PAGE i R Y S A G I T T A R I I L I G H T C U R V E S 1 9 9 1 - 1 9 9 5 AAVSO MONOGRAPH 5 SUPPLEMENT 1 This monograph is dedicated to Ronald E. Royer in recognition of his service and contributions to the Association. Prepared by Janet A. Mattei Elizabeth O. Waagen E. Grant Foster Funds for preparation and publication provided by Ronald E. Royer Clinton B. Ford Additional funds provided by AAVSO Members International Astronomical Union (IAU) ----------------------------------------------------------------------------- PAGE ii ISBN 1-878174-18-5 COPYRIGHT 1996 by the American Association of Variable Star Observers 25 Birch Street Cambridge, Massachusetts 02138 USA All rights reserved. All commercial use of any part of this book requires the written permission of the AAVSO. All non-commercial use by individuals and educators is granted without restriction. ----------------------------------------------------------------------------- PAGE iii TABLE OF CONTENTS Introduction v Observers of RY Sagittarii vii Information on RY Sagittarii viii Key to Symbols viii Light Curves of RY Sagittarii, 1991 - 1995 1 ----------------------------------------------------------------------------- PAGE iv is blank ----------------------------------------------------------------------------- PAGE v RY SAGITTARII LIGHT CURVES, 1991 - 1995 Introduction AAVSO long-term light curves of variable stars contain crucial information that has a significant bearing on many outstanding questions in astrophysics. These light curves define the behavior of variable stars and provide basic sets of observations for multiwavelength data correlation, data analysis, and for checking theories and matching models. The monograph format enables us to present long-term variable star behavior, with each Monograph containing 20 or more years of computer-generated light curves on one star. Each Supplement to a Monograph continues the light curves of the same star, bringing them more up-to-date. RY Sagittarii Light Curves, 1991 - 1995 AAVSO Monograph 5, Supplement 1, contains light curves of RY Sagittarii from 1991 through 1995 (JD 2448258 - 2450083). Pages 1 through 3 contain computer-generated light curves with each dot representing one observation. Observations are plotted Julian date versus magnitude, and the start of each year (January 1) is indicated along the upper axis. A scaled grid is provided to assist in determining the exact date and magnitude of any data point. Factual information on RY Sagittarii and a Key to Symbols are given on page viii. Earlier observations of RY Sagittarii have been published in AAVSO Monograph 5, RY Sagittarii Light Curves 1892 - 1990. The observations in AAVSO Monograph 5, Supplement 1, are the contributions of AAVSO members or observers in the United States and abroad. 89 observers have contributed 3,204 observations to these light curves, and their names and observer codes are given on pages vii. Organizations whose members have contributed observations to the AAVSO either individually or through their organization are listed on page vii. In preparing the data for publication, each observation was evaluated for accuracy by my senior technical assistant Elizabeth O. Waagen, and by me. Software used in evaluating and plotting the observations was developed by my technical assistant E. Grant Foster. The observations from 1991 through 1995 included in this supplement have been preserved on compact disc, cartridge, and printout. Electronic, diskette, or printout copies of observations for further analysis may be obtained by writing or sending email to the AAVSO Director at aavso@aavso.org. The data may also be retrieved for personal use (not for publication or distribution) from the AAVSO's ftp site: ftp.aavso.org (198.116.78.2) in /pub/monographs, or its home page: http://www.aavso.org. Acknowledgements We dedicate AAVSO Monograph 5, Supplement 1, to Monsignor Ronald E. Royer, who has contributed generously to the preparation of the AAVSO monographs and supplements. We extend our sincere thanks to him. We