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: 0109+37 FO AND 1841+43 V344 LYR No. 482 0206+57A TZ PER 1951-09 UU AQL August 16, 1999 0605+47 SS AUR 1953+77 AB DRA 1508+23 NY SER 2043+41 V516 CYG 1640+25 AH HER 2138+43 SS CYG 1805-14 UZ SER 2244-27 TY PSA ---------------------------------------------------------------------------- 0109+37 FO ANDROMEDAE The dwarf nova type (SU UMA subclass) cataclysmic variable FO AND appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials AUG 15.046 14.4 PYG AUG 15.962 14.3 PYG According to the AAVSO International Database this star is fainter than visual magnitude 15.4 during quiescence. ---------------------------------------------------------------------------- 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 AUG 11.945 <14.0 MUY AUG 15.064 12.8 PYG AUG 14.0000 12.6 DPV AUG 15.920 12.6 DPV AUG 15.010 12.6 DPV AUG 16.060 12.7 PYG ---------------------------------------------------------------------------- 0605+47 SS AURIGAE The dwarf nova type cataclysmic variable SS AUR appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials AUG 04.3580 15.86 CCDV ZRE AUG 15.99 10.8 GUN AUG 14.49 12.3 GUN ---------------------------------------------------------------------------- 1508+23 NY SERPENTIS The dwarf nova type cataclysmic variable NY SER may be in outburst, as indicated by the following observations: AAVSO Observer UT Mag. Initials AUG 15.889 14.8 PYG According to the AAVSO International Database this star is fainter than visual magnitude 15.5 during quiescence. ---------------------------------------------------------------------------- 1640+25 AH HERCULIS The dwarf nova type (Z CAM subclass) cataclysmic variable AH HER is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials AUG 14.924 13.6 PYG AUG 15.85 13.0 GUN AUG 15.1458 13.9: SXN AUG 15.901 13.2 PYG AUG 15.2083 12.8 BTH AUG 16.1500 12.7 SXN AUG 15.8 12.7 VET AUG 16.3299 12.4 SQN AUG 15.840 12.7 DPV ---------------------------------------------------------------------------- 1805-14 UZ SERPENTIS The dwarf nova type (possible Z CAM subclass) cataclysmic variable UZ SER is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials AUG 13.1236 15.70 CCDV WGR AUG 14.5958 13.8 SRX AUG 13.2118 <15.3 HSG AUG 15.8 12.8 VET AUG 14.4042 14.6 SRX AUG 16.174 13.0 OCN ---------------------------------------------------------------------------- 1841+43 V344 LYRAE The dwarf nova type (SU UMA subclass) cataclysmic variable V344 LYR appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials AUG 14.950 <15.8 PYG AUG 16.035 14.6 PYG ---------------------------------------------------------------------------- 1951-09 UU AQUILAE The dwarf nova type cataclysmic variable UU AQL may be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials AUG 13.2139 17.43 CCDV WGR AUG 15.875 14.2: DPV AUG 13.2472 <15.4 HSG AUG 16.3583 14.3: SQN AUG 15.029 <15.4 PYG ---------------------------------------------------------------------------- 1953+77 AB DRACONIS The dwarf nova type (Z CAM subclass) cataclysmic variable AB DRA is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials AUG 13.2278 14.7 HSG AUG 15.1896 12.7 KMA AUG 14.2722 12.6 BTH AUG 15.2403 12.7 BTH AUG 14.8972 12.8 JCN AUG 15.847 12.6 DPV AUG 14.942 12.8 PYG AUG 15.908 12.9 PYG AUG 14.951 12.6 DPV ---------------------------------------------------------------------------- 2043+41 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 AUG 13.2350 17.04 CCDV ZRE AUG 15.2597 13.6 BTH AUG 13.2569 17.41 CCDV WGR AUG 15.988 14.3 PYG AUG 14.969 <15.5 PYG ---------------------------------------------------------------------------- 2138+43 SS CYGNI The dwarf nova type (SS CYG subclass prototype) cataclysmic variable SS CYG appears to be brightening, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials AUG 13.8569 12.1 FSE AUG 15.3326 11.3 SXN AUG 13.93 11.7 VET AUG 15.8 11.4 GGX AUG 14.2799 11.5 BTH AUG 15.850 11.2 DPV AUG 14.9375 11.0 MED AUG 16.050 11.4 PYG AUG 14.979 11.9 PYG AUG 16.0604 11.1 KMA AUG 15.020 11.6 DPV AUG 16.0743 11.2 MDP AUG 15.0950 12.0 GMB AUG 16.1146 11.1 MDP AUG 15.1528 11.1 KMA AUG 16.1460 10.7: GMB AUG 15.2785 10.8 BTH AUG 16.2868 10.7 SXN ---------------------------------------------------------------------------- 2244-27 TY PISCIS AUSTRINI The dwarf nova type (SU UMA subclass) cataclysmic variable TY PSA is undergoing an outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials AUG 10.307 <15.0 OCN AUG 14.4028 12.0 SRX AUG 11.4743 <14.0 SRX AUG 14.5896 12.5 SRX AUG 13.7653 11.9 SRX AUG 15.271 13.0 OCN AUG 13.7799 11.9 SRX AUG 16.234 14.4 OCN AUG 14.061 12.1 MLF ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BTH - T. BURROWS, USA MLF - L. MONARD, SOUTH AFRICA DPV - P. DUBOVSKY, SLOVAKIA MUY - E. MUYLLAERT, BELGIUM FSE - S. FOGLIA, ITALY OCN - S. O'CONNOR, CANADA GGX - G. GUZMAN, FRANCE PYG - G. POYNER, ENGLAND GMB - M. GABLE, USA SQN - L. SHAW, USA GUN - J. GUNTHER, FRANCE SRX - R. STUBBINGS, AUSTRALIA HSG - G. HANSON II, USA SXN - M. SIMONSEN, USA JCN - C. JONES, ENGLAND VET - M. VERDENET, FRANCE KMA - M. KOMOROUS, CANADA WGR - G. WALKER, USA MDP - P. MCDONALD, CANADA ZRE - R. ZISSELL, USA MED - K. MEDWAY, 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 Rebecca Pellock, 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! ____________________________________________________________________________