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: 1813-25B GM SGR 0217+70 AM CAS No. 497 0130+50 KT PER 0401+50 FO PER September 16, 1999 ---------------------------------------------------------------------------- 1813-25B GM SAGITTARII The X-ray source GM SGR has experienced a brief and very bright outburst (see also IAU Circular No. 7253 and 7254.) An X-ray flare was detected in the same area on FEB 20.59 UT (IAUC No. 7119.) At that time it was proposed that GM Sgr was the optical counterpart of the X-ray source. Below are the recent observations of GM Sgr that we have received at AAVSO Headquarters: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials AUG 11.4875 12.3 SRX SEP 14.749 11.4 MLF AUG 14.4361 12.5 SRX SEP 14.776 11.1 MLF AUG 29.4243 12.7 SRX SEP 14.788 11.1 MLF AUG 31.4958 13.0 SRX SEP 15.3951 8.8 SRX SEP 09.4618 11.2 SRX SEP 15.4076 8.8 SRX SEP 10.4139 11.2 SRX SEP 15.550 9.5 PEX SEP 10.4736 11.2 SRX SEP 15.571 9.6 PEX SEP 11.5993 11.9 SRX SEP 15.700 10.3 MLF SEP 12.4090 11.1 SRX SEP 15.733 10.5 MLF SEP 12.4764 11.2 SRX SEP 15.778 10.7 MLF SEP 13.3965 11.9 SRX SEP 15.825 11.3 MLF SEP 13.730 12.3 MLF SEP 15.860 11.4 MLF SEP 14.4910 11.4 SRX SEP 15.891 11.5 MLF SEP 14.5167 11.4 SRX SEP 15.927 11.6 MLF SEP 14.715 11.7 MLF SEP 16.708 13.7 MLF An AAVSO preliminary 'd' scale chart has been issued and is posted on the AAVSO web page at the following address: http://charts.aavso.org/prelim/SGR/GM_SGR/ A more detailed chart for GM Sgr is forthcoming. Please monitor this very interesting object to watch for further activity. ---------------------------------------------------------------------------- 0130+50 KT PERSEI The dwarf nova type (Z CAM subclass) cataclysmic variable KT PER is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials SEP 14.920 14.4: DPV SEP 16.2079 12.5 BEB SEP 15.2410 13.0 SXN SEP 16.2083 11.8 SXN SEP 15.947 12.2 DPV SEP 16.965 12.7 OJR ---------------------------------------------------------------------------- 0217+70 AM CASSIOPEIAE The dwarf nova type (Z CAM subclass) cataclysmic variable AM CAS is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials SEP 11.2860 14.8 NRH SEP 15.954 13.6 DPV SEP 11.913 <14.2 MUY SEP 16.1833 13.7 HSG SEP 13.878 <13.5 MUY SEP 16.958 13.2 OJR SEP 14.2329 <12.9 BEB ---------------------------------------------------------------------------- 0401+50 FO PERSEI The dwarf nova type cataclysmic variable FO PER appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials SEP 12.3070 17.11 CCDV ZRE SEP 16.3076 13.1 SXN ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BEB - R. BERG, USA OJR - J. OSORIO, SPAIN DPV - P. DUBOVSKY, SLOVAKIA PEX - A. PEARCE, AUSTRALIA HSG - G. HANSON II, USA SRX - R. STUBBINGS, AUSTRALIA MLF - L. MONARD, SOUTH AFRICA SXN - M. SIMONSEN, USA MUY - E. MUYLLAERT, BELGIUM ZRE - R. ZISSELL, USA NRH - R. NELSON, 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 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! ____________________________________________________________________________