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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 -
Stellarium for Cultural Astronomy Research
RESEARCH The Simulated Sky: Stellarium for Cultural Astronomy Research Georg Zotti Ludwig Boltzmann Institute for Archaeological Prospection and Virtual Archaeology, Vienna, Austria [email protected] Susanne M. Hoffmann Friedrich-Schiller-Universität Jena, Michael-Stifel-Center/ Institut für Informatik and Physikalisch- Astronomische Fakultät, Jena, Germany [email protected] Alexander Wolf Altai State Pedagogical University, Barnaul, Russia [email protected] Fabien Chéreau Stellarium Labs, Toulouse, France [email protected] Guillaume Chéreau Noctua Software, Hong Kong [email protected] Abstract: For centuries, the rich nocturnal environment of the starry sky could be modelled only by analogue tools such as paper planispheres, atlases, globes and numerical tables. The immer- sive sky simulator of the twentieth century, the optomechanical planetarium, provided new ways for representing and teaching about the sky, but the high construction and running costs meant that they have not become common. However, in recent decades, “desktop planetarium programs” running on personal computers have gained wide attention. Modern incarnations are immensely versatile tools, mostly targeted towards the community of amateur astronomers and for knowledge transfer in transdisciplinary research. Cultural astronomers also value the possibili- ties they give of simulating the skies of past times or other cultures. With this paper, we provide JSA 6.2 (2020) 221–258 ISSN (print) 2055-348X https://doi.org/10.1558/jsa.17822 ISSN (online) 2055-3498 222 Georg Zotti et al. an extended presentation of the open-source project Stellarium, which in the last few years has been enriched with capabilities for cultural astronomy research not found in similar, commercial alternatives. -
Asteroseismology of SZ Lyn Using Multi-Band High Time Resolution Photometry from Ground and Space
MNRAS 000,1{16 (2020) Preprint 23 December 2020 Compiled using MNRAS LATEX style file v3.0 Asteroseismology of SZ Lyn using Multi-Band High Time Resolution Photometry from Ground and Space J. Adassuriya1?, S. Ganesh2, J. L. Guti´errez3, G. Handler4, Santosh Joshi5 K. P. S. C. Jayaratne6, K. S. Baliyan2 1Astronomy Division, Arthur C Clarke Institute, Katubedda, Moratuwa, Sri Lanka 2Astronomy and Astrophysics Division, Physical Research Laboratory, Ahmedabad, India 3Department of Physics, Universitat Polit`ecnica de Catalunya, Castelldefels, Spain 4Nicolaus Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland 5Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak-Nainital, India 6Department of Physics, University of Colombo, Colombo, Sri Lanka Accepted XXX. Received YYY; in original form ZZZ ABSTRACT We report the analysis of high temporal resolution ground and space based photometric observations of SZ Lyncis, a binary star one of whose components is a high amplitude δ Scuti. UBVR photometric observations were obtained from Mt. Abu Infrared Observatory and Fairborn Observatory; archival observations from the WASP project were also included. Furthermore, the continuous, high quality light curve from the TESS project was extensively used for the analysis. The well resolved light curve from TESS reveals the presence of 23 frequencies with four independent modes, 13 harmonics of the main pulsation frequency of 8:296943±0:000002 d−1 and their combinations. The frequency 8.296 d−1 is identified as the fundamental radial mode by amplitude ratio method and using the estimated pulsation constant. The frequencies 14.535 d−1, 32.620 d−1 and 4.584 d−1 are newly discovered for SZ Lyn. -
Arxiv:1709.07265V1 [Astro-Ph.SR] 21 Sep 2017 an Der Sternwarte 16, 14482 Potsdam, Germany E-Mail: [email protected] 2 Smitha Subramanian Et Al
