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: 0854-41 CU VEL 1640+25 AH HER No. 500!!!!! 1552+72 SS UMI September 22, 1999 ---------------------------------------------------------------------------- 0854-41 CU VELORUM The dwarf nova type (SU UMA subclass) cataclysmic variable CU VEL appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials SEP 13.7708 <14.0 SRX SEP 20.7861 14.0 SRX SEP 20.7708 14.0 SRX SEP 22.115 10.3 OB ---------------------------------------------------------------------------- 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 SEP 17.870 <15.3 PYG SEP 20.825 13.9 MUY ---------------------------------------------------------------------------- 1640+25 AH HERCULIS The dwarf nova type (Z CAM subclass) cataclysmic variable AH HER is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials SEP 19.0625 14.0 KMA SEP 20.833 13.2 MUY SEP 20.0090 13.28 CCDV ZRE SEP 22.0798 12.8 BEB SEP 20.0354 13.0 DPL SEP 22.1174 12.8 BEB SEP 20.076 13.3 MRV ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BEB - R. BERG, USA OB - M. OVERBEEK, SOUTH AFRICA DPL - P. DOMBROWSKI, USA PYG - G. POYNER, ENGLAND KMA - M. KOMOROUS, CANADA SRX - R. STUBBINGS, AUSTRALIA MRV - R. MODIC, USA ZRE - R. ZISSELL, USA MUY - E. MUYLLAERT, BELGIUM 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! ____________________________________________________________________________