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: 0409-71 VW HYI 0945+12 X LEO No. 1146 0518+00 BI ORI 1017-49 V383 VEL April 22, 2003 0742-52 V436 CAR 1454+41 TT BOO 0803+62 SU UMA 1523+62 ES DRA 0804+28 YZ CNC 2138+43 SS CYG ---------------------------------------------------------------------------- 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 18.3780 13.9 SRX APR 20.5990 13.2 SRX APR 19.4220 13.9 SRX APR 20.9563 <11.3 AAX APR 20.4320 13.3 SRX APR 22.3960 10.3 SRX ---------------------------------------------------------------------------- 0518+00 BI ORIONIS The dwarf nova type cataclysmic variable BI ORI appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 03.1791 <16.2 CCDV SFK APR 10.0625 16.66 CCDV GKA APR 03.4110 <14.8 SRX APR 11.0549 17.74 CCDV GKA APR 05.4110 <14.8 SRX APR 19.3800 14.4 SRX APR 06.0681 <15.1 CCDV GKA APR 20.3800 14.3 SRX APR 06.2722 <15.5 LMK APR 22.3940 14.3 SRX APR 10.0528 <13.6 TDB ---------------------------------------------------------------------------- 0742-52 V436 CARINAE The dwarf nova type cataclysmic variable V436 CAR may be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAR 27.8200 <14.7 MLF APR 05.4080 14.6 SRX MAR 30.7700 <14.7 MLF APR 20.4410 14.5 SRX MAR 31.7480 14.6 CCDR MLF ---------------------------------------------------------------------------- 0803+62 SU URSAE MAJORIS The dwarf nova type (SU UMA subclass prototype) cataclysmic variable SU UMA appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 15.1264 15.08 CCDV GKA APR 19.9028 12.3 VJA APR 16.9010 14.7 PYG APR 20.1250 12.2 CGF APR 18.1000 <13.4 CGF APR 21.1292 12.1 CGF APR 18.8900 14.7 PYG APR 21.8660 13.2 OJR APR 18.9118 <12.7 GMY APR 21.8903 12.0 VJA ---------------------------------------------------------------------------- 0804+28 YZ CANCRI The dwarf nova type (SU UMA subclass) cataclysmic variable YZ CNC appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 20.0451 <14.3 DPL APR 21.1063 14.0 CGF APR 20.0770 14.64 CCDV ZRE APR 21.8417 11.3 GUN APR 20.1000 14.4 CGF APR 21.8701 11.7 OJR APR 20.2500 <13.8 LMK APR 22.3900 11.9 SRX APR 20.3750 14.6 SRX ---------------------------------------------------------------------------- 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 APR 20.0556 <14.2 DPL APR 21.3257 13.0: LMK APR 20.1000 <14.3 CGF APR 21.8472 12.0 GUN APR 20.1993 15.9 CCDV RR APR 21.8958 <14.3 VJA APR 20.2639 <15.0 LMK APR 21.9060 12.0 MGH APR 20.3890 <14.6 SRX APR 22.3312 12.1 LMK APR 21.1000 <14.3 CGF APR 22.4080 12.4 SRX ---------------------------------------------------------------------------- 1017-49 V383 VELORUM The dwarf nova type cataclysmic variable V383 VEL appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 10.4510 <14.4 SRX APR 17.4660 12.6 SRX APR 11.4030 <14.0 SRX APR 18.3770 12.6 SRX APR 13.7370 <14.0 SRX APR 19.4000 12.7 SRX APR 15.4320 <13.0 SRX APR 20.3990 12.7 SRX APR 16.4170 <12.7 SRX APR 22.4210 12.9 SRX ---------------------------------------------------------------------------- 1454+41 TT BOOTIS The dwarf nova type (SU UMA subclass) cataclysmic variable TT BOO appears to be brightening, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 16.9280 <14.8 PYG APR 21.1347 12.8 CGF APR 18.8900 <13.8 MGH APR 21.9049 13.5 VJA APR 18.9167 <13.8 GCO APR 21.9190 <13.8 MGH APR 18.9280 <14.8 PYG APR 22.3472 13.7 LMK APR 20.1000 <13.9 CGF ---------------------------------------------------------------------------- 1523+62 ES DRACONIS The dwarf nova type cataclysmic variable ES DRA appears to be brightening, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 02.9730 15.5: PYG APR 09.0310 15.4: PYG APR 06.9250 <14.9 POX APR 10.2201 <14.9 SXN APR 08.0010 15.4 PYG APR 18.9340 14.8 PYG ---------------------------------------------------------------------------- 2138+43 SS CYGNI The dwarf nova type (SS CYG subclass prototype) cataclysmic variable SS CYG appears to be brightening, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 15.0763 11.9 OCR APR 19.0300 10.7 GRL APR 15.0810 12.0 SJZ APR 19.9340 10.7 VJA APR 15.3382 11.9 KMA APR 20.1229 10.4 CPS APR 17.0694 12.0 OCR APR 20.9965 10.1 ABG APR 17.9722 11.8 ABG APR 21.0604 10.1 CPS APR 17.9729 12.0 BVE APR 21.0900 9.8 GRL APR 18.0600 11.7 GRL APR 21.1090 9.9 OCR APR 19.0292 10.8 CPS APR 21.4104 9.9 CGF ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: AAX - A. AMORIM, BRAZIL MLF - I. MONARD, SOUTH AFRICA ABG - B. ANDRESEN, NORWAY OCR - C. OTTEN, BELGIUM BVE - E. VAN BALLEGOIJ, NETHERLANDS OJR - J. OSORIO, SPAIN CGF - G. CHAPLE JR., USA POX - M. POXON, ENGLAND CPS - P. CLOESEN, BELGIUM PYG - G. POYNER, ENGLAND DPL - P. DOMBROWSKI, USA RR - R. ROYER, USA GCO - C. GUALDONI, ITALY SFK - F. SCHEDER, USA GKA - K. GRAHAM, USA SJZ - J. SPEIL, POLAND GMY - M. GLENNON, IRELAND SRX - R. STUBBINGS, AUSTRALIA GRL - B. GRANSLO, NORWAY SXN - M. SIMONSEN, USA GUN - J. GUNTHER, FRANCE TDB - D. TAYLOR, CANADA KMA - M. KOMOROUS, CANADA VJA - J. VIRTANEN, FINLAND LMK - M. LINNOLT, USA ZRE - R. ZISSELL, USA MGH - H. MCGEE, ENGLAND 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 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! ____________________________________________________________________________