the Fizeau programme for exchange in the field of interferometry. -
Astrophysics
Publications of the Astronomical Institute rais-mf—ii«o of the Czechoslovak Academy of Sciences Publication No. 70 EUROPEAN REGIONAL ASTRONOMY MEETING OF THE IA U Praha, Czechoslovakia August 24-29, 1987 ASTROPHYSICS Edited by PETR HARMANEC Proceedings, Vol. 1987 Publications of the Astronomical Institute of the Czechoslovak Academy of Sciences Publication No. 70 EUROPEAN REGIONAL ASTRONOMY MEETING OF THE I A U 10 Praha, Czechoslovakia August 24-29, 1987 ASTROPHYSICS Edited by PETR HARMANEC Proceedings, Vol. 5 1 987 CHIEF EDITOR OF THE PROCEEDINGS: LUBOS PEREK Astronomical Institute of the Czechoslovak Academy of Sciences 251 65 Ondrejov, Czechoslovakia TABLE OF CONTENTS Preface HI Invited discourse 3.-C. Pecker: Fran Tycho Brahe to Prague 1987: The Ever Changing Universe 3 lorlishdp on rapid variability of single, binary and Multiple stars A. Baglln: Time Scales and Physical Processes Involved (Review Paper) 13 Part 1 : Early-type stars P. Koubsfty: Evidence of Rapid Variability in Early-Type Stars (Review Paper) 25 NSV. Filtertdn, D.B. Gies, C.T. Bolton: The Incidence cf Absorption Line Profile Variability Among 33 the 0 Stars (Contributed Paper) R.K. Prinja, I.D. Howarth: Variability In the Stellar Wind of 68 Cygni - Not "Shells" or "Puffs", 39 but Streams (Contributed Paper) H. Hubert, B. Dagostlnoz, A.M. Hubert, M. Floquet: Short-Time Scale Variability In Some Be Stars 45 (Contributed Paper) G. talker, S. Yang, C. McDowall, G. Fahlman: Analysis of Nonradial Oscillations of Rapidly Rotating 49 Delta Scuti Stars (Contributed Paper) C. Sterken: The Variability of the Runaway Star S3 Arietis (Contributed Paper) S3 C. Blanco, A. -
OBSERVING Roap STARS with WET: a PRIMER
Baltic Astronomy, vol. 9, 253-353, 2000. OBSERVING roAp STARS WITH WET: A PRIMER D. W. Kurtz1 and P. Martinez2 1 Department of Astronomy, University of Cape Town, Rondebosch 7701, South Africa 2 South African Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa Received November 20, 1999 Abstract. We give an extensive primer on roAp stars - introduc- ing them, putting them in context and explaining terminology and jargon, and giving a thorough discussion of what is known and not known about them. This provides a good understanding of the kind of science WET could extract from these stars. We also discuss the many potential pitfalls and problems in high-precision photometry. Finally, we suggest a WET campaign for the roAp star HR1217. Key words: stars: interiors, oscillations 1. CHEMICALLY PECULIAR STARS OF THE UPPER MAIN SEQUENCE On and near the main sequence for Teff > 6600 K there is a plethora of spectrally peculiar stars and photometric variable stars with a bewildering confusion of names. There are Ap, Bp, CP and Am stars; there are classical Am stars, marginal Am stars and hot Am stars; there are roAp stars and noAp stars; there are magnetic peculiar stars and non-magnetic peculiar stars; He-strong stars, He- weak stars; Si stars, SrTi stars, SrCrEu stars, HgMn stars, PGa stars; A Boo stars; stars with strong metals, stars with weak metals; pulsating peculiar stars, non-pulsating peculiar stars; pulsating nor- mal stars; non-pulsating normal stars; 8 Set stars, S Del stars and p Pup stars; 7 Dor stars, SPB stars, (3 Cephei stars; 7 Cas stars, A Eri stars, a Cyg stars; sharp-lined and broad-lined stars, some of which are peculiar and some of which are not. -
Dusty Shells Surrounding the Carbon Variables S Scuti and RT Capricorni⋆
A&A 566, A69 (2014) Astronomy DOI: 10.1051/0004-6361/201321117 & c ESO 2014 Astrophysics Dusty shells surrounding the carbon variables S Scuti and RT Capricorni M. Mecinaˇ 1, F. Kerschbaum1,M.A.T.Groenewegen2, R. Ottensamer1,J.A.D.L.Blommaert3,4, A. Mayer1,L.Decin3,A.Luntzer1, B. Vandenbussche3 , Th. Posch1, and C. Waelkens3 1 Department of Astrophysics, University of Vienna, Türkenschanzstraße 17, 1180 Vienna, Austria e-mail: [email protected] 2 Koninklijke Sterrenwacht van België, Ringlaan 3, 1180 Brussels, Belgium 3 Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan, 200D, 3001 Leuven, Belgium 4 Department of Physics and Astrophysics, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium Received 16 January 2013 / Accepted 5 May 2014 ABSTRACT For the Mass-loss of Evolved StarS (MESS) programme, the unprecedented spatial resolution of the PACS photometer on board the Herschel Space Observatory was employed to map the dusty environments of asymptotic giant branch (AGB) and red supergiant (RSG) stars. Among the morphologically heterogeneous sample, a small fraction of targets is enclosed by spherically symmetric detached envelopes. Based on observations in the 70 μm and 160 μm wavelength bands, we investigated the surroundings of the two carbon semiregular variables S Sct and RT Cap, which both show evidence for a history of highly variable mass-loss. S Sct exhibits a bright, spherically symmetric detached shell, 138 in diameter and co-spatial with an already known CO structure. Moreover, weak emission is detected at the outskirts, where the morphology seems indicative of a mild shaping by interaction of the wind with the interstellar medium, which is also supported by the stellar space motion. -