Noname manuscript No. (will be inserted by the editor) Young and Intermediate-age Distance Indicators Smitha Subramanian · Massimo Marengo · Anupam Bhardwaj · Yang Huang · Laura Inno · Akiharu Nakagawa · Jesper Storm Received: date / Accepted: date Abstract Distance measurements beyond geometrical and semi-geometrical meth- ods, rely mainly on standard candles. As the name suggests, these objects have known luminosities by virtue of their intrinsic proprieties and play a major role in our understanding of modern cosmology. The main caveats associated with standard candles are their absolute calibration, contamination of the sample from other sources and systematic uncertainties. The absolute calibration mainly de- S. Subramanian Kavli Institute for Astronomy and Astrophysics Peking University, Beijing, China E-mail: [email protected] M. Marengo Iowa State University Department of Physics and Astronomy, Ames, IA, USA E-mail: [email protected] A. Bhardwaj European Southern Observatory 85748, Garching, Germany E-mail: [email protected] Yang Huang Department of Astronomy, Kavli Institute for Astronomy & Astrophysics, Peking University, Beijing, China E-mail: [email protected] L. Inno Max-Planck-Institut f¨urAstronomy 69117, Heidelberg, Germany E-mail: [email protected] A. Nakagawa Kagoshima University, Faculty of Science Korimoto 1-1-35, Kagoshima 890-0065, Japan E-mail: [email protected] J. Storm Leibniz-Institut f¨urAstrophysik Potsdam (AIP) arXiv:1709.07265v1 [astro-ph.SR] 21 Sep 2017 An der Sternwarte 16, 14482 Potsdam, Germany E-mail: [email protected] 2 Smitha Subramanian et al. pends on their chemical composition and age. To understand the impact of these effects on the distance scale, it is essential to develop methods based on differ- ent sample of standard candles. -
DAKW 46 2 0317-0349.Pdf
ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Denkschriften der Akademie der Wissenschaften.Math.Natw.Kl. Frueher: Denkschr.der Kaiserlichen Akad. der Wissenschaften. Fortgesetzt: Denkschr.oest.Akad.Wiss.Mathem.Naturw.Klasse. Jahr/Year: 1883 Band/Volume: 46_2 Autor(en)/Author(s): Herz Norbert, Strobl Josef Artikel/Article: Reduction des AuwersŽschen Fundamental-Cataloges auf die Le VerrierŽschen Praecessionscoefficienten. 317-349 317 REDUCTION DES AITWERS'SCHEN FUNDAMENTAL-CATALOGES AUF DIE LE-VERRIER'SOMEN PEAEGESSIONSCOEFFICIENTEN. D,!- NORBERT HE HZ UND JOSEF STROBE. VORGBr,EGT IN DER SITZUNG DER MATIIKMATISOH-NATURWrSSKNSCHAFTliICHBN CLASSE AM 16. NOVEMBER 1882. l/er in den „Publicationen der Astronom ischen Gesellschaft XIV" gegebene „Fundamental- Catalog fiiv die Zouenbeobachtungen am nordlichen Himmel", welcher die Positionen und Reductionsgrossen von 539 Sternen fiir das mittlere Aquinoetium 1875-0 enthalt, nebst der in der „Viertel- ja brsschrift der Astronomischen Gesellschaft XV" enthaltenen Fortsetzung fiir 83 sttdliche Sterne ist durch die Beniitzung der zablreichen Beobachtungen, die an verschiedenen Sternwarten gemacht warden, thatsachlich zu einem Fundamente fur die Fixsternbestimmung geworden, indem es einen bohen Grad der Wahrscheinlichkeit hat, dass die constanten Fehler, welche der Beobachtungsreihe einer Sternwarte ange- boren, mdglichst eliminirt sind; denn die constanten Differenzen, die sich aus den, in den verschiedenen Fix- sternverzeichnissen niedergelegtcn Beobaclitungen eines einzigen Beobacbtungsortes finden, haben bei Ableitung der walirseheinlichsten Positionen strenge Beriicksichtigung geiimden. Fiir die Berechnung der Reductionselemente auf das mittlere Aquinoctium einer anderen Epoche ist die Struve'sche Praecessionsconstante angewendet und demgemass die Eigenbewegung bestimmt worden. In den jetzt allgemein angewandten L e-Terrier'schen Sonnentafeln ist aber eine andere, dem Wesen nach mit der Bessel'scben identiscbe verwendet. -
