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, MU Cen, Z Cha, AH Eri No. 260 February 13, 1998 ________________________________________________________________________________ YZ CANCRI The dwarf nova type (SU UMa subclass) cataclysmic variable YZ Cnc appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials FEB 08.1020 13.42 CCDV ZRE FEB 08.5583 <11.9 SRX FEB 09.0250 <12.3 SWT FEB 13.4715 12.4 SRX ----------------------------------------------------------------------------- MU CENTAURI The dwarf nova type (SS Cyg subclass) cataclysmic variable MU Cen appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials FEB 01.5188 <14.2 SRX FEB 10.6451 <13.5 SRX FEB 13.4847 13.5 SRX FEB 13.6167 13.6 SRX According to the AAVSO International Database this star is fainter than visual magnitude 15.0 during quiescence. ----------------------------------------------------------------------------- Z CHAMAELEONIS The dwarf nova type (SU UMa subclass) cataclysmic variable Z Cha appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials FEB 10.6292 <12.8 SRX FEB 13.4806 12.8 SRX FEB 13.5056 12.9 SRX FEB 13.6153 13.0 SRX According to the AAVSO International Database this star is fainter than visual magnitude 15.3 during quiescence. ----------------------------------------------------------------------------- AH ERIDANI The dwarf nova type cataclysmic variable AH Eri appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials FEB 09.4979 <14.0 SRX FEB 13.4576 14.0 SRX FEB 13.5028 14.0 SRX According to the AAVSO International Database this star is fainter than visual magnitude 16.5 during quiescence. ----------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: SRX - R. Stubbings, Australia SWT - R. Stewart, 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! 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! _______________________________________________________________________________