5-6Index 6 MB
CLEAR SKIES OBSERVING GUIDES 5-6" Carbon Stars 228 Open Clusters 751 Globular Clusters 161 Nebulae 199 Dark Nebulae 139 Planetary Nebulae 105 Supernova Remnants 10 Galaxies 693 Asterisms 65 Other 4 Clear Skies Observing Guides - ©V.A. van Wulfen - clearskies.eu - [email protected] Index ANDROMEDA - the Princess ST Andromedae And CS SU Andromedae And CS VX Andromedae And CS AQ Andromedae And CS CGCS135 And CS UY Andromedae And CS NGC7686 And OC Alessi 22 And OC NGC752 And OC NGC956 And OC NGC7662 - "Blue Snowball Nebula" And PN NGC7640 And Gx NGC404 - "Mirach's Ghost" And Gx NGC891 - "Silver Sliver Galaxy" And Gx Messier 31 (NGC224) - "Andromeda Galaxy" And Gx Messier 32 (NGC221) And Gx Messier 110 (NGC205) And Gx "Golf Putter" And Ast ANTLIA - the Air Pump AB Antliae Ant CS U Antliae Ant CS Turner 5 Ant OC ESO435-09 Ant OC NGC2997 Ant Gx NGC3001 Ant Gx NGC3038 Ant Gx NGC3175 Ant Gx NGC3223 Ant Gx NGC3250 Ant Gx NGC3258 Ant Gx NGC3268 Ant Gx NGC3271 Ant Gx NGC3275 Ant Gx NGC3281 Ant Gx Streicher 8 - "Parabola" Ant Ast APUS - the Bird of Paradise U Apodis Aps CS IC4499 Aps GC NGC6101 Aps GC Henize 2-105 Aps PN Henize 2-131 Aps PN AQUARIUS - the Water Bearer Messier 72 (NGC6981) Aqr GC Messier 2 (NGC7089) Aqr GC NGC7492 Aqr GC NGC7009 - "Saturn Nebula" Aqr PN NGC7293 - "Helix Nebula" Aqr PN NGC7184 Aqr Gx NGC7377 Aqr Gx NGC7392 Aqr Gx NGC7585 (Arp 223) Aqr Gx NGC7606 Aqr Gx NGC7721 Aqr Gx NGC7727 (Arp 222) Aqr Gx NGC7723 Aqr Gx Messier 73 (NGC6994) Aqr Ast 14 Aquarii Group Aqr Ast 5-6" V2.4 Clear Skies Observing Guides - ©V.A. -
THE OSCILLATION MODES of DELTA SCUTI STARS by Edward J
THE OSCILLATION MODES OF DELTA SCUTI STARS By Edward J. Kennelly B. Sc. (Astronomy) University of Western Ontario M. Sc. (Astronomy) University of British Columbia A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE FACULTY OF GRADUATE STUDIES GEOPHYSICS AND ASTRONOMY We accept this thesis as conforming to the required standard THE UNIVERSITY OF BRITISH COLUMBIA September 1994 © Edward J. Kennelly, 1994 __________________________ advanced In presenting this thesis in partial fulfilment of the requirements for an the Library shall make it degree at the University of British Columbia, I agree that that permission for extensive freely available for reference and study. I further agree copying of this thesis for scholarly purposes may be granted by the head of my department or by his or her representatives. It is understood that copying or publication of this thesis for financial gain shall not be allowed without my written permission. (Signature) Department of cc’d Aroror The University of British Columbia Vancouver, Canada 199L( Date SpI. O DE-6 (2/88) Abstract Many S Scuti stars exhibit multiperiodic oscillations and are therefore considered to be good candidates for studies in stellar seismology; the modes of oscillations act as probes of the internal stellar structure. For S Scuti seismology to be successful, both the oscifiation modes and frequencies must be determined observationaily, then compared with theoreti cal models. Standard photometric observations can provide direct information only about the frequencies of those low-degree oscillations which give rise to large disk-integrated variations. In this thesis, oscillations of both low- and high-degree were studied by ana lyzing the variations introduced in the Doppler-broadened profiles of rapidly rotating S Scuti stars. -
I the Messenger I