Interferometric Diameters of Five Evolved Intermediate-Mass Planet
MNRAS 000, 1–11 (2018) Preprint 18 April 2018 Compiled using MNRAS LATEX style file v3.0 Interferometric diameters of five evolved intermediate-mass planet-hosting stars measured with PAVO at the CHARA Array T. R. White,1,2,3⋆ D. Huber,4,5,1,6 A. W. Mann,7,8,9 L. Casagrande,10,11 S. K. Grunblatt,4 A. B. Justesen,1 V. Silva Aguirre,1 T. R. Bedding,5,1 M. J. Ireland,10 G. H. Schaefer,12 P. G. Tuthill5 1Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark 2Institut für Astrophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany 3Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany 4Institute for Astronomy, University of Hawai‘i, 2680 Woodlawn Drive, Honolulu, HI 96822, USA 5Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia 6SETI Institute, 189 Bernardo Avenue, Mountain View, CA 94043, USA 7Department of Astronomy, The University of Texas at Austin, Austin, TX 78712, USA 8Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027, USA 9NASA Hubble Fellow 10Research School of Astronomy and Astrophysics, Mount Stromlo Observatory, The Australian National University, ACT 2611, Australia 11ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) 12The CHARA Array of Georgia State University, Mount Wilson Observatory, Mount Wilson, CA 91023, USA Accepted XXX. Received YYY; in original form ZZZ ABSTRACT Debate over the planet occurrence rates around intermediate-mass stars has hinged on the accurate determination of masses of evolved stars, and has been exacerbated by a paucity of reliable, directly-measured fundamental properties for these stars. -
Extrasolar Planets and Their Host Stars
Kaspar von Braun & Tabetha S. Boyajian Extrasolar Planets and Their Host Stars July 25, 2017 arXiv:1707.07405v1 [astro-ph.EP] 24 Jul 2017 Springer Preface In astronomy or indeed any collaborative environment, it pays to figure out with whom one can work well. From existing projects or simply conversations, research ideas appear, are developed, take shape, sometimes take a detour into some un- expected directions, often need to be refocused, are sometimes divided up and/or distributed among collaborators, and are (hopefully) published. After a number of these cycles repeat, something bigger may be born, all of which one then tries to simultaneously fit into one’s head for what feels like a challenging amount of time. That was certainly the case a long time ago when writing a PhD dissertation. Since then, there have been postdoctoral fellowships and appointments, permanent and adjunct positions, and former, current, and future collaborators. And yet, con- versations spawn research ideas, which take many different turns and may divide up into a multitude of approaches or related or perhaps unrelated subjects. Again, one had better figure out with whom one likes to work. And again, in the process of writing this Brief, one needs create something bigger by focusing the relevant pieces of work into one (hopefully) coherent manuscript. It is an honor, a privi- lege, an amazing experience, and simply a lot of fun to be and have been working with all the people who have had an influence on our work and thereby on this book. To quote the late and great Jim Croce: ”If you dig it, do it. -
Brightest Stars : Discovering the Universe Through the Sky's Most Brilliant Stars / Fred Schaaf
