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: 2138+43 SS CYG 1544+28A R CRB No. 688 2158+41 BL LAC October 25, 2000 ----------------------------------------------------------------------------- NOTICE: News Flash mailings and Quick Look File updates will be temporarily suspended Thursday, October 26, 2000 through Tuesday, October 31,2000,due to staff involvement with the 89th Annual Meeting of the AAVSO. During this time, observers are asked to continue to report their observations to the AAVSO. Although the Quick Look file will not be updated during this period, the AAVSO technical staff will be periodically checking the observations for any activity. ----------------------------------------------------------------------------- 2138+43 SS CYG Astronomers with both FUSE and Chandra satellites are interested in observing the dwarf nova SS CYG during its next outburst. Immediate notification of the star's brightening and good coverage throughout the next outburst are extremely important for the triggering of the satellite observations and for correlation with the satellite data. Please report your observations, especially if you see SS CYG brighter than magnitude 11.5 ----------------------------------------------------------------------------- 1544+28A R CORONAE BOREALIS The R CRB prototype variable R CrB may be fading slightly, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials OCT 20.0833 6.4 COL OCT 22.759 6.5 PYG OCT 20.9868 6.3 DPL OCT 22.7604 6.7 VFK OCT 21.733 6.3 RMQ OCT 22.97 6.6 BRJ OCT 21.9791 6.4 BVE OCT 22.9756 6.3 DPL OCT 22.0194 6.5 KMA OCT 22.9861 6.6 KMA OCT 22.740 6.4 MUY OCT 23.7271 6.8 VFK OCT 22.757 6.3 RMQ OCT 24.0000 6.7 SET ---------------------------------------------------------------------------- 2158+41 BL LACERTAE BL LAC (prototype of BL LAC type objects) appears to be active, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials OCT 22.2063 14.4 SXN OCT 23.0799 14.4 SXN OCT 22.772 14.5: MUY OCT 23.806 14.4 MUY OCT 22.817 14.7 PYG OCT 23.8229 14.1 DPV OCT 22.824 14.3 RMQ OCT 23.931 14.5 RMQ OCT 22.8792 14.1 DPV OCT 24.895 13.8 OJR ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: MUY - E. MUYLLAERT, BELGIUM BRJ - J. BORTLE, USA OJR - J. OSORIO, SPAIN BVE - E. VAN BALLEGOIJ, NETHERLANDS PYG - G. POYNER, ENGLAND COL - P. COLLINS, USA RMQ - M. RESZELSKI, POLAND DPL - P. DOMBROWSKI, USA SET - C. STEPHAN, USA DPV - P. DUBOVSKY, SLOVAKIA SXN - M. SIMONSEN, USA KMA - M. KOMOROUS, CANADA VFK - F. VOHLA, GERMANY Please monitor these and other variable stars closely and phone-in, fax, or e-mail your observations to the AAVSO. Good observing! Gamze Menali, Technical Assistant Kerriann Malatesta, Technical Assistant On behalf of Janet A. Mattei, Director ____________________________________________________________________________ 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! ____________________________________________________________________________