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: 0725+06 SV CMI 1640+25 AH HER No. 764 1058-21 TU CRT 1804+67 EX DRA April 9, 2001 1510+83 Z UMI ---------------------------------------------------------------------------- 0725+06 SV CANIS MINORIS The dwarf nova type (Z CAM subclass) cataclysmic variable SV CMI is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 31.2220 16.1 CCDV JM APR 05.8437 <13.0 RMQ APR 01.8818 16.71 DRG APR 09.0923 13.1 SXN APR 04.2743 <13.8 LMK APR 09.4100 13.3 SRX ---------------------------------------------------------------------------- 1058-21 TU CRATERIS The dwarf nova type (SU UMA subclass) cataclysmic variable TU CRT is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 30.9569 <14.8 MLF APR 08.5600 12.0: NLX APR 03.4939 <13.0 SRX APR 09.0632 12.2 SXN APR 03.5159 <13.5 NLX APR 09.1354 12.2 SXN APR 04.5150 <13.0 NLX APR 09.4079 12.4 SRX APR 05.4860 <13.0 SRX ---------------------------------------------------------------------------- 1510+83 Z URSAE MINORIS The R CrB type variable Z UMI is fading, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 01.7960 11.1 PYG MAR 21.1417 11.8 KMA MAR 01.9350 11.3 MGH MAR 21.9270 11.5 RMQ MAR 01.9542 11.1 RMQ MAR 26.8152 11.8 RMQ MAR 02.8539 11.2 PYG MAR 27.8527 11.8 RMQ MAR 02.9972 11.3 RMQ MAR 28.1882 11.3 MKE MAR 04.8080 11.2 PYG MAR 28.8881 12.0 RMQ MAR 05.8119 11.2 PYG MAR 30.1099 12.0 MGH MAR 06.8645 11.1 RMQ APR 02.1540 12.7 MGH MAR 12.8080 11.2 PYG APR 02.8138 12.5 RMQ MAR 13.8832 11.3 RMQ APR 04.2055 13.1 KMA MAR 13.9739 11.6 MGH APR 04.8509 12.8 PYG MAR 14.8130 11.3 PYG APR 05.8576 12.9 RMQ MAR 14.8777 11.3 RMQ APR 08.4215 <12.5 SXN MAR 15.9610 11.4 RMQ APR 09.1124 13.3 SXN MAR 16.9638 11.3 RMQ APR 09.1200 13.5 KMA MAR 20.9465 11.4 RMQ ---------------------------------------------------------------------------- 1640+25 AH HERCULIS The dwarf nova type (Z CAM subclass) cataclysmic variable AH HER appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 31.0833 <14.2 DPV APR 03.2839 13.72 CCDV ZRE APR 02.1288 13.78 CCD DRG APR 08.3506 12.0 SXN ---------------------------------------------------------------------------- 1804+67 EX DRACONIS The eclipsing dwarf nova type cataclysmic variable EX DRA appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 04.9360 <15.1 PYG APR 08.3319 13.0 SXN APR 05.8549 <13.8 RMQ ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: DPV - P. DUBOVSKY, SLOVAKIA MLF - I. MONARD, SOUTH AFRICA DRG - R. DIETHELM, SWITZERLAND NLX - P. NELSON, AUSTRALIA JM - R. JAMES, USA PYG - G. POYNER, ENGLAND KMA - M. KOMOROUS, CANADA RMQ - M. RESZELSKI, POLAND LMK - M. LINNOLT, USA SRX - R. STUBBINGS, AUSTRALIA MGH - H. MCGEE, ENGLAND SXN - M. SIMONSEN, USA MKE - R. MANSKE, USA 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! Rebecca Pellock, Technical Assistant on behalf of Janet A. Mattei, Director ____________________________________________________________________________ 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! ____________________________________________________________________________