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: RX And, FO And, YZ Cnc, AM Cas, No. 240 Z Cha, V516 Cyg, VW Hyi, CZ Ori, December 22, 1997 V1159 Ori, RU Peg, HX Peg, SU UMa ________________________________________________________________________________ RX ANDROMEDAE The dwarf nova type (Z Cam subclass) cataclysmic variable RX And is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 18.9986 14.0 BRJ DEC 21.999 11.0 CGF DEC 19.9938 13.9 DPL DEC 22.0000 10.6 TSC DEC 20.0 13.8 CGF DEC 22.0111 10.1 DPL DEC 20.0370 13.60 CCDV ZRE DEC 22.0243 11.2 BRJ DEC 20.0437 13.6 SWT DEC 22.0430 11.10 CCDV ZRE DEC 20.8757 11.2 CMG DEC 22.0868 10.5 SWT DEC 21.030 11.1 CGF DEC 22.089 10.8 MKJ DEC 21.0882 11.0 SWT DEC 22.0965 10.8 MDP DEC 21.4764 10.8 SSU ----------------------------------------------------------------------------- FO ANDROMEDAE The dwarf nova type cataclysmic variable FO And is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 20.0510 18.02 CCDV ZRE DEC 22.0264 15.1 BRJ DEC 21.0 <14.7 CGF DEC 22.0560 14.87 CCDV ZRE DEC 21.0910 <14.7 SWT DEC 22.0896 <14.0 SWT DEC 22.004 14.4 CGF ----------------------------------------------------------------------------- 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 17.4292 <14.2 HSG DEC 21.1410 12.8 SWT DEC 20.1153 <13.3 SWT DEC 22.1583 <13.6 SWT DEC 20.1670 15.33 CCDV ZRE DEC 22.2510 14.51 CCDV ZRE ----------------------------------------------------------------------------- AM CASSIOPEIAE The dwarf nova type (SS Cyg subclass) cataclysmic variable AM Cas is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 17.1125 14.5 HSG DEC 21.153 13.1 CGF DEC 20.0 15.2 CGF DEC 22.015 12.9 CGF DEC 20.0257 <13.5 SWT DEC 22.0368 13.6 BRJ DEC 21.0813 13.5 SWT DEC 22.0778 13.4 SWT ----------------------------------------------------------------------------- Z CHAMAELONIS 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 DEC 20.4833 <14.0 SRX DEC 22.5139 11.8 SRX ----------------------------------------------------------------------------- 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 DEC 16.1160 19.28 CCDV ZRE DEC 21.0653 <13.5 SWT DEC 17.0300 17.81 CCDV ZRE DEC 21.992 14.1 CGF DEC 17.0917 <15.5 HSG DEC 22.0010 13.87 CCDV ZRE DEC 21.0 <14.2 CGF DEC 22.0063 13.9 BRJ DEC 20.0050 18.26 CCDV ZRE ----------------------------------------------------------------------------- VW HYDRI The dwarf nova type (SU UMa subclass) cataclysmic variable VW Hyi is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 19.81 13.7 MLF DEC 21.764 9.9 OB DEC 20.4806 13.6 SRX DEC 21.779 10.0 MLF DEC 20.77 13.7 MLF DEC 22.4875 9.5 SRX DEC 20.8 <12.9 OB ----------------------------------------------------------------------------- CZ ORIONIS The dwarf nova type (SS Cyg subclass) cataclysmic variable CZ Ori is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 17.4236 <13.9 HSG DEC 21.186 12.2 CGF DEC 19.4875 12.5 SRX DEC 22.0625 12.1 BRJ DEC 20.070 12.6 CGF DEC 22.099 12.5 CGF DEC 20.0778 12.4 SWT DEC 22.1528 12.4 SWT DEC 20.4896 12.5 SRX DEC 22.4979 12.3 SRX DEC 21.1340 12.2 SWT ----------------------------------------------------------------------------- V1159 ORIONIS The dwarf nova type cataclysmic variable V1159 Ori is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 18.2440 14.84 CCDV ZRE DEC 22.0556 14.2 BRJ DEC 19.4840 14.7 SRX DEC 22.1479 13.8: SWT DEC 20.0736 <13.6 SWT DEC 22.1710 14.51 CCDV ZRE DEC 20.1160 14.29 CCDV ZRE DEC 22.2330 14.61 CCDV ZRE DEC 20.5028 13.6 SRX DEC 22.4958 14.7 SRX DEC 21.1243 13.1 SWT ----------------------------------------------------------------------------- RU PEGASI The dwarf nova type (SS Cyg subclass) cataclysmic variable RU Peg is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 17.0250 12.6 BEB DEC 21.3500 11.7 SSU DEC 17.1035 12.7 HSG DEC 21.9625 11.4 KMA DEC 17.9604 12.4 KMA DEC 21.9875 11.3 TSC DEC 18.0059 12.3 BEB DEC 21.997 11.5 CGF DEC 19.9896 12.2 DPL DEC 22.0000 11.7 BRJ DEC 20.0 12.5 CGF DEC 22.0076 11.4 DPL DEC 21.028 12.0 CGF DEC 22.021 11.4 MKJ ----------------------------------------------------------------------------- HX PEGASI The nova-like cataclysmic variable HX Peg is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 20.0 <14.0 CGF DEC 21.998 12.6 CGF DEC 21.027 13.0 CGF DEC 22.0014 13.5 BRJ ----------------------------------------------------------------------------- SU URSAE MAJORIS The dwarf nova type (SU UMa subclass prototype) cataclysmic variable SU UMa is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 17.4347 13.8 HSG DEC 20.1194 12.6 SWT DEC 18.208 14.0 MRV DEC 22.0500 13.4 BRJ DEC 19.0063 13.2 BRJ DEC 22.1646 13.2 SWT ----------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BEB - R. Berg, USA MLF - B. Monard, South Africa BRJ - J. Bortle, USA MRV - R. Modic, USA CGF - G. Chaple, USA OB - D. Overbeek, South Africa CMG - G. Comello, Netherlands SRX - R. Stubbings, Australia DPL - P. Dombrowski, USA SSU - S. Sakuma, Japan HSG - G. Hanson, USA SWT - R. Stewart, USA KMA - M. Komorous, Canada TSC - S. Tracy, USA MDP - P. McDonald, Canada ZRE - R. Zissell, USA MKJ - J. McKenna, 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! ______________________________________________________________________________