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: 0006-12 WW CET 1813-25B V4641 SGR No. 966 0207-63 WX HYI 1911-00 FO AQL May 20, 2002 0855+18 SY CNC 1925+42 V1504 CYG 1621+39 V844 HER ---------------------------------------------------------------------------- 0006-12 WW CETI The dwarf nova type (possible Z CAM subclass) cataclysmic variable WW CET is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 13.7370 <13.1 SRX MAY 20.7360 10.7 SRX MAY 17.1367 10.9 SJX MAY 20.7469 10.7 SRX MAY 19.1423 10.9 SJX MAY 20.7809 10.7 SRX ---------------------------------------------------------------------------- 0207-63 WX HYDRI The dwarf nova type (SU UMA subclass) cataclysmic variable WX HYI appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 13.3610 <14.0 SRX MAY 16.3790 <13.2 SRX MAY 14.3919 <13.7 SRX MAY 19.6830 12.8 SRX MAY 15.6899 <13.0 SRX MAY 20.7420 13.9 SRX ---------------------------------------------------------------------------- 0855+18 SY CANCRI The dwarf nova type (Z CAM subclass) cataclysmic variable SY CNC is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 11.8539 13.5 VOL MAY 16.8670 12.28 CCD DRG MAY 13.3829 13.4 SRX MAY 18.1458 10.7 GTN MAY 14.3980 12.9 SRX ---------------------------------------------------------------------------- 1621+39 V844 HERCULIS The dwarf nova type cataclysmic variable V844 HER is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 17.9188 <15.6 RMQ MAY 19.4194 12.3 LMK MAY 18.9309 12.5 MGH MAY 20.4380 12.5 LMK MAY 19.2867 12.5 SXN ---------------------------------------------------------------------------- 1813-25B V4641 SAGITTARII The x-ray nova dwarf nova V4641 SGR is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 15.6439 13.4 SRX MAY 19.7230 11.5 SRX MAY 17.5690 13.4 SRX MAY 20.4290 12.2 LMK MAY 19.6990 11.5 SRX MAY 20.4763 12.6 LMK MAY 19.7039 11.5 SRX MAY 20.7349 12.8 SRX MAY 19.7160 11.5 SRX ---------------------------------------------------------------------------- 1911-00 FO AQUILAE The dwarf nova type (SS CYG subclass) cataclysmic variable FO AQL is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 17.9451 <14.8 RMQ MAY 19.6809 13.8 SRX MAY 19.3431 13.6 SXN MAY 20.4457 14.0 LMK ---------------------------------------------------------------------------- 1925+42 V1504 CYGNI The dwarf nova type (SU UMA subclass) cataclysmic variable V1504 CYG appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 17.0978 18.5 CCD DRG MAY 18.0117 15.8 RMQ ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: DRG - R. DIETHELM, SWITZERLAND SJX - J. SMIT, SOUTH AFRICA GTN - T. GANDET, USA SRX - R. STUBBINGS, AUSTRALIA LMK - M. LINNOLT, USA SXN - M. SIMONSEN, USA MGH - H. MCGEE, ENGLAND VOL - W. VOLLMANN, AUSTRIA RMQ - M. RESZELSKI, POLAND 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! ____________________________________________________________________________