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: AF Cam, YZ Cnc, HL CMa, OY Car, AM Cas, No. 257 AY Lyr, V493 Lyr, CN Ori, ER UMa February 9, 1998 ________________________________________________________________________________ AF CAMELOPARDALIS The dwarf nova type cataclysmic variable AF Cam is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 03.833 <15.1 PYG FEB 08.0854 13.5 BRJ FEB 07.026 13.5 CGF FEB 08.9924 13.5 SWT FEB 07.1181 13.5 SWT ---------------------------------------------------------------------------- YZ CANCRI The dwarf nova type (SU UMa subclass) cataclysmic variable YZ Cnc is undergoing an outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 04.59030 14.8 SRX FEB 08.1020 13.42 CCDV ZRE FEB 06.52010 12.4 SRX FEB 08.5583 <11.9 SRX FEB 07.1493 12.5 SWT FEB 09.0250 <12.3 SWT FEB 07.1530 12.58 CCDV ZRE ---------------------------------------------------------------------------- HL CANIS MAJORIS The dwarf nova type (Z Cam subclass) cataclysmic variable HL CMa is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 01.199 14.1 MRV FEB 08.8210 11.7 BQM FEB 03.942 <13.7 PYG FEB 08.83 11.8 GUN FEB 04.51180 <13.7 SRX FEB 08.9944 11.5 DPL FEB 06.51040 11.6 SRX FEB 09.0069 11.3 SWT FEB 07.051 11.8 CGF FEB 09.0854 11.7 TSC FEB 08.1007 11.8 BRJ FEB 09.5014 11.7 SRX FEB 08.4743 11.6 SRX ---------------------------------------------------------------------------- OY CARINAE The dwarf nova type (SU UMa subclass) cataclysmic variable OY Car is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 08.4715 <14.1 SRX FEB 09.0717 12.0 OB FEB 08.750 <12.5 OB FEB 09.4938 11.8 SRX FEB 08.84 13.2 MLF FEB 09.6104 11.8 SRX ---------------------------------------------------------------------------- AM CASSIOPEIAE The dwarf nova type (Z Cam subclass) cataclysmic variable AM Cas is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 08.0826 <14.5 BRJ FEB 09.047 13.1 CGF FEB 08.9875 13.1 SWT FEB 09.0715 12.9 BRJ ---------------------------------------------------------------------------- AY LYRAE The dwarf nova type (SU UMa subclass) cataclysmic variable AY Lyr is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JAN 25.5333 <15.5 HSG FEB 09.20 13.6 GUN FEB 04.244 <14.4 PYG FEB 09.4240 13.75 CCDV ZRE ---------------------------------------------------------------------------- V493 LYRAE The dwarf nova type cataclysmic variable V493 Lyr appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials JAN 25.5340 <15.4 HSG FEB 07.261 13.7 WBK ---------------------------------------------------------------------------- CN ORIONIS The dwarf nova type (Z Cam subclass) cataclysmic variable CN Ori is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 02.0729 <13.3 DLA FEB 07.051 12.9 CGF FEB 02.851 <14.9 PYG FEB 08.0993 12.6 BRJ FEB 03.1539 <13.3 BEB FEB 08.9931 12.0 DPL FEB 03.56040 14.0 SRX FEB 09.0042 12.4 SWT FEB 03.938 <14.3 PYG FEB 09.0805 11.9 TSC FEB 04.50690 13.9 SRX FEB 09.4896 12.6 SRX FEB 06.50490 12.7 SRX FEB 09.4993 12.6 SRX ---------------------------------------------------------------------------- ER URSAE MAJORIS The dwarf nova type (SU UMa subclass) cataclysmic variable ER UMa appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 02.842 14.9 PYG FEB 08.0639 <14.0 BRJ FEB 03.874 15.1 PYG FEB 09.0903 13.8 BRJ ----------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BEB - R. Berg, USA MRV - R. Modic, USA BQM - M. Bignotti, Italy OB - D. Overbeek, South Africa BRJ - J. Bortle, USA PYG - G. Poyner, England CGF - G. Chaple, USA SRX - R. Stubbings, Australia DLA - A. Dill, USA SWT - R. Stewart, USA DPL - P. Dombrowski, USA TSC - S. Tracy, USA HSG - G. Hanson, USA WBK - B. Worraker, England MLF - B. Monard, 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 ________________________________________________________________________________ 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! _______________________________________________________________________________