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: 0058+40 RX AND 0956+34 RU LMI No. 582 0641+28 IR GEM 1051+50 CY UMA February 28, 2000 0804+28 YZ CNC 1344+08 CR BOO 0822+25 AT CNC 1640+25 AH HER 0854-24 VZ PYX 1830+24A CH HER 0855+18 SY CNC 1841+37 AY LYR 0939+52 ER UMA ---------------------------------------------------------------------------- 0058+40 RX ANDROMEDAE The dwarf nova type (Z CAM subclass) cataclysmic variable RX AND is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 23.77 14.3 VET FEB 26.80 11.6 RCH FEB 25.1139 12.9 HSG FEB 26.802 12.0 MUY FEB 25.786 12.3 MUY FEB 26.81 11.6 GUN FEB 25.798 12.3 PYG FEB 27.0972 11.5 KB FEB 25.81 12.0 GUN FEB 27.1069 11.2 HSG FEB 25.8243 12.4 POX FEB 27.78 10.7 VET FEB 26.1049 12.1 HSG FEB 28.0972 11.0 KB FEB 26.78 11.8 VET FEB 28.0972 11.0 KB ---------------------------------------------------------------------------- 0641+28 IR GEMINORUM The dwarf nova type (SU UMA subclass) cataclysmic variable IR GEM is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 27.1250 <16.0 HSG FEB 27.9283 13.57 CCD DRG FEB 27.81 13.1 VET FEB 28.1550 <13.6 BEB FEB 27.8620 13.69 CCD DRG FEB 28.2847 13.5 SXN ---------------------------------------------------------------------------- 0804+28 YZ CANCRI The dwarf nova type (SU UMA subclass) cataclysmic variable YZ CNC is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 25.901 14.4 PYG FEB 27.4444 11.9 SRX FEB 26.1313 15.2: HSG FEB 27.5021 12.0 SSU FEB 26.80 12.6 VET FEB 27.81 12.0 VET FEB 26.82 13.0: GUN FEB 27.8708 12.14 CCD DRG FEB 26.843 12.9 MUY FEB 28.1451 11.9 BEB FEB 27.1278 12.0 HSG FEB 28.3063 11.7 SXN ---------------------------------------------------------------------------- 0822+25 AT CANCRI The dwarf nova type (Z CAM subclass) cataclysmic variable AT CNC is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 25.8215 13.8 POX FEB 26.844 13.5 MUY FEB 25.872 13.6 MUY FEB 27.4903 13.5 SRX FEB 25.904 13.5 PYG FEB 28.3083 13.0 SXN ---------------------------------------------------------------------------- 0854-24 VZ PYXIDIS The dwarf nova type (SU UMA subclass) cataclysmic variable VZ PYX appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 26.800 14.8 MLF FEB 27.5917 13.0 SRX FEB 27.4319 13.9 SRX ---------------------------------------------------------------------------- 0855+18 SY CANCRI The dwarf nova type (Z CAM subclass) cataclysmic variable SY CNC appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 25.877 13.3 MUY FEB 27.1285 12.9 HSG FEB 25.905 13.3 PYG FEB 27.4910 12.9 SRX FEB 26.1319 13.4 HSG FEB 27.81 12.4 VET FEB 26.847 13.3 MUY FEB 28.1563 13.0 BEB FEB 26.98 13.0 GGX FEB 28.3201 12.8 SXN ---------------------------------------------------------------------------- 0939+52 ER URSAE MAJORIS The dwarf nova type (SU UMA subclass) cataclysmic variable ER UMA appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 27.1347 14.8 HSG FEB 28.3806 12.9 SXN ---------------------------------------------------------------------------- 0956+34 RU LEONIS MINORIS The dwarf nova type cataclysmic variable RU LMI appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 25.922 <15.5 PYG FEB 27.1313 14.7 HSG FEB 26.1340 <14.8 HSG FEB 28.3347 <14.2 SXN FEB 26.5028 14.8 HSG ---------------------------------------------------------------------------- 1051+50 CY URSAE MAJORIS The dwarf nova type (SU UMA subclass) cataclysmic variable CY UMA is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 09.2380 18.17 CCDV ZRE FEB 26.1417 13.5 HSG FEB 11.2451 <15.6 HSG FEB 26.5021 13.8 HSG FEB 16.982 <14.8 PYG FEB 26.859 13.9 MUY FEB 21.906 <14.4 PYG FEB 27.0993 14.3 HSG FEB 25.824 13.0 SPK FEB 27.1361 14.3 HSG FEB 25.839 12.9 MUY FEB 27.2292 14.5 HSG FEB 25.869 13.3 PYG FEB 27.4986 15.1 HSG FEB 25.9500 13.8 POX FEB 28.1897 <14.0 BEB FEB 26.0993 13.3 HSG FEB 28.3958 <14.6 SXN ---------------------------------------------------------------------------- 1344+08 CR BOOTIS The variable star CR BOO may be active, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 11.5542 <15.4 HSG FEB 26.5076 14.0 HSG FEB 15.3431 <14.1 SXN FEB 27.4993 14.0 HSG FEB 17.422 14.5 CCDV OCN FEB 28.4403 <14.1 SXN FEB 21.3299 <13.8 SXN ---------------------------------------------------------------------------- 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 FEB 22.3180 14.24 CCDV ZRE FEB 27.206 13.8 MUY FEB 23.3310 14.16 CCDV ZRE FEB 27.5063 13.3 HSG FEB 26.097 14.0 PYG FEB 28.15 13.0 VET FEB 26.5118 14.1 HSG ---------------------------------------------------------------------------- 1830+24A CH HERCULIS The dwarf nova type cataclysmic variable CH HER appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 07.5125 <15.1 HSG FEB 26.5146 15.0: HSG FEB 08.4257 <13.6 SXN FEB 27.5083 14.9 HSG ---------------------------------------------------------------------------- 1841+37 AY LYRAE The dwarf nova type (SU UMA subclass) cataclysmic variable AY LYR is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 11.5479 <15.5 HSG FEB 27.01 13.2 GUN FEB 14.167 <14.2 MGH FEB 27.211 13.2 MUY FEB 16.228 <14.2 MUY FEB 27.5111 13.2 HSG FEB 17.229 13.8 MUY FEB 28.16 13.7 VET FEB 26.5188 13.1 HSG ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BEB - R. BERG, USA POX - M. POXON, ENGLAND DRG - R. DIETHELM, SWITZERLAND PYG - G. POYNER, ENGLAND GGX - G. GUZMAN, FRANCE RCH - C. RAMILLON, FRANCE GUN - J. GUNTHER, FRANCE SPK - P. SCHMEER, GERMANY HSG - G. HANSON II, USA SRX - R. STUBBINGS, AUSTRALIA KB - W. KAMINSKI, USA SSU - S. SAKUMA, JAPAN MGH - H. MCGEE, ENGLAND SXN - M. SIMONSEN, USA MLF - L. MONARD, SOUTH AFRICA VET - M. VERDENET, FRANCE MUY - E. MUYLLAERT, BELGIUM ZRE - R. ZISSELL, USA OCN - S. O'CONNOR, CANADA 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! ____________________________________________________________________________