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, TT Crt, X Leo No. 242 December 31, 1997 ________________________________________________________________________________ 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 DEC 28.3243 <14.9 HSG DEC 29.2480 15.28 CCDV ZRE DEC 28.5576 <14.2 SRX DEC 30.5736 12.0 SRX DEC 29.107 14.3 PYG DEC 31.5083 12.0 SRX ----------------------------------------------------------------------------- TT CRATERIS The dwarf nova type cataclysmic variable TT Crt is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 24.6278 <14.0 SRX DEC 30.5757 13.4 SRX DEC 26.6090 13.2 SRX DEC 31.5403 13.5 SRX DEC 28.6167 13.2 SRX The last outburst of this star to be recorded in the AAVSO International Database was in late April 1997 (see AAVSO News Flash 140). ----------------------------------------------------------------------------- X LEONIS The dwarf nova type (SS Cyg subclass) cataclysmic variable X Leo appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 27.3250 15.6 CCDV RR DEC 30.5625 <14.1 SRX DEC 28.3278 <14.9 HSG DEC 31.6215 13.2 SRX DEC 29.119 <14.8 PYG ----------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: HSG - G. Hanson, USA SRX - R. Stubbings, Australia PYG - G. Poyner, England ZRE - R. Zissell, USA RR - R. Royer, USA Please monitor these and other variable stars closely and phone-in, fax, or e-mail your observations to the AAVSO. Good observing! Happy New Year! 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! ______________________________________________________________________________