THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS 25 Birch Street, Cambridge, MA 02138 USA Tel. 617-354-0484 Fax 617-354-0665 INTERNET: aavso@aavso.org * * * AAVSO NEWS FLASH * * * Subject: YZ Cnc, AT Cnc, AM Cas, GX Cas, No. 290 AB Dra, SU UMa April 24, 1998 ____________________________________________________________________________ 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 APR 22.0960 15.82 CCDV ZRE APR 23.918 12.1 OJR APR 22.9694 <14.2 BMM APR 24.1167 11.9 BEB ---------------------------------------------------------------------------- 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 APR 20.886 14.9 PYG APR 22.9604 13.1 BMM APR 22.3944 <14.5 SRX APR 23.4076 13.0 SRX ---------------------------------------------------------------------------- AM CASSIOPEIAE The dwarf nova type (Z Cam subclass) cataclysmic variable AM Cas appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials APR 22.4514 <14.5 HSG APR 23.4576 13.8 HSG APR 24.4451 13.3 HSG ---------------------------------------------------------------------------- GX CASSIOPEIAE The dwarf nova type (SU UMa subclass) cataclysmic variable GX Cas appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials APR 23.4556 <14.5 HSG APR 24.4438 13.8 HSG ---------------------------------------------------------------------------- AB DRACONIS The dwarf nova type (Z Cam subclass) cataclysmic variable AB Dra is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 22.1056 13.7 BRJ APR 23.4181 13.5 HSG APR 22.3640 14.3 CCDV ZRE APR 24.2498 12.8 BEB APR 22.4188 13.6 HSG APR 24.4090 12.7 HSG APR 23.0674 13.8 BMM ---------------------------------------------------------------------------- SU URSAE MAJORIS The dwarf nova type (SU UMa subclass prototype) cataclysmic variable SU UMa is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 21.1931 14.8: HSG APR 24.1331 12.5 BEB APR 22.4153 13.0 HSG APR 24.4028 12.9 HSG APR 23.4139 12.2 HSG APR 28.1223 12.3 DKS APR 23.920 12.4 OJR ----------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BEB - R. Berg, USA OJR - J. Ripero Osorio, Spain BMM - M. Biesmans, Belgium PYG - G. Poyner, England BRJ - J. Bortle, USA SRX - R. Stubbings, Australia DKS - S. Dvorak, USA ZRE - R. Zissell, USA HSG - G. Hanson, 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 sending a message to: observations@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 We look forward to including your observations in future editions of AAVSO NEWS FLASH! ___________________________________________________________________________