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: 1846-01D N? AQL 00 1521+08 QW SER No. 612 0409-71 VW HYI 1640+25 AH HER May 1, 2000 0716+28 AW GEM 1920+52 V1113 CYG 0804+28 YZ CNC 1934+30 EM CYG 0945+12 X LEO 1953+77 AB DRA 1120-35 V442 CEN 2138+43 SS CYG 1338-07 HS VIR ---------------------------------------------------------------------------- 1846-01D PROBABLE NOVA IN AQUILA = CI AQUILAE?? We have been informed by the Central Bureau for Astronomical Telegrams (IAU Circular 7409) that Kesao Takamizawa, Japan, discovered an apparent nova photographically at magnitude 10.0 on Apr. 28.669 and 28.673 Ut. Tai-ichi Kato, Japan, reported that Minoru Yamamoto, Japan, independently discovered the object on Apr. 28.694 UT at photographic magnitude 9.8. H. Yamaoka, Japan, (IAU Circular 7411) measured a CCD(V) image obtained by K. Ayani and K. Shirakami and reported the position of the object as: R.A. = 18h 52m 03.55s Decl. = -01 degree 28' 38.9" (equinox 2000.0) This new object is extremely close to the position of CI Aql, which was discovered as an possible nova in 1917. No additional rebrightenings of CI Aql have been observed, and it is not clear whether the star currently in outburst is CI Aql or a different star. For more information, AAVSO observations of this object, and an AAVSO "d" scale Preliminary chart please see AAVSO Alert Notice 274 which will shortly be available via the AAVSO web site: http://www.aavso.org Congratulations to Kesao Takamizawa and Minoru Yamamoto on their discoveries of this probable nova! ---------------------------------------------------------------------------- 0409-71 VW HYDRI The dwarf nova type (SU UMA subclass) cataclysmic variable VW HYI appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 30.3917 13.6 SRX MAY 01.4118 10.3 SRX ---------------------------------------------------------------------------- 0716+28 AW GEMINORUM The dwarf nova type (SU UMA subclass) cataclysmic variable AW GEM is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 30.1493 <16.0 HSG MAY 01.1424 12.8 HSG APR 30.3938 <13.0 SRX MAY 01.1951 12.9 HSG APR 30.86 13.3 VET MAY 01.2236 12.8 HSG APR 30.89 13.3 VET MAY 01.3889 12.5 SRX MAY 01.0729 12.9 BRJ ---------------------------------------------------------------------------- 0804+28 YZ CANCRI The dwarf nova type (SU UMA subclass) cataclysmic variable YZ CNC is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 27.3972 <14.2 SRX APR 29.85 12.1 VET APR 27.8611 14.2: DPV APR 29.9090 12.4 DPV APR 28.1155 <13.3 BEB APR 30.1340 13.0 SXN APR 28.1611 13.1 HSG APR 30.1514 13.1 HSG APR 28.2340 12.8 HSG APR 30.299 12.7: LMK APR 28.3889 12.1 SRX APR 30.3931 13.1 SRX APR 29.0681 11.8 BRJ APR 30.86 13.5 VET APR 29.281 12.2 LMK MAY 01.0750 14.1 BRJ APR 29.3986 12.1 SRX MAY 01.1370 14.50 CCDV ZRE APR 29.8 12.0 GUN MAY 01.1958 14.0 HSG ---------------------------------------------------------------------------- 0945+12 X LEONIS The dwarf nova type cataclysmic variable X LEO is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 29.07 <15.0 BRJ APR 30.3042 12.2 LMK APR 29.4118 14.8 SRX APR 30.3854 12.0 LMK APR 29.4549 14.6 SRX APR 30.4090 12.3 SRX APR 29.8 12.4 GUN APR 30.87 12.3 VET APR 29.85 12.6 VET APR 30.901 12.4 PYG APR 29.855 12.9 RMQ APR 30.985 12.3 RMQ APR 29.9167 12.6 DPV MAY 01.0625 12.2 CGF APR 29.927 12.7 PYG MAY 01.0785 12.0 DPL APR 30.1100 <12.4 GMB MAY 01.0792 12.6 BRJ APR 30.1326 12.4 KB MAY 01.0958 12.6 MKJ APR 30.1486 12.2 SXN MAY 01.1861 12.6 ABB APR 30.1535 12.2 HSG MAY 01.1993 12.3 HSG APR 30.1625 12.2 MKJ MAY 01.2097 12.1 CCDV RR APR 30.2535 11.9 AAP MAY 01.4028 12.3 SRX ---------------------------------------------------------------------------- 