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: 0217+70 AM CAS 1841+37 AY LYR No. 322 1120-35 V442 CEN 1911-00 FO AQL July 21, 1998 1207-43 MU CEN 2043+41 V516 CYG ---------------------------------------------------------------------------- 0217+70 AM CASSIOPEIAE The dwarf nova type (Z CAM subclass) cataclysmic variable AM CAS appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUL 15.4250 <14.5 HSG JUL 20.103 14.2 CGF JUL 19.097 14.3 CGF JUL 21.092 14.0 CGF According to the AAVSO International Database this star is fainter than visual magnitude 15.0 during quiescence. ---------------------------------------------------------------------------- 1120-35 V442 CENTAURI The dwarf nova type (SS CYG subclass) cataclysmic variable V442 CEN appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUL 19.3750 <14.8 SRX JUL 21.4187 13.1 SRX ---------------------------------------------------------------------------- 1207-43 MU CENTAURI The dwarf nova type (SS CYG subclass) cataclysmic variable MU CEN appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUL 14.3840 15.0 SRX JUL 20.5542 <14.2 SRX JUL 16.4097 <14.2 SRX JUL 21.4125 14.2 SRX JUL 18.3833 14.9 SRX JUL 21.4965 14.2 SRX JUL 19.3764 14.7 SRX ---------------------------------------------------------------------------- 1841+37 AY LYRAE The dwarf nova type (SU UMA subclass) cataclysmic variable AY LYR is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUL 18.999 <15.3 PYG JUL 20.3403 <14.2 SQN JUL 19.973 <15.0 PYG JUL 20.9 13.9 VET JUL 20.1 <14.2 CGF JUL 21.088 13.4 CGF ---------------------------------------------------------------------------- 1911-00 FO AQUILAE The dwarf nova type (SS CYG subclass) cataclysmic variable FO AQL is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUL 15.2139 <15.4 HSG JUL 20.088 14.1 CGF JUL 17.966 <14.9 PYG JUL 21.102 13.7 CGF JUL 19.1 <14.5 CGF JUL 21.4271 13.7 SRX JUL 19.4479 <14.8 SRX JUL 21.4757 13.6 SRX ---------------------------------------------------------------------------- 2043+41 V516 CYGNI The dwarf nova type (SS CYG subclass) cataclysmic variable V516 CYG appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUL 17.992 <15.5 PYG JUL 20.3764 <14.2 SQN JUL 20.1 <14.2 CGF JUL 21.108 13.9 CGF ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: CGF - G. CHAPLE JR., USA SQN - L. SHAW, USA HSG - G. HANSON II, USA SRX - R. STUBBINGS, AUSTRALIA PYG - G. POYNER, ENGLAND VET - M. VERDENET, FRANCE 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! ____________________________________________________________________________