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: 0640-16 HL CMA 0846+58 BZ UMA No. 405 0741-12 UY PUP 0854-24 VZ PYX March 10, 1999 ---------------------------------------------------------------------------- 0640-16 HL CANIS MAJORIS The dwarf nova type (UG/UGZ subclass) cataclysmic variable HL CMA is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 06.1000 <14.4 HSG MAR 09.4611 13.7 SRX MAR 07.0986 14.2: HSG MAR 10.1035 11.6 HSG MAR 09.0354 13.5 TSC MAR 10.4340 11.6 SRX ---------------------------------------------------------------------------- 0741-12 UY PUPPIS The dwarf nova type (possible Z CAM subclass) cataclysmic variable UY PUP is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials FEB 27.179 15.0 OCN MAR 08.4375 14.4 SRX FEB 28.115 14.9 OCN MAR 09.4639 14.4 SRX MAR 06.1014 14.7: HSG MAR 10.1396 14.5 HSG MAR 07.1000 14.7: HSG MAR 10.4556 14.4 SRX MAR 07.4465 14.4 SRX ---------------------------------------------------------------------------- 0846+58 BZ URSAE MAJORIS The outburst of BZ UMa that was reported in News Flash No. 404 appears to be a superoutburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 06.1465 15.9: HSG MAR 09.788 10.4 MUY MAR 07.1326 <15.7 HSG MAR 10.1042 10.8: HSG MAR 08.944 14.1 OJR MAR 10.1410 10.8: HSG We encourage observers to monitor this star and report their observations to the AAVSO, with timings carried to 4 decimal places. It is recommended to observe this reported superoutburst of BZ UMa every 5 minutes for at least 3 to 4 hours in search of superhumps. According to the AAVSO International Database, the last recorded superoutburt of BZ UMa was on April 7, 1998 when the star reached magnitude 10.9 at maximum. ---------------------------------------------------------------------------- 0854-24 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 03.76 <13.8 MLF MAR 09.776 12.8 MLF MAR 09.4236 15.1 SRX MAR 10.4333 12.8 SRX ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: HSG - G. HANSON II, USA OJR - J. OSORIO, SPAIN MLF - L. MONARD, SOUTH AFRICA SRX - R. STUBBINGS, AUSTRALIA MUY - E. MUYLLAERT, BELGIUM TSC - S. TRACY, USA OCN - S. O'CONNOR, CANADA 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 Kerriann Malatesta, 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! ____________________________________________________________________________