THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS 25 Birch Street, Cambridge, MA 02138 USA Tel. 617-354-0484 Fax 617-354-0665 http://www.aavso.org * * * AAVSO NEWS FLASH * * * Subject: 2138+43 SS CYG 1051+50 CY UMA No. 448 1040-51 V382 VEL 1805-14 UZ SER June 7, 1999 0409-71 VW HYI 1953+77 AB DRA 0905+51 DI UMA ---------------------------------------------------------------------------- 2138+43 SS CYGNI As SS Cyg is slowly reaching its maximum, it is scheduled to be observed with HST, EUVE, and RXTE satellites from June 7 through 21. We thank all our observers who have been keeping a very close eye on SS Cyg and sending in observations to AAVSO. Your observations made the scheduling of these three satellites possible. This is the first time that HST, EUVE, and RXTE are observing an outburst of SS Cyg simultaneously! PLEASE CONTINUE SENDING IN YOUR OBSERVATIONS DAILY TO HEADQUARTERS THROUGH JUNE 22 so that we can keep our colleagues at Lawrence Livermore National Laboratory informed. Below are 1-day means of the observations of SS Cyg which we have received since May 25th. Please see the "Quick Look" file on the AAVSO web page if you would like to view the complete data file. (http://www.aavso.org/ql/) JD Magnitude 2451324.0295 11.70 2451325.0215 11.60 2451325.8550 11.58 2451327.0818 11.30 2451328.7840 10.90 2451330.0472 11.00 2451331.2838 10.73 2451332.3456 10.39 2451333.4318 10.19 2451334.0421 10.21 2451334.9619 9.89 2451336.1330 9.71 2451336.7044 9.44 ---------------------------------------------------------------------------- 1040-51 V382 VELORUM = N VEL 99 The position of V382 Vel (N Vel 99) on the AAVSO "aa" scale chart has been corrected. Also, a "b" scale chart is now available. Both charts can be found on the AAVSO web site at the following address: charts.aavso.org/prelim/vel/v382_vel/ Below are 1-day means of the observations of V382 Vel which we have received since May 24th. Please see the "Quick Look" file on the AAVSO web page if you would like to view the complete data file. (http://www.aavso.org/ql/) JD Magnitude 2451323.0303 3.29 2451323.8444 3.61 2451324.9786 4.02 2451326.0305 4.15 2451326.8746 4.51 2451328.1371 4.72 2451328.9967 4.86 2451330.0042 5.09 2451330.9230 5.19 2451331.5987 5.35 2451332.8986 5.49 2451333.8485 5.63 2451334.8894 5.70 2451336.0876 5.84 2451336.7850 6.10 ---------------------------------------------------------------------------- 0409-71 VW HYDRI The dwarf nova type (SU UMA subclass) cataclysmic variable VW HYI is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 04.3625 13.5 SRX JUN 06.699 9.9 OB JUN 04.7 <12.0 OB JUN 06.792 10.2 HJN JUN 06.5208 10.0 SRX ---------------------------------------------------------------------------- 0905+51 DI URSAE MAJORIS The dwarf nova type cataclysmic variable DI UMA may be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 16.917 <15.3 PYG JUN 04.936 <14.2 PYG MAY 25.953 <14.2 PYG JUN 06.2604 14.6: SQN MAY 26.929 <14.2 PYG ---------------------------------------------------------------------------- 1051+50 CY URSAE MAJORIS The dwarf nova type (SU UMA subclass) cataclysmic variable CY UMA is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 04.965 <14.8 PYG JUN 06.2535 13.0 HSG JUN 05.2271 13.3 BTH JUN 06.2681 12.9 SQN JUN 05.902 12.8 DPV JUN 06.885 13.1 DPV JUN 06.2313 13.7 BTH JUN 07.1528 13.4: BEB ---------------------------------------------------------------------------- 1805-14 UZ SERPENTIS The dwarf nova type (possible Z CAM subclass) cataclysmic variable UZ SER is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 04.4458 <13.6 SRX JUN 06.4590 13.8 CCDV COO JUN 06.1960 14.78 CCDV ZRE JUN 06.5389 13.4 SRX ---------------------------------------------------------------------------- 1953+77 AB DRACONIS The dwarf nova type (Z CAM