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: 0945+34 RZ LMI 1813+49 AM HER No. 618 1552+72 SS UMI 1953+77 AB DRA May 11, 2000 ---------------------------------------------------------------------------- 0945+34 RZ LEONIS MINORIS The dwarf nova type (SU UMA subclass) cataclysmic variable RZ LMI may be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 06.1750 14.6 HSG MAY 10.1597 14.3 HSG MAY 07.2507 15.5: HSG MAY 11.2382 14.3 HSG MAY 07.939 <14.1 PYG ---------------------------------------------------------------------------- 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 MAY 10.4201 <15.8 HSG MAY 11.4660 14.4 HSG MAY 11.4076 14.4 HSG ---------------------------------------------------------------------------- 1813+49 AM HERCULIS The cataclysmic variable AM HER is brightening, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 04.4208 15.0 HSG MAY 07.985 14.3 PYG MAY 05.2556 14.1 HSG MAY 09.067 13.8 MUY MAY 05.4354 14.5 HSG MAY 09.4292 13.9 HSG MAY 05.9583 14.3 DPV MAY 09.9049 13.4 DPV MAY 05.973 13.7: MGH MAY 10.2236 13.9 HSG MAY 07.2580 14.1 CCDV ZRE MAY 11.4118 13.5 HSG MAY 07.2722 14.1 HSG ---------------------------------------------------------------------------- 1953+77 AB DRACONIS The dwarf nova type (Z CAM subclass) cataclysmic variable AB DRA appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 08.006 14.6 PYG MAY 10.4215 13.9 HSG MAY 09.060 13.8 MUY MAY 11.4083 12.8 HSG MAY 09.4285 13.7 HSG MAY 11.4660 12.7 HSG MAY 10.1632 13.9 HSG ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: DPV - P. DUBOVSKY, SLOVAKIA MUY - E. MUYLLAERT, BELGIUM HSG - G. HANSON II, USA PYG - G. POYNER, ENGLAND MGH - H. MCGEE, ENGLAND 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! 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! ____________________________________________________________________________