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: 0822+25 AT CNC 1640+25 AH HER No. 434 0915+51 SN 1999BY 1801-27 V4444 SGR May 7, 1999 ---------------------------------------------------------------------------- 0822+25 AT CANCRI The dwarf nova type (Z CAM subclass) cataclysmic variable AT CNC may be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 06.4014 13.5 SRX MAY 07.1917 12.7 BTH MAY 06.874 13.4 MUY ---------------------------------------------------------------------------- 0915+51 SN 1999BY Below is an update on the new supernova SN 1999by: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 06.872 13.7 MU MAY 07.292 13.4 MRV MAY 07.2167 13.5 RR ---------------------------------------------------------------------------- 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 MAY 01.1740 13.96 CCDV ZRE MAY 05.89 11.8 KTO MAY 01.259 14.4 MRV MAY 06.0972 11.4 BRJ MAY 01.89 13.1 KTO MAY 06.910 11.3 MUY MAY 02.1720 13.31 ZRE MAY 07.2396 11.4 BTH MAY 02.91 12.7 KTO MAY 07.385 11.4 MRV MAY 04.90 12.3 KTO ---------------------------------------------------------------------------- 1801-27 V4444 SAGITTARII Below is an update on the new, bright nova v4444 Sgr (N Sgr 99): AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 05.385 10.5 MRV MAY 07.351 11.1: MRV MAY 06.304 9.3 OCN MAY 07.367 12.5 MRV MAY 06.954 11.4: MLF ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BRJ - J. BORTLE, USA MUY - E. MUYLLAERT, BELGIUM BTH - T. BURROWS, USA OCN - S. O'CONNOR, CANADA KTO - T. KINNUNEN, FINLAND RR - R. ROYER, USA MLF - L. MONARD, SOUTH AFRICA SRX - R. STUBBINGS, AUSTRALIA MRV - R. MODIC, USA ZRE - R. ZISSELL, USA MU - A. MURPHY, 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 Kerriann Malatesta, 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! ____________________________________________________________________________