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, V442 Cen, TU Crt, V503 Cyg, V516 Cyg, No. 278 V630 Cyg, WX Hyi, X Leo, HP Nor, V1159 Ori, March 24, 1998 VZ Pyx, UZ Ser, DI UMa, ER UMa ________________________________________________________________________________ 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 22.4354 <14.2 SRX MAR 24.0611 13.2 BRJ MAR 22.892 14.8: PYG MAR 24.1181 12.7 MKJ MAR 23.2535 <13.6 RR MAR 24.1360 12.79 CCDV ZRE MAR 23.865 13.9 BOS MAR 24.4292 12.0 SRX MAR 24.0382 13.1 DPL ----------------------------------------------------------------------------- V442 CENTAURI The dwarf nova type (SS Cyg subclass) cataclysmic variable V442 Cen is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 21.4500 <14.2 SRX MAR 23.754 12.2 OB MAR 22.4736 13.0 SRX MAR 23.791 12.3 MLF MAR 22.806 12.1 MLF MAR 24.4521 12.8 SRX ----------------------------------------------------------------------------- TU CRATERIS The dwarf nova type (SU UMa subclass) cataclysmic variable TU Crt is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 22.4694 <15.0 SRX MAR 24.5215 13.6 SRX MAR 23.29 <13.7 MLF MAR 24.5951 13.0 SRX MAR 24.4493 15.0 SRX MAR 24.6799 12.8 SRX MAR 24.4764 14.5 SRX MAR 24.7806 12.1 MLF MAR 24.5021 13.9 SRX ----------------------------------------------------------------------------- V503 CYGNI The dwarf nova type (SU UMa subclass) cataclysmic variable V503 Cyg is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 17.3910 18.20 CCDV ZRE MAR 24.3920 14.53 CCDV ZRE MAR 22.5090 <15.0 HSG MAR 24.4736 14.3 HSG ----------------------------------------------------------------------------- V516 CYGNI The dwarf nova type (SS Cyg subclass) cataclysmic variable V516 Cyg is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 17.4050 16.07 CCDV ZRE MAR 24.4050 14.22 CCDV ZRE MAR 22.5097 <14.2 HSG MAR 24.4743 14.2 HSG ----------------------------------------------------------------------------- V630 CYGNI The dwarf nova type cataclysmic variable V630 Cyg appears to be in outburst, as indicated by the following observation: AAVSO Observer UT Mag. Initials MAR 24.4757 14.8 HSG According to the AAVSO International Database this star is fainter than visual magnitude 15.6 during quiescence. ----------------------------------------------------------------------------- WX HYDRI The dwarf nova type (SU UMa subclass) cataclysmic variable WX Hyi appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials MAR 22.4312 14.7 SRX MAR 24.4153 12.8 SRX MAR 24.4674 12.8 SRX ----------------------------------------------------------------------------- X LEONIS The dwarf nova type cataclysmic variable X Leo is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 22.4403 <14.6 SRX MAR 24.0431 12.2 DPL MAR 22.965 <14.8 PYG MAR 24.0590 11.9 TSC MAR 23.2639 12.4 RR MAR 24.0653 12.3 BRJ MAR 23.8389 12.3 CMG MAR 24.1264 12.6 MKJ MAR 23.871 12.0 BOS MAR 24.4396 12.2 HSG MAR 24.01 12.1 DGP MAR 24.5028 12.3 SRX MAR 24.0250 12.0 SET ----------------------------------------------------------------------------- HP NORMAE The dwarf nova type (Z Cam subclass) cataclysmic variable HP Nor appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials MAR 19.5049 <14.0 SRX MAR 22.5708 13.2 SRX MAR 24.4743 14.5 SRX ----------------------------------------------------------------------------- V1159 ORIONIS The dwarf nova type (SU UMa subclass) cataclysmic variable V1159 Ori is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 19.1292 14.8 HSG MAR 22.4340 12.7 SRX MAR 19.4382 14.7 SRX MAR 22.829 12.8 PYG MAR 19.838 14.5 PYG MAR 24.0243 12.8 DPL MAR 20.4187 13.6 SRX MAR 24.0360 13.17 CCDV ZRE MAR 20.8 13.3 VET MAR 24.0576 13.0 BRJ MAR 21.4243 12.7 SRX MAR 24.4236 12.7 SRX ----------------------------------------------------------------------------- VZ PYXIDIS The dwarf nova type (SU UMa subclass) cataclysmic variable VZ Pyx is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 21.4181 <15.0 SRX MAR 22.6625 13.0 SRX MAR 22.4417 14.6 SRX MAR 23.822 12.7 MLF MAR 22.5590 14.2 SRX MAR 24.4146 13.3 SRX ----------------------------------------------------------------------------- UZ SERPENTIS The dwarf nova type (possible Z Cam subclass) cataclysmic variable UZ Ser appears to be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials MAR 18.6625 <13.6 SRX MAR 24.6535 13.5 SRX According to the AAVSO International Database this star is fainter than visual magnitude 14.8 during quiescence. ----------------------------------------------------------------------------- DI URSAE MAJORIS The dwarf nova type cataclysmic variable DI UMa is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 19.1563 <15.5 HSG MAR 22.863 14.9 PYG MAR 19.869 <15.3 PYG MAR 23.888 15.0 BOS MAR 21.963 15.0 PYG MAR 24.4486 15.0 HSG ----------------------------------------------------------------------------- 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 UT Mag. Initials MAR 22.4792 <14.1 HSG MAR 22.862 15.1 PYG MAR 24.4493 13.2 HSG ----------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BOS - E. Broens, Belgium OB - D. Overbeek, South Africa BRJ - J. Bortle, USA PYG - G. Poyner, England CMG - G. Comello, Holland RR - R. Royer, USA DGP - G. Dyck, USA SET - C. Stephan, USA DPL - P. Dombrowski, USA SRX - R. Stubbings, Australia HSG - G. Hanson, USA TSC - S. Tracy, USA MKJ - J. McKenna, USA VET - M. Verdenet, France 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! _______________________________________________________________________________