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: 0409-71 VW HYI 1612-54 HP NOR No. 424 0725+06 SV CMI 1615-59 RT NOR April 15, 1999 0956+34 RU LMI 1640+25 AH HER 1140-03 TW VIR ---------------------------------------------------------------------------- 0409-71 VW HYDRI The dwarf nova type (SU UMA subclass) cataclysmic variable VW HYI is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 11.4416 13.9 WPX APR 14.4083 11.0 TJN APR 13.4528 13.0 TJN APR 15.707 9.9 OB ---------------------------------------------------------------------------- 0725+06 SV CANIS MINORIS The dwarf nova type (Z CAM subclass) cataclysmic variable SV CMI appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 14.06 <15.0 BRJ APR 15.0674 13.3 BRJ ---------------------------------------------------------------------------- 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 APR 14.919 <15.3 PYG APR 15.1889 14.6 HSG APR 15.1444 14.7 HSG ---------------------------------------------------------------------------- 1140-03 TW VIRGINIS The dwarf nova type cataclysmic variable TW VIR appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 13.2590 15.0 COO APR 15.1868 13.7 HSG APR 14.1563 14.8 HSG ---------------------------------------------------------------------------- 1612-54 HP NORMAE The dwarf nova type (Z CAM subclass) cataclysmic variable HP NOR appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 12.826 15.2 PEX APR 14.988 12.9 OB APR 14.951 13.2 OB ---------------------------------------------------------------------------- 1615-59 RT NORMAE The R CrB type variable star RT NOR appears to be fading, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 09.0 11.2 OB APR 14.954 12.3 OB APR 10.1 11.5 OB ---------------------------------------------------------------------------- 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 13.03 14.5 KTO APR 14.2010 13.34 CCDV ZRE APR 13.2950 13.92 CCDV ZRE APR 14.3280 12.88 CCDV ZRE APR 13.989 13.6 PYG APR 15.008 13.0 PYG ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BRJ - J. BORTLE, USA PEX - A. PEARCE, AUSTRALIA COO - L. COOK, USA PYG - G. POYNER, ENGLAND HSG - G. HANSON II, USA TJN - J. TILBROOK, AUSTRALIA KTO - T. KINNUNEN, FINLAND WPX - P. WILLIAMS, NEW ZEALAND OB - M. OVERBEEK, SOUTH AFRICA 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! ____________________________________________________________________________