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: 0809-76 Z CHA No. 619 1921+50 CH CYG May 12, 2000 ---------------------------------------------------------------------------- 0809-76 Z CHAMAELONIS The dwarf nova type (SU UMA subclass) cataclysmic variable Z CHA appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 02.4250 15.0 SRX MAY 11.5625 11.9 PEX ---------------------------------------------------------------------------- 1921+50 CH CYGNI The symbiotic variable CH CYG is fading, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 23.035 7.8 RMQ MAY 04.0030 8.5 SJZ APR 23.081 7.8 PYG MAY 04.2889 8.8 KMA APR 23.3000 7.9 BEB MAY 04.9313 8.3 FSE APR 24.026 8.0 RMQ MAY 05.9780 8.7 SJZ APR 24.135 8.3 MUY MAY 06.0000 8.3 BXA APR 24.959 7.9 RMQ MAY 06.8576 8.8 DPV APR 26.929 8.1 RMQ MAY 06.928 8.8 RMQ APR 26.9440 8.3 SJZ MAY 07.0000 8.5 BXA APR 29.002 8.3 RMQ MAY 08.0000 8.8 BXA APR 29.1000 8.1 BXA MAY 08.0070 8.8 SJZ APR 29.995 8.2 RMQ MAY 08.022 8.5 PYG APR 30.069 8.4 PYG MAY 09.0000 9.0 BXA MAY 01.022 8.3 PYG MAY 09.074 8.9 MUY MAY 01.040 8.3 RMQ MAY 10.0000 9.1 BXA MAY 01.943 8.5 RMQ MAY 10.888 8.6 TUB MAY 02.044 8.3 PYG MAY 10.9640 8.8 SJZ MAY 02.961 8.5 RMQ MAY 11.0000 9.1 BXA MAY 03.939 8.7 RMQ MAY 11.977 9.1 RMQ ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BEB - R. BERG, USA PEX - A. PEARCE, AUSTRALIA BXA - A. BARANSKY, UKRAINE PYG - G. POYNER, ENGLAND DPV - P. DUBOVSKY, SLOVAKIA RMQ - M. RESZELSKI, POLAND FSE - S. FOGLIA, ITALY SJZ - J. SPEIL, POLAND KMA - M. KOMOROUS, CANADA SRX - R. STUBBINGS, AUSTRALIA MUY - E. MUYLLAERT, BELGIUM TUB - V. TUBOLY, HUNGARY 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! ____________________________________________________________________________