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: 0547-05 CN ORI 1640+25 AH HER No. 605 0959+68 CH UMA April 14, 2000 ---------------------------------------------------------------------------- 0547-05 CN ORIONIS The dwarf nova type (Z CAM subclass) cataclysmic variable CN ORI appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 11.0361 14.4 SFK APR 12.285 13.1 LMK APR 11.4256 13.0 WPX ---------------------------------------------------------------------------- 0959+68 CH URSAE MAJORIS The dwarf nova type cataclysmic variable CH UMA appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 09.2361 <14.0 SXN APR 10.8694 <13.7 JCN APR 09.858 <13.7 MUY APR 10.871 <13.7 MUY APR 09.8694 14.8 JCN APR 12.897 <13.7 MUY APR 09.931 <13.7 MGH APR 14.12 12.5 GUN ---------------------------------------------------------------------------- 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 APR 11.1930 14.34 ZRE APR 13.933 12.0 RMQ APR 12.918 13.5: MUY APR 14.12 11.4 GUN ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: GUN - J. GUNTHER, FRANCE RMQ - M. RESZELSKI, POLAND JCN - C. JONES, ENGLAND SFK - F. SCHEDER, USA LMK - M. LINNOLT, USA SXN - M. SIMONSEN, USA MGH - H. MCGEE, ENGLAND WPX - P. WILLIAMS, NEW ZEALAND MUY - E. MUYLLAERT, BELGIUM 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! Gamze Menali, 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! ____________________________________________________________________________