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 No. 635 0749+22 U GEM June 14, 2000 1958+16 RZ SGE ---------------------------------------------------------------------------- 2138+43 SS CYGNI - Observing Campaign Reminder Astronomers at Livermore National Laboratory in California are preparing for an observing campaign involving three satellites: Chandra, RXTE, and EUVE. The goal during this campaign is to observe SS Cyg at maximum with all three instruments. We ask that you keep a very close eye on this variable. Immediate notification of the star's brightening and good coverage throughout the next outburst are extremely important for the triggering of the satellite observations and for correlation with the satellite data. ---------------------------------------------------------------------------- 0749+22 U GEMINORUM The dwarf nova type (SS CYG subclass) cataclysmic variable U GEM appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 09.1701 14.2: HSG JUN 14.2687 9.6 LMK JUN 10.1660 <13.8 HSG JUN 14.2778 9.7 LMK JUN 13.27 <11.0: LMK JUN 14.2882 9.8 LMK ---------------------------------------------------------------------------- 1958+16 RZ SAGITTAE The dwarf nova type (SU UMA subclass) cataclysmic variable RZ SGE is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 11.3882 <16.3 HSG JUN 13.903 12.8 RMQ JUN 12.942 <13.7 RMQ JUN 13.953 12.5 RMQ JUN 12.96 <13.4 SPK JUN 14.628 12.6 SRX JUN 13.069 13.0 SPK ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: HSG - G. HANSON II, USA SPK - P. SCHMEER, GERMANY LMK - M. LINNOLT, USA SRX - R. STUBBINGS, AUSTRALIA RMQ - M. RESZELSKI, POLAND Please monitor these and other variable stars closely and phone-in, fax, or e-mail your observations to the AAVSO. Good observing! Rebecca Pellock, Technical Assistant on behalf of Janet A. Mattei, Director ____________________________________________________________________________ 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! ____________________________________________________________________________