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: Z Cam, YZ Cnc, HL CMa, EM Cyg, No. 282 V811 Cyg, UV Gem, AG Hya, V478 Sco March 31, 1998 ________________________________________________________________________________ Z CAMELOPARDALIS The dwarf nova type (Z Cam subclass prototype) cataclysmic variable Z Cam is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 29.0819 13.0 KMA MAR 30.8681 11.8 CMG MAR 29.1 12.9 CGF MAR 30.951 11.5 PYG MAR 30.0757 12.4 CGF MAR 31.103 11.5 CGF MAR 30.310 12.7 MRV MAR 31.4597 11.2 HSG ----------------------------------------------------------------------------- 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 MAR 30.0880 15.14 CCDV ZRE MAR 31.1458 14.0 HSG MAR 30.4854 <14.2 SRX MAR 31.4868 13.3 SRX MAR 30.900 14.5: PYG ----------------------------------------------------------------------------- HL CANIS MAJORIS The dwarf nova type (Z Cam subclass) cataclysmic variable HL CMa appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials MAR 27.4312 <14.0 SRX MAR 31.1194 13.9 HSG MAR 31.4701 11.9 SRX ----------------------------------------------------------------------------- EM CYGNI The dwarf nova type (Z Cam subclass) cataclysmic variable EM Cyg is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 25.4590 14.2 HSG MAR 31.110 12.8 PYG MAR 28.04 13.4 GRL MAR 31.4715 12.5 HSG ----------------------------------------------------------------------------- V811 CYGNI The dwarf nova type (SS Cyg subclass) cataclysmic variable V811 Cyg appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials MAR 25.4611 <14.8 HSG MAR 31.4736 14.2 HSG According to the AAVSO International Database this star is fainter than visual magnitude 15.5 during quiescence. ----------------------------------------------------------------------------- UV GEMINORUM The dwarf nova type cataclysmic variable UV Gem appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials MAR 25.1375 <15.2 HSG MAR 31.1438 14.2 HSG MAR 31.2028 14.3 HSG ----------------------------------------------------------------------------- AG HYDRAE The dwarf nova type cataclysmic variable AG Hya appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials MAR 27.4528 <15.2 SRX MAR 31.4750 14.4 SRX MAR 31.4917 14.5 SRX ----------------------------------------------------------------------------- V478 SCORPII The dwarf nova type cataclysmic variable V478 Sco appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials MAR 27.6465 <14.8 SRX MAR 31.5799 14.5 SRX According to the AAVSO International Database this star is fainter than visual magnitude 15.5 during quiescence. ----------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: CGF - G. Chaple, USA KMA - M. A. Komorous, Canada CMG - G. Comello, Holland MRV - R. Modic, USA DLA - A. Dill, USA PYG - G. Poyner, England GRL - B. Granslo, Norway SRX - R. Stubbings, USA HSG - G. Hanson, USA ZRE - R. Zissell 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 ________________________________________________________________________________ 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! ______________________________________________________________________________