ffirs.qxd 3/5/08 6:26 AM Page i THE BRIGHTEST STARS DISCOVERING THE UNIVERSE THROUGH THE SKY’S MOST BRILLIANT STARS Fred Schaaf John Wiley & Sons, Inc. flast.qxd 3/5/08 6:28 AM Page vi ffirs.qxd 3/5/08 6:26 AM Page i THE BRIGHTEST STARS DISCOVERING THE UNIVERSE THROUGH THE SKY’S MOST BRILLIANT STARS Fred Schaaf John Wiley & Sons, Inc. ffirs.qxd 3/5/08 6:26 AM Page ii This book is dedicated to my wife, Mamie, who has been the Sirius of my life. This book is printed on acid-free paper. Copyright © 2008 by Fred Schaaf. All rights reserved Published by John Wiley & Sons, Inc., Hoboken, New Jersey Published simultaneously in Canada Illustration credits appear on page 272. Design and composition by Navta Associates, Inc. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning, or otherwise, except as permitted under Section 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 646-8600, or on the web at www.copy- right.com. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, (201) 748-6011, fax (201) 748-6008, or online at http://www.wiley.com/go/permissions. -
Astrometric Search for Extrasolar Planets in Stellar Multiple Systems
Astrometric search for extrasolar planets in stellar multiple systems Dissertation submitted in partial fulfillment of the requirements for the degree of doctor rerum naturalium (Dr. rer. nat.) submitted to the faculty council for physics and astronomy of the Friedrich-Schiller-University Jena by graduate physicist Tristan Alexander Röll, born at 30.01.1981 in Friedrichroda. Referees: 1. Prof. Dr. Ralph Neuhäuser (FSU Jena, Germany) 2. Prof. Dr. Thomas Preibisch (LMU München, Germany) 3. Dr. Guillermo Torres (CfA Harvard, Boston, USA) Day of disputation: 17 May 2011 In Memoriam Siegmund Meisch ? 15.11.1951 † 01.08.2009 “Gehe nicht, wohin der Weg führen mag, sondern dorthin, wo kein Weg ist, und hinterlasse eine Spur ... ” Jean Paul Contents 1. Introduction1 1.1. Motivation........................1 1.2. Aims of this work....................4 1.3. Astrometry - a short review...............6 1.4. Search for extrasolar planets..............9 1.5. Extrasolar planets in stellar multiple systems..... 13 2. Observational challenges 29 2.1. Astrometric method................... 30 2.2. Stellar effects...................... 33 2.2.1. Differential parallaxe.............. 33 2.2.2. Stellar activity.................. 35 2.3. Atmospheric effects................... 36 2.3.1. Atmospheric turbulences............ 36 2.3.2. Differential atmospheric refraction....... 40 2.4. Relativistic effects.................... 45 2.4.1. Differential stellar aberration.......... 45 2.4.2. Differential gravitational light deflection.... 49 2.5. Target and instrument selection............ 51 2.5.1. Instrument requirements............ 51 2.5.2. Target requirements............... 53 3. Data analysis 57 3.1. Object detection..................... 57 3.2. Statistical analysis.................... 58 3.3. Check for an astrometric signal............. 59 3.4. Speckle interferometry................. -
BK Lyncis: the Oldest Old Nova and a Bellwether for Cataclysmic Variable
BK LYNCIS: THE OLDEST OLD NOVA?... AND A BELLWETHER FOR CATACLYSMIC-VARIABLE EVOLUTION by Joseph Patterson1, Helena Uthas1, Jonathan Kemp1, Enrique de Miguel2, Thomas Krajci3, Jerry Foote4, Franz-Josef Hambsch5, Tut Campbell6, George Roberts7, David Cejudo8, Shawn Dvorak9, Tonny Vanmunster10, Robert Koff11, David Skillman12, David Harvey13, Brian Martin14, John Rock15, David Boyd16, Arto Oksanen17, Etienne Morelle18, Joseph Ulowetz19, Anthony Kroes20, Richard Sabo21, and Lasse Jensen22 1 Columbia University, Department of Astronomy, 550 West 120th Street, New York, NY 10027; [email protected], [email protected], [email protected] 2 CBA-Huelva, Observatorio del CIECEM, Matalascañas, 21076 Almonte, Huelva, Spain & Departamento de Física Aplicada, Universidad de Huelva, 21071 Huelva, Spain; [email protected] 3 CBA New Mexico, PO Box 1351 Cloudcroft, NM 88317; [email protected] 4 CBA-Utah, 4175 East Red Cliffs Drive, Kanab, UT 84741; [email protected] 5 CBA-Mol, Oude Bleken 12, B-2400 Mol, Belgium; [email protected] 6 CBA-Arkansas, 7021 Whispering Pine, Harrison, AR 72601; [email protected] 7 CBA-Tennessee, 2007 Cedarmont Drive, Franklin, TN 37067; [email protected] 8 CBA-Madrid, Camino de las Canteras 42, Buzon 5, La Pradera del Amor, El Berrueco, 28192 Madrid, Spain; [email protected] 9 CBA-Orlando, Rolling Hills Observatory, 1643 Nightfall Drive, Clermont, FL; [email protected] 10 CBA-Belgium, Walhostraat 1A, B-3401 Landen, Belgium; [email protected] 11 CBA-Colorado, -
