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: 1903-50 SUPERNOVA 2000do No. 679 0130+31 TW TRI 1848+26 CY LYR October 2, 2000 0206+57A TZ PER 1848-19 FN SGR 0207-63 WX HYI 2023+43 V503 CYG 0401+50 FO PER 2043+41 V516 CYG 0611+15 CZ ORI 2131+39 V632 CYG 0945+12 X LEO 2335+12 HX PEG ---------------------------------------------------------------------------- 1903-50 SUPERNOVA 2000do in NGC 6754 in TELESCOPIUM We have been informed by the Central Bureau for Astronomical Telegrams (IAU Circular 7500) that Brett White, Linden, NSW, Australia, visually discovered a supernova in NGC 6754 on September 30.5 UT, using an 0.5-m f/4.8 reflector. Measurement of a CCD image taken by C. Bembrick, Walang, NSW, on September 30.58 UT using an 0.41-m reflector + CCD, and reported by R. Evans, Hazelbrook, NSW, shows SN 2000do, which is 4.5" east and 7.6" north of the center of NGC 6754, located at: R.A. = 19h 11m 26.19s Decl. = -50 degrees 38' 24.5" (2000.0) G. L. White, Nepean Centre for Astronomy, Kingswood, NSW, reports that a blue-enhanced (with infrared blocker) CCD image taken by T. Dobosz on September 30.53 UT shows the supernova at magnitude 15.6 and located at position end figures 26.33s, 24.3", which is in the galaxy arm and about 7.9" east and 7.4" north of the galaxy nucleus. Spectroscopy obtained by T. Chandar and H. Ford, Johns Hopkins University, on September 30.98 UT using the Cerro Tololo Interamerican Observatory (CTIO) 1.5-m facility spectrograph and CCD camera, and reported by N. B. Suntzeff, CTIO, indicates SN 2000do to be a Type Ia supernova at or a few days after maximum. An AAVSO preliminary chart showing this supernova is being prepared and will be posted on the AAVSO website. Congratulations to Brett on his latest discovery! ---------------------------------------------------------------------------- 0130+31 TW TRIANGULI The dwarf nova type (Z CAM subclass) cataclysmic variable TW TRI appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials SEP 29.906 <15.1 RMQ SEP 30.938 14.5 RMQ SEP 30.2507 <14.7 SXN OCT 01.885 14.1 RMQ SEP 30.931 <13.9 MUY ---------------------------------------------------------------------------- 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 SEP 30.9569 14.3 JCN OCT 01.8972 13.8 POX OCT 01.2590 14.3 HSG OCT 02.2583 13.5 HSG OCT 01.875 13.9 RMQ ---------------------------------------------------------------------------- 0207-63 WX HYDRI The dwarf nova type (SU UMA subclass) cataclysmic variable WX HYI appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials SEP 30.4611 14.5 WPX OCT 02.4437 12.1 WPX SEP 30.817 <13.7 PEX OCT 02.4631 12.1 WPX OCT 01.768 <13.7 PEX ---------------------------------------------------------------------------- 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 OCT 01.2611 <15.0 HSG OCT 02.2604 13.4 HSG ---------------------------------------------------------------------------- 0611+15 CZ ORIONIS The dwarf nova type cataclysmic variable CZ ORI is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials SEP 25.054 <15.0 RMQ SEP 30.0382 12.5 DPV SEP 27.177 <13.9 MUY SEP 30.3403 12.7 SXN SEP 27.756 <12.6 SRX SEP 30.869 12.3 PEX SEP 29.740 13.3 SRX OCT 01.835 12.6 PEX ---------------------------------------------------------------------------- 0945+12 X LEONIS The dwarf nova type cataclysmic variable X LEO appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials SEP 28.5208 <14.3 RR SEP 30.3909 12.9 DPL ---------------------------------------------------------------------------- 1848+26 CY LYRAE The dwarf nova type cataclysmic variable CY LYR is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials OCT 01.2319 <14.8 HSG OCT 01.9618 13.4 POX OCT 01.80 13.8 VET OCT 02.0104 13.3 CGF OCT 01.81 13.6 GUN OCT 02.0319 13.2 DKS OCT 01.859 13.7 RMQ OCT 02.1111 13.2 HSG ---------------------------------------------------------------------------- 1848-19 FN SAGITTARII (correction to News Flash No. 678) The text in News Flash No. 678 should have read: The Z AND type variable type FN SGR appears to be slowly fading, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials AUG 22.1 11.6 BRJ SEP 21.557 <13.0 PEX AUG 25.74 11.7 MLF SEP 22.03 12.6 BRJ AUG 26.1 11.7 BRJ SEP 23.01 12.6 BRJ AUG 30.882 11.9 MUY SEP 24.571 12.4 PEX AUG 31.1 11.7 BRJ SEP 25.558 12.4 PEX AUG 31.434 11.8 WPX SEP 27.0670 12.2 BEB SEP 01.0828 11.9 BEB SEP 27.72 12.8 MLF SEP 06.1 11.8 BRJ SEP 28.03 12.5 BRJ SEP 10.456 12.2 WPX SEP 29.01 12.6 BRJ SEP 17.0 12.5 BRJ SEP 29.0669 12.3 BEB SEP 17.73 12.1 MLF SEP 30.4333 12.2 WPX SEP 18.550 12.1 PEX SEP 30.566 12.3 PEX SEP 21.553 <13.0 PEX ---------------------------------------------------------------------------- 2023+43 V503 CYGNI The dwarf nova type (SU UMA subclass) cataclysmic variable V503 CYG appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials OCT 01.2417 <16.0 HSG OCT 02.2403 14.9 HSG ---------------------------------------------------------------------------- 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 OCT 01.2424 <15.5 HSG OCT 02.2410 14.8 HSG ---------------------------------------------------------------------------- 2131+39 V632 CYGNI The dwarf nova type (SS CYG subclass) cataclysmic variable V632 CYG appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials OCT 01.2431 <15.4 HSG OCT 02.2653 14.3 HSG OCT 02.2431 14.4 HSG ---------------------------------------------------------------------------- 2335+12 HX PEGASI The dwarf nova type cataclysmic variable HX PEG is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials SEP 30.2257 <14.8 SXN OCT 01.2472 13.4 HSG SEP 30.3076 <13.9 VPJ OCT 01.856 12.7 RMQ SEP 30.869 13.9: RMQ OCT 02.2472 13.1 HSG SEP 30.921 13.5 MUY ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BEB - R. BERG, USA MUY - E. MUYLLAERT, BELGIUM BRJ - J. BORTLE, USA PEX - A. PEARCE, AUSTRALIA CGF - G. CHAPLE JR., USA POX - M. POXON, ENGLAND DKS - S. DVORAK, USA RMQ - M. RESZELSKI, POLAND DPL - P. DOMBROWSKI, USA RR - R. ROYER, USA DPV - P. DUBOVSKY, SLOVAKIA SRX - R. STUBBINGS, AUSTRALIA GUN - J. GUNTHER, FRANCE SXN - M. SIMONSEN, USA HSG - G. HANSON II, USA VET - M. VERDENET, FRANCE JCN - C. JONES, ENGLAND VPJ - J. VAN POUCKER, USA MLF - L. MONARD, SOUTH AFRICA WPX - P. WILLIAMS, NEW ZEALAND 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! ____________________________________________________________________________