subclass) cataclysmic variable AB DRA is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 31.1720 15.4 CCDV ZRE JUN 05.000 13.0 PYG JUN 01.2790 15.1 CCDV ZRE JUN 05.1250 12.7 BRJ JUN 02.942 14.2: MUY JUN 05.941 12.8 DPV JUN 03.881 12.7 DPV JUN 06.1231 12.9 BEB JUN 03.947 12.8 MUY JUN 06.2150 13.1 CCDV ZRE JUN 04.2826 12.6 SWT JUN 06.923 13.2 DPV JUN 04.3100 12.6 CCDV ZRE JUN 07.2380 13.5 CCDV ZRE ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: AAA - A. AVELINO, BRAZIL KTO - T. KINNUNEN, FINLAND AAX - A. AMORIM, BRAZIL LCS - S. LOMONACO CARVALHO, BRAZIL ARL - R. ALENCAR CALDAS, BRAZIL LIW - W. LILLER, CHILE BCC - C. BRASIL JR., BRAZIL LMF - M. LARA, BRAZIL BEB - R. BERG, USA MDP - P. MCDONALD, CANADA BEB - R. BERG, USA MLF - L. MONARD, SOUTH AFRICA BIV - I. BALOGH, HUNGARY MMD - M. MENDES, BRAZIL BMM - M. BIESMANS, BELGIUM MMZ - M. MATTIAZZO, AUSTRALIA BNV - N. BIVER, NORWAY MQC - Q. MCCLEERY, USA BRJ - J. BORTLE, USA MRV - R. MODIC, USA BSR - S. BARONI, ITALY MUY - E. MUYLLAERT, BELGIUM BTB - T. BRETL, USA NPM - P. NORRIS, USA BTH - T. BURROWS, USA NTA - T. NAPOLEAO, BRAZIL BVE - E. VAN BALLEGOY, NETHERLANDS OB - M. OVERBEEK, SOUTH AFRICA BXM - M. BAIN, BRAZIL OJR - J. OSORIO, SPAIN CAY - A. COEHLO, BRAZIL PEX - A. PEARCE, AUSTRALIA CCT - C. COLESANTI, BRAZIL PFD - F. PFAFFENDORF, ARGENTINA CKN - K. CASTLE, USA PLA - A. PADILLA FILHO, BRAZIL CMG - G. COMELLO, NETHERLANDS PPB - P. PECORELLI, ARGENTINA COO - L. COOK, USA PYG - G. POYNER, ENGLAND DAH - H. DAHLE, NORWAY RCH - C. RAMILLON, FRANCE DIL - W. DILLON, USA RFP - P. REIS FERNANDES, BRAZIL DLA - A. DILL, USA RMQ - M. RESZELSKI, POLAND DLQ - L. DUCZMAL, BRAZIL RR - R. ROYER, USA DPL - P. DOMBROWSKI, USA RSU - S. RAE, NEW ZEALAND DPV - P. DUBOVSKY, SLOVAKIA SBN - A. SILVA BARROS, BRAZIL DSG - S. DALLAPORTA, ITALY SCE - C. SCOVIL, USA DSJ - J. DE SOUZA AGUIAR, BRAZIL SHS - S. SHARPE, USA DVC - C. DEVILLIERS, SOUTH AFRICA SJZ - J. SPEIL, POLAND FFL - F. FUNARI, BRAZIL SPK - P. SCHMEER, GERMANY FMQ - M. FIASCHI, ITALY SPV - P. SOBOTKA, CZECH REPUBLIC FMX - F. FARRELL, AUSTRALIA SQL - R. SALVO, URUGUAY FSE - S. FOGLIA, ITALY SQN - L. SHAW, USA GAJ - J. GARCIA, ARGENTINA SRX - R. STUBBINGS, AUSTRALIA GFE - F. GARCIA, ARGENTINA SWQ - W. SOUZA, BRAZIL GMB - M. GABLE, USA SWT - R. STEWART, USA GRI - J. GRIESE III, USA TUB - V. TUBOLY, HUNGARY GUN - J. GUNTHER, FRANCE VHC - H. VITAL, BRAZIL HAB - R. HAYS JR., USA VOL - W. VOLLMANN, AUSTRIA HJN - J. HERS, SOUTH AFRICA WPX - P. WILLIAMS, NEW ZEALAND HJX - J. HODAR, BRAZIL WSM - S. WALSH, ZIMBABWE HK - E. HALBACH, USA ZLT - T. ZALEZSAK, AUSTRALIA HSG - G. HANSON II, USA ZRE - R. ZISSELL, USA KMA - M. KOMOROUS, CANADA Please monitor these and other variable stars closely and phone-in, fax, or e-mail your observations to the AAVSO. Good observing! Janet A. Mattei, Director Rebecca Pellock, Technical Assistant ____________________________________________________________________________ Symbols may include: < = fainter than magnitude given (variable not seen) : = uncertain CCDV = Charge-coupled device with (V) filter If you would like to contribute to AAVSO NEWS FLASH, please send observations of unusual variable star activity to: observations@aavso.org Those who wish to subscribe (free of charge) or unsubscribe to NEWS FLASH may do so by visiting the following web page: http://www.aavso.org If you would like data from the AAVSO International Database for research purposes, please send your request to: Janet Mattei, AAVSO Director, at aavso@aavso.org An archive of past issues of the News Flash is available at the following web page: http://www.aavso.org/newsflash/ We look forward to including your observations in future editions of AAVSO NEWS FLASH! ____________________________________________________________________________