NOAO Annual Report for FY06
Appendix A NOAO SCIENTIFIC STAFF: FY06 ACCOMPLISHMENTS AND FY07 PLANS ¬New appointment in FY06 S Non-NSF (external) funding ±Term ended in FY06 HELMUT A. ABT, Emeritus Astronomer Research Interests Formation and evolution of double stars; publication statistics FY06 Accomplishments: Abt considered the eccentricities of 553 spectroscopic and 616 visual binaries with known orbital elements and dwarf primaries. These show that for long periods (P>275 yrs), all eccentricities are equally probable, indicating that when wide binaries are formed, no single eccentricity is preferred. For shorter periods due to tidal interactions, the highest eccentricities disappear first until, for the shortest periods, only the zeros remain. Abt also considered the papers published in the major journals in five sciences (physics, astronomy, geophysics, mathematics, and chemistry). The numbers of papers published annually since 1970 divided by the numbers of members of the appropriate scientific society (e.g. American Physical Society) are constants, indicating that the numbers of scientific papers depend only on the numbers of research scientists and not upon the quality, sensitivity, or quantity of the instruments and computers that they used. Abt presented talks in China on “Early Chinese Inventions” and “National Astronomical Productivities” at Nanjing University and the Purple Mountain Observatory in Nanjing; “Stellar Disks and the Interstellar Medium” at National Astronomical Observatory, Beijing; “Early Chinese Inventions” at Beijing Normal Univ. Beijing. Abt attended the Seventh Pacific Rim Conference on Stellar Astrophysics in Seoul, South Korea, in November 2005, and gave talks on “The First Six Pacific Rim Conferences” and “Tidal Effects in Binaries.” He attended the Centennial Celebration for Dorrit Hoffleit at Yale Univ. -
Astrophysics in 1998
UC Irvine UC Irvine Previously Published Works Title Astrophysics in 1998 Permalink https://escholarship.org/uc/item/3bp5s0f2 Journal Publications of the Astronomical Society of the Pacific, 111(758) ISSN 0004-6280 Authors Trimble, V Aschwanden, M Publication Date 1999 DOI 10.1086/316342 License https://creativecommons.org/licenses/by/4.0/ 4.0 Peer reviewed eScholarship.org Powered by the California Digital Library University of California PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 111:385È437, 1999 April ( 1999. The Astronomical Society of the PaciÐc. All rights reserved. Printed in U.S.A. Invited Review Astrophysics in 1998 VIRGINIA TRIMBLE1 AND MARKUS ASCHWANDEN2 Received 1998 December 10; accepted 1998 December 11 ABSTRACT. From Alpha (Orionis and the parameter in mixing-length theory) to Omega (Centauri and the density of the universe), the Greeks had a letter for it. In between, we look at the Sun and planets, some very distant galaxies and nearby stars, neutrinos, gamma rays, and some of the anomalies that arise in a very large universe being studied by roughly one astronomer per 107 Galactic stars. 1. INTRODUCTION trated in a few highly regarded journals, and, of course, for power to be concentrated in fewer and fewer editorial Astrophysics in 1998 welcomes a new co-author, Markus hands. Aschwanden, formerly of the University of Maryland astronomy department, and as a direct result, gives some attention to solar physics, which has been relatively neglected in recent years. Lucy-Ann McFadden, meanwhile, 1.1. Up, Up, and Away is up to her very capable shoulders in the Near Earth Aster- oid Rendezvous (NEAR) project, a Maryland honors A great many things got started during the year.