remember with special thanks Clinton B. Ford for his very generous contribution for the preparation of this and subsequent monographs and monograph supplements. Our sincere thanks go to AAVSO members and friends for their contributions to prepare and publish these monographs and monograph supplements. We thank the International Astronomical Union (IAU) for their support of v ----------------------------------------------------------------------------- PAGE vi our monograph series and for the grant provided to the AAVSO to publish this and other monographs and monograph supplements. We gratefully acknowledge the support provided through National Science Foundation Grant AST 7910576 for computerization of a portion of the data in this monograph supplement. We acknowledge with thanks the computer support of the Smithsonian Astrophysical Observatory for preservation of the data. The evaluation of the data and the preparation of this monograph supplement were accomplished using the computer facilities at AAVSO Headquarters. This computer hardware was purchased through grants from the National Aeronautics and Space Administration (grant awards NAGW 1493 and NAG 5-1459), the Kenilworth Fund, and the Theodore H. Dunham Fund for Astrophysical Research. We gratefully acknowledge these grants. Many AAVSO assistants helped in the preparation of the data for publication. My special thanks go to Elizabeth O. Waagen for her careful evaluation of the observations and plotting the light curves, and to E. Grant Foster, for developing the computer programs for the IBM-PC compatible MS-DOS computers at AAVSO Headquarters to evaluate, plot, and prepare the data for publication. Robert S. Hill, Charles M. Jones, and Richard J. Strazdas assisted in the initial development of the computer programs to manage the large volumes of data. Barbara Silva, Donna Eldridge, Douglas Van Orsow, Young Lim, Bethune Kelly, Michael Bickford, and several other student- assistants have helped in making the data computer-readable. The dedication, the many, many hours of observing, and the untiring efforts of our observers in pursuit of contributing to variable star astronomy have made this publication possible. Our very sincere thanks and gratitude go to them for their valuable astronomical contributions. Janet Akyuz Mattei Director Cambridge, Massachusetts April 1996 vi ----------------------------------------------------------------------------- PAGE vii CONTRIBUTORS TO AAVSO DATA ON RY SAGITTARII 1991 - 1995 AMT ADAMS, MARK T. 54 | HAB HAYS JR., ROBERT H. 57 | AB ALBRECHT, WILLIAM 163 | HEN HENSHAW, COLIN 100 | AAA ALVES, AVELINO A. 49 | HE HIETT, F. LANCASTER 105 | AKT ATKIN, TIMOTHY W. 7 | HRI HILL, RICHARD E. 1 | BIC BICHON, LAURENT 2 | IFJ IVES, FRANK J. 10 | BLD BLANE, DAVE 67 | JRW JONES, R. WINFIELD 23 | BAX BOATTINI, ANDREA 2 | JJL JOOSTE, J. 1 | BRJ BORTLE, JOHN E. 43 | KRB KING, ROBERT P. 4 | BDT BRANCHETT, DAVID W. 71 | KRS KOLMAN, ROGER S. 1 | BSM BRINCAT, STEPHEN M. 9 | KOA KOSHIRO, MASAMI 1 | BJY BRYDGES, JEFFREY D. 2 | KAV KOUSHIAPPAS, SAVVAS 1 | CWP CLARKE, WILLIAM P. 15 | KVI KOVACS, ISTVAN 1 | COL COLLINS, PETER L. 110 | LAR LAMBERT, RANDY 3 | CMG COMELLO, GEORG 2 | LMF LARA, MARCO F. 16 | COM COOPER, TIMOTHY 14 | LKG LARSON, KEVIN GARY 1 | CR CRAGG, THOMAS A. 42 | LZT LAZUKA, THOMAS 45 | DBE DEBEER, GERRIT 4 | LCS LOMONACO C., SERGIO 2 | DZS DOMINGUEZ, SERGIO 60 | LHR LOURENCO, HELIO 4 | FJH FEIJTH, HENDRIK 5 | LVT LOVETT, JAMES 37 | FKJ FEKETE, JANOS 1 | LHU LUND, HUGH 7 | FRF FIDRICH, ROBERT 1 | MZS MIZSER, ATTILA 3 | FAA FROSINA, ANGELO 2 | MRV MODIC, ROBERT J. 66 | GBZ GABZO, OFER 10 | MLF MONARD, L. A. G. 122 | GAA GAREY, PATRICK 1 | MOW MORRISON, WARREN C. 73 | GMJ GEYSER, M. 3 | MLQ MUNTON, LYNNE K. 2 | GJM GREAVES, JAMES 1 | NVK NOVAK, MICHAEL 14 | HK HALBACH, EDWARD A. 8 | OER OFEK, ERAN 3 | HMR HAM, RONALD 1 | OB OVERBEEK, M. DANIEL 794 | HSG HANSON, GENE 25 | PLA PADILLA FILHO, ANTONIO 9 | HAV HARVAN, RICHARD P. 6 | PMA PARKER, MARK 1 | RAA RAASCH, RICHARD W. 2 RRB RAPHAEL, ROBERT B. 1 REP