THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS 25 Birch Street, Cambridge, MA 02138 USA Tel. 617-354-0484 Fax 617-354-0665 http://www.aavso.org * * * AAVSO NEWS FLASH * * * Subject: 0139+37 AR AND 2007+20 FG SGE No. 548 0206+57A TZ PER 2158+41 BL LAC December 21, 1999 ---------------------------------------------------------------------------- 0139+37 AR ANDROMEDAE The dwarf nova type cataclysmic variable AR AND appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 15.852 <13.9 MUY DEC 19.859 <14.8 PYG DEC 17.907 <14.8 PYG DEC 20.74 13.3 VET DEC 19.0882 <13.9 SXN DEC 20.788 12.8: MUY ---------------------------------------------------------------------------- 0206+57A TZ PERSEI The dwarf nova type (Z CAM subclass) cataclysmic variable TZ PER is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 17.9340 15.0 JCN DEC 19.968 14.6 PYG DEC 19.1833 <14.0: SXN DEC 20.790 13.8: MUY DEC 19.8097 14.3 JCN ---------------------------------------------------------------------------- 2007+20 FG SAGITTAE The unique variable FG SGE which had been faint is brightening,as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 13.751 14.0 PYG DEC 19.7333 13.3 JCN DEC 15.757 13.7 PYG DEC 19.776 13.5 PYG DEC 16.72 13.2 VET DEC 20.73 13.3 VET DEC 17.1146 13.0 CCDV RR DEC 21.017 12.9 MRV DEC 17.9715 13.0 BRJ ---------------------------------------------------------------------------- 2158+41 BL LACERTAE BL LAC (prototype of BL Lac type objects) continues to be active, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials DEC 17.1278 14.1 RR DEC 19.7889 14.2 JCN DEC 17.842 14.3 PYG DEC 19.808 13.9 PYG DEC 17.8951 14.4 JCN DEC 19.865 13.8 PYG DEC 19.0208 <14.3 SXN ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BRJ - J. BORTLE, USA RR - R. ROYER, USA JCN - C. JONES, ENGLAND SXN - M. SIMONSEN, USA MRV - R. MODIC, USA VET - M. VERDENET, FRANCE MUY - E. MUYLLAERT, BELGIUM PYG - G. POYNER, ENGLAND 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, Director Gamze Menali, Technical Assistant ____________________________________________________________________________ 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 visiting the following web page: http://www.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 An archive of past issues of the News Flash is available at the following web page: http://www.aavso.org/newsflash/ We look forward to including your observations in future editions of AAVSO NEWS FLASH! ____________________________________________________________________________