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: 1508+23 NY SER 2053+25 VW VUL No. 453 1640+25 AH HER June 15, 1999 ---------------------------------------------------------------------------- 1508+23 NY SERPENTIS The cataclysmic variable NY SER appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 06.2431 <16.6 CCDV COO JUN 12.993 <14.7 PYG JUN 07.972 <15.3 PYG JUN 14.971 14.5 PYG JUN 09.972 <14.7 PYG JUN 15.060 14.4 PYG ---------------------------------------------------------------------------- 1640+25 AH HERCULIS The dwarf nova type (Z CAM subclass) cataclysmic variable AH HER appears to be active, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 12.2764 14.6 CCDV COO JUN 14.2375 13.8 ABB JUN 12.997 13.7 PYG JUN 14.2424 13.5 BTH JUN 13.1520 14.02 CCDV ZRE JUN 14.973 12.8 PYG JUN 13.948 13.9 MUY JUN 15.2868 13.4 SXN ---------------------------------------------------------------------------- 2053+25 VW VULPECULAE The dwarf nova type (SU UMA subclass) cataclysmic variable VW VUL appears to be active, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 08.037 15.3 PYG JUN 13.051 <14.5 PYG JUN 10.022 <14.5 PYG JUN 15.017 13.6 PYG JUN 12.20 13.8 DGP ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: ABB - B. ADAMS, USA MUY - E. MUYLLAERT, BELGIUM BTH - T. BURROWS, USA PYG - G. POYNER, ENGLAND COO - L. COOK, USA SXN - M. SIMONSEN, USA DGP - G. DYCK, USA ZRE - R. ZISSELL, 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! ____________________________________________________________________________