1120-35 V442 CENTAURI The dwarf nova type (SS CYG subclass) cataclysmic variable V442 CEN is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 28.4118 14.6 SRX APR 29.818 12.5 HJN APR 28.802 <13.2 HJN APR 30.4139 12.8 SRX APR 29.4160 12.6 SRX MAY 01.4090 12.8 SRX ---------------------------------------------------------------------------- 1338-07 HS VIRGINIS The dwarf nova type cataclysmic variable HS VIR appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 29.4361 <14.8 SRX MAY 01.4396 14.4 SRX APR 30.4333 14.0 SRX ---------------------------------------------------------------------------- 1521+08 QW SERPENTIS (TMZ V46) The dwarf nova type cataclysmic variable QW SER appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 30.346 18.0: CCD SPK MAY 01.301 13.1 CCD SPK ---------------------------------------------------------------------------- 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 APR 29.0847 14.1 BRJ APR 30.4271 13.0 HSG APR 29.87 13.8 VET APR 30.88 12.4 VET APR 29.89 13.0 GUN MAY 01.008 13.0 PYG APR 29.89 13.0 VET MAY 01.009 12.3 RMQ APR 29.91 12.7 VET MAY 01.06 12.4 VET APR 29.956 12.6 RMQ MAY 01.0882 13.1 BRJ APR 30.029 13.6 PYG MAY 01.0938 12.3 DPL APR 30.0486 13.2 DPV MAY 01.1670 12.88 CCDV ZRE APR 30.2201 13.2 HSG MAY 01.2056 12.8 HSG APR 30.2681 13.0 SXN ---------------------------------------------------------------------------- 1920+52 V1113 CYGNI The dwarf nova type (SS CYG subclass) cataclysmic variable V1113 CYG appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 23.080 <15.6 PYG APR 30.069 14.1 PYG APR 24.012 <14.0 MGH MAY 01.022 14.2 PYG APR 27.1944 <13.9 SXN ---------------------------------------------------------------------------- 1934+30 EM CYGNI The dwarf nova type (Z CAM subclass) cataclysmic variable EM CYG is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 24.011 13.9 RMQ APR 30.091 12.9 PYG APR 26.900 13.7 RMQ APR 30.4396 12.4 HSG APR 26.9688 13.4 DPV APR 30.995 12.7 RMQ APR 27.9375 13.4 DPV MAY 01.0736 12.5 DPV APR 28.989 13.7 RMQ MAY 01.08 12.5 VET APR 28.9931 13.2 DPV MAY 01.081 12.7 PYG APR 29.989 13.6 RMQ ---------------------------------------------------------------------------- 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 APR 30.2049 14.3 HSG MAY 01.0715 12.8 CGF APR 30.922 13.8 PYG MAY 01.0903 12.9 BRJ MAY 01.004 12.6 RMQ MAY 01.2063 12.7 HSG ---------------------------------------------------------------------------- 2138+43 SS CYGNI The dwarf nova type (SS CYG subclass prototype) cataclysmic variable SS CYG appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 27.0440 12.0 SJZ APR 30.4472 11.8 HSG APR 27.3264 11.8 KMA MAY 01.0764 11.6 DPV APR 27.9660 12.0 DPV MAY 01.08 11.5 VET APR 28.0000 12.1 DPV MAY 01.085 11.9 PYG APR 28.3917 11.4 HK MAY 01.3299 11.0 HK APR 30.101 12.1 PYG MAY 01.3410 10.6 SCE ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: AAP - A. ABBOTT, CANADA LMK - M. LINNOLT, USA ABB - B. ADAMS, USA MGH - H. MCGEE, ENGLAND BEB - R. BERG, USA MKJ - J. MCKENNA, USA BRJ - J. BORTLE, USA OB - M. OVERBEEK, SOUTH AFRICA CGF - G. CHAPLE JR., USA PYG - G. POYNER, ENGLAND DPL - P. DOMBROWSKI, USA RMQ - M. RESZELSKI, POLAND DPV - P. DUBOVSKY, SLOVAKIA RR - R. ROYER, USA GMB - M. GABLE, USA SCE - C. SCOVIL, USA GUN - J. GUNTHER, FRANCE SJZ - J. SPEIL, POLAND HJN - J. HERS, SOUTH AFRICA SPK - P. SCHMEER, GERMANY HK - E. HALBACH, USA SRX - R. STUBBINGS, AUSTRALIA HSG - G. HANSON II, USA SXN - M. SIMONSEN, USA KB - W. KAMINSKI, USA VET - M. VERDENET, FRANCE KMA - M. KOMOROUS, CANADA ZRE - R. ZISSELL, USA 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! ____________________________________________________________________________