I THE MESSENGER I No. 69 - September 1992 NTT Remote Observing from ltaly A. BALESTRA, P. SA NTIN, G. SEDMAK, Astronomical Observatory of Trieste, ltaly M. COMIN, G. RAFFI, A. WALUNDER, ESO 1. Introduction The main goals of the collaboration chltectun for the RO computer net- Remote obsenring (RO) from ESO- were: wok and communication system. Garching is by now a well-establishd The study. design and irnplementa- me implementation of a "second" seaice provided far the user community tian of a portable kit, including fiard- generation of RO software, based on by Em. So far it has been concerned ware and sohare for mote obser- UnIx and workstations hardware. An with instrummb located either at the vations with the ESO NlT from a important part of thls was the exten- CAT or at the 2.2-m telescope at IA European astronomical institute. sion of the real-time database of the Silla, operated from Garching shce The definition of the hardware ar- to a geognphidly dlstritwtd 1987. The advantages of this obming mode include reduced travel times, the possibility to accommodate shorter and regular long-term monitoring observing programmes, the possibility for students to participate in the observation and the facilities (people, Ilbrary and computers) normafly available in a European as- tronomical institute 11 ]. In order to create a new remote ob- senring environment for the EMMl and SUSl instruments on the N7T telescope, a collaboratron with the Astronomical Obsewatory of TriHe, Italy, was started In 1989. The Tdeste Observatory has a kq experience In ha field of Unix- based workstations and on distributed mvironments. -
The Red Supergiants in the Supermassive Stellar Cluster Westerlund 1 (As Supergigantes Vermelhas No Aglomerado Estelar Supermassivo Westerlund 1)
Universidade de S~aoPaulo Instituto de Astronomia, Geof´ısicae Ci^enciasAtmosf´ericas Departamento de Astronomia Aura de las Estrellas Ram´ırezAr´evalo The Red Supergiants in the Supermassive Stellar Cluster Westerlund 1 (As Supergigantes Vermelhas no Aglomerado Estelar Supermassivo Westerlund 1) S~aoPaulo 2018 Aura de las Estrellas Ram´ırezAr´evalo The Red Supergiants in the Supermassive Stellar Cluster Westerlund 1 (As Supergigantes Vermelhas no Aglomerado Estelar Supermassivo Westerlund 1) Disserta¸c~aoapresentada ao Departamento de Astronomia do Instituto de Astronomia, Geof´ısica e Ci^enciasAtmosf´ericasda Universidade de S~aoPaulo como requisito parcial para a ob- ten¸c~aodo t´ıtulode Mestre em Ci^encias. Area´ de Concentra¸c~ao:Astronomia Orientador: Prof. Dr. Augusto Damineli Neto Vers~aoCorrigida. O original encontra- se dispon´ıvel na Unidade. S~aoPaulo 2018 To my parents, Eustorgio and Esmeralda, to whom I owe everything. Acknowledgements This dissertation was possible thanks to the support of many people, to whom I owe not only this manuscript and the work behind it, but many years of personal and professional growth. In the first place I thank my parents, Eustorgio and Esmeralda, for all the unconditional love and the sacrifices they have made to make me the woman I am today, for never leaving me alone no matter how far we are, and for all the support they have given me throughout the years, that has allowed me to fulfill my dreams. This accomplishment is theirs. Pap´a y mam´a,este logro es de ustedes. I thank Alex, my companion during this phase, for his love, patience and priceless support especially in those difficult times, when he would cheer me up. -
VSSC 143Colour B.Pmd
British Astronomical Association VARIABLE STAR SECTION CIRCULAR No 143, March 2010 Contents RZ Cassiopeiae 2009 Phase Diagram ....................................... inside front cover From the Director ............................................................................................... 1 Eclipsing Binary News ...................................................................................... 2 KT Eridani (=Nova Eridani 2009) ...................................................................... 4 Mapping the Accretion Flows in Compact Binaries (VSS Meeting 2009) ...... 7 Some Stars I Don’t Observe .................................................................. 8 3C66A .............................................................................................................. 10 Recurrent Object Programme News ................................................................. 11 RU Herculis Light Curve .................................................................................. 14 First Acquaintance with AI Draconis ............................................................... 15 Long Term Polar Monitoring Programme - An Interim Report ........................ 18 IBVS 5911 - 5926 ............................................................................................. 23 Binocular Priority List ..................................................................................... 24 Eclipsing Binary Predictions ............................................................................ 25 Database for Amateur