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 1552+72 SS UMI No. 637 0945+34 RZ LMI 1920+52 V1113 CYG June 21, 2000 1051+50 CY UMA 1944+36A V811 CYG ---------------------------------------------------------------------------- 2138+43 SS CYGNI The dwarf nova type (SS CYG subclass prototype) cataclysmic variable SS CYG appears to be brightening slightly, as indicated by the observations below. Please continue to keep a very close eye on this star. It is important that we keep the astronomers involved in the upcoming multi-wavelength observing campaign (described in News Flash No. 635) continuously informed of the star's brightness. AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 18.030 12.0 PYG JUN 20.3540 11.8 CCDV ZRE JUN 18.2896 11.27 CCDV PCH JUN 20.3694 11.1 LMK JUN 18.3924 11.35 CCDV PCH JUN 20.8993 11.4 FSE JUN 18.9069 12.3 SCZ JUN 20.90 11.5 VET JUN 18.91 11.4 VET JUN 20.9014 11.4 FSE JUN 18.93 11.4 GGX JUN 20.9090 11.3 FSE JUN 18.9790 11.2 SJZ JUN 20.9174 11.2 FSE JUN 18.997 11.4 MUY JUN 20.9215 11.3 FSE JUN 19.028 12.1 PYG JUN 20.9306 11.3 SCZ JUN 19.1514 11.6 KMA JUN 20.931 11.3 OJR JUN 19.1520 11.7 GMB JUN 20.933 11.5 RMQ JUN 19.3576 11.2 LMK JUN 20.9368 11.3 FSE JUN 19.8931 11.6 SCZ JUN 20.9470 11.2 SJZ JUN 19.91 11.6 VET JUN 21.09 11.5 DGP JUN 19.94 11.6 GGX JUN 21.1208 10.9 BRJ JUN 19.944 11.4 RMQ JUN 21.1510 11.04 CCDV ZRE JUN 19.9800 11.7 SJZ JUN 21.1667 11.0 BTB JUN 20.1639 11.6 KMA JUN 21.1875 10.8 BTB JUN 20.1660 11.8 DKS JUN 21.2257 11.2 BTB JUN 20.1674 11.3 GMB JUN 21.2257 11.1 DEH JUN 20.2104 11.4 HSG JUN 21.3646 11.3 LMK ---------------------------------------------------------------------------- 0945+34 RZ LEONIS MINORIS The dwarf nova type (SU UMA subclass) cataclysmic variable RZ LMI appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 11.1986 15.3: HSG JUN 20.1771 14.4 HSG ---------------------------------------------------------------------------- 1051+50 CY URSAE MAJORIS The dwarf nova type (SU UMA subclass) cataclysmic variable CY UMA appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 19.94 <13.3 SPK JUN 20.948 13.1 SPK JUN 20.1819 <15.3 HSG ---------------------------------------------------------------------------- 1552+72 SS URSAE MINORIS The dwarf nova type (SU UMA subclass) cataclysmic variable SS UMI appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 18.998 <15.0 PYG JUN 20.906 <14.2 OJR JUN 19.925 <14.7 RMQ JUN 20.908 14.9: RMQ JUN 20.1882 14.7 HSG JUN 21.305 <14.0 LMK ---------------------------------------------------------------------------- 1920+52 V1113 CYGNI The dwarf nova type (SS CYG subclass) cataclysmic variable V1113 CYG appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 18.992 <15.0 PYG JUN 20.936 13.5 RMQ JUN 19.956 <14.5 RMQ ---------------------------------------------------------------------------- 1944+36A V811 CYGNI The dwarf nova type (SS CYG subclass) cataclysmic variable V811 CYG is undergoing an outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 10.4118 <15.3 HSG JUN 19.951 14.2: RMQ JUN 11.2153 <14.8 HSG JUN 20.2056 13.9 HSG JUN 12.932 <13.4 OJR JUN 20.939 <14.3 OJR JUN 13.936 <13.9 RMQ JUN 20.942 14.5 RMQ JUN 18.965 13.7 MUY ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BRJ - J. BORTLE, USA MUY - E. MUYLLAERT, BELGIUM BTB - T. BRETL, USA OJR - J. OSORIO, SPAIN DEH - E. DONAGHY, USA PCH - C. PULLEN, USA DGP - G. DYCK, USA PYG - G. POYNER, ENGLAND DKS - S. DVORAK, USA RMQ - M. RESZELSKI, POLAND FSE - S. FOGLIA, ITALY SCZ - E. SCHWEITZER, FRANCE GGX - G. GUZMAN, FRANCE SJZ - J. SPEIL, POLAND GMB - M. GABLE, USA SPK - P. SCHMEER, GERMANY HSG - G. HANSON II, USA VET - M. VERDENET, FRANCE KMA - M. KOMOROUS, CANADA ZRE - R. ZISSELL, USA LMK - M. LINNOLT, USA 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! ____________________________________________________________________________