REINHARD, PETER 1 RPR ROBBINS, PHILLIP 24 RNB ROBINSON, NEVILLE 3 RR ROYER, RONALD E. 88 SSU SAKUMA, SEI-ICHI 2 STC SANTACANA, GUIDO E. 4 SCX SCIARONI, ERNEST 1 SHS SHARPE, STEVEN B. 12 SHQ SHEMMER, OHAD 4 SJX SMIT, JAN 26 SX SNYDER, LEROY 2 STR STANTON, RICHARD H. 1 STF STEFANOPOULOS, GEORGE 8 STI STEFFEY, PHILIP C. 43 SET STEPHAN, CHRISTOPHER 2 SUX SUAREZ, MAXIMO 4 SVN SVENTEK, PAUL L. 21 TMR THOMAS, RONALD P. 1 THU THOUET, BERNARD 31 VED VEDRENNE, PAUL 66 VET VERDENET, MICHEL 32 VIN VINCENT, JOHN V. 109 WSM WALSH, SIMON 214 WER WEBER, RICHARD J. 3 WI WILLIAMS, DAVID B. 7 WDN WILSON, DANNY RAY 6 YRK YORK, DAVID O. 64 CONTRIBUTING ASTRONOMICAL ORGANIZATIONS Agrupacia Astronomica Albireo of Seville (Spain) Asociacion Argentina Amigos de la Astronomia Association Francaise des Observateurs d'Etoiles Variables (France) Astronomical Society of Southern Africa, Variable Star Section Astronomischer Jugendclub (Austria) Astronomisk Selskab (Scandinavia) British Astronomical Association, Variable Star Section (England) British Astronomical Association of New South Wales (Australia) Bundesdeutsche Arbeitsgemeinschaft fur Veranderliche Sterne e.V.(BAV) (Germany) Grupo Astronomico Silos (Zaragoza, Spain) Grupo Canario de Estrellas Variables (Canary Islands, Spain) Israeli Astronomical Association, Variable Star Section Madrid Astronomical Association M1 (Spain) Liga Ibero-Americana de Astronomia (South America) Magyar Csillagaszati Egyesulet, Valtozocsillag Szakcsoport (Hungary) Nederlandse Vereniging Voor Weer-en Sterrenkunde, Werkgroep Veranderlijke Sterren (Netherlands) Norsk Astronomisk Selskap, Variable Stjernegruppen (Norway) Planetario e Observatorio Astronomico do Colegio Estadual do Parana (Brazil) Red de Observatores de Estrellas Variables - MIRA (Spain) Royal Astronomical Society of Canada Royal Astronomical Society of New Zealand, Variable Star Section Sociedad Astronomica 'Syrma' (Valladolid, Spain) Svensk Amator Astronomisk Forening, variabelsektionen (Sweden) Uniao Brasileira deAstronomia, Variable Star Commission (Brazil) Unione Astrofili Italiani (UAI) Variable Star Observers League in Japan Vereniging Voor Sterrenkunde, Werkgroep Veranderlijke Sterren (Belgium) vii ----------------------------------------------------------------------------- PAGE viii INFORMATION ON RY SAGITTARII Right Ascension Declination Position: (1900) 19h 10m 01s -33 degrees 41.8' (1950) 19 13 17 -33 36.7 (2000) 19 16 33 -33 31.8 Type: R Coronae Borealis R Coronae Borealis stars are one of the rarest types of variable stars. High-luminosity stars of spectral type between B and R, they have carbon- and helium-rich and hydrogen-poor spectra, with emission lines of metals seen at minimum brightness. Optically, they are at maximum brightness most of the time, and at irregular intervals they show non-periodic fadings of 1 to 9 magnitudes, lasting from several tens to several hundreds of days. Small amplitude pulsations of several tenths of a magnitude in amplitude, with periods ranging from 20 to 100 days, are also seen in the light curves of some stars of this type. Spectrum: G0IAEP(C1,0) In the spectrum: G0 - spectrum type I - supergiant luminosity class A - hydrogen alpha Balmer line E - emission lines P - peculiar spectrum C1,0 - carbon star spectrum Other Information: In the optical light curve of RY Sagittarii, there are small amplitude light variations between 0.1 and 1.5 magnitudes and a 38.6-day period due to the pulsation of the star. KEY TO SYMBOLS Symbols used in this monograph are: . = 1 visual observation v = variable is fainter than the magnitude indicated by the vertex of the "v" on the light curve (variable not seen) Please note that there may appear to be horizontal lines in some parts of the light curves. These horizontal "lines" are in fact very dense concentrations of individual observations. viii ----------------------------------------------------------------------------- PAGE ix RY SAGITTARII LIGHT CURVES 1991 - 1995 ----END OF FILE--------------------------------------------------------------