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: 0109+37 FO AND 1454+41 TT BOO No. 640 0130+50 KT PER 1803+05 V426 OPH July 5, 2000 0207-63 WX HYI 1804+67 EX DRA 0217+70 AM CAS 1830+24A CH HER 0401+50 FO PER 1934+30 EM CYG 0409-71 VW HYI 2043+41 V516 CYG ---------------------------------------------------------------------------- 0109+37 FO ANDROMEDAE The dwarf nova type (SU UMA subclass) cataclysmic variable FO AND may be going into outburst, as indicated by the following observation: AAVSO Observer UT Mag. Initials JUL 05.4257 15.7 HSG ---------------------------------------------------------------------------- 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 JUL 04.008 13.0 MUY JUL 05.4285 12.8 HSG ---------------------------------------------------------------------------- 0207-63 WX HYDRI The dwarf nova type (SU UMA subclass) cataclysmic variable WX HYI is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUL 02.6320 14.3 CR JUL 04.576 12.8 SRX JUL 02.639 <13.8 SRX JUL 04.8889 12.6 PEX ---------------------------------------------------------------------------- 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 JUL 03.1 <14.2 CGF JUL 05.1542 12.7 CGF JUL 03.4243 15.4: HSG JUL 05.2639 12.7 HSG JUL 04.003 <13.5 MUY JUL 05.4236 12.7 HSG ---------------------------------------------------------------------------- 0401+50 FO PERSEI The dwarf nova type (UG subclass) 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 JUL 02.4569 13.2 HSG JUL 05.4313 13.7 HSG JUL 03.4340 13.5 HSG ---------------------------------------------------------------------------- 0409-71 VW HYDRI The dwarf nova type (SU UMA subclass) cataclysmic variable VW HYI is undergoing an outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 29.1 <12.9 OB JUL 02.6370 10.2 CR JUN 29.378 13.7 SRX JUL 03.447 10.3 SRX JUL 02.369 10.3 SRX JUL 04.398 12.5 SRX ---------------------------------------------------------------------------- 1454+41 TT BOOTIS The dwarf nova type (SU UMA subclass) cataclysmic variable TT BOO is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUL 02.001 <13.9 MGH JUL 03.13 13.0 DGP JUL 02.1 <13.9 CGF JUL 03.1806 12.8 HSG JUL 02.1424 <13.9 MKJ JUL 03.895 12.6 OJR JUL 02.8993 12.9 DPV JUL 03.931 12.6 MUY JUL 02.938 12.8 RMQ JUL 04.1382 12.8 HSG JUL 02.996 12.8 RMQ JUL 04.875 12.7 OJR JUL 03.0903 13.3 CGF JUL 04.90 12.5 GUN JUL 03.1208 12.5 DKS JUL 05.2319 12.8 HSG ---------------------------------------------------------------------------- 1803+05 V426 OPHIUCHI The dwarf nova type cataclysmic variable V426 OPH is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 28.940 12.8 MUY JUL 02.1146 11.8 BRJ JUN 29.9271 12.7 DPV JUL 02.441 11.0 SRX JUN 30.1729 12.4 SXN JUL 02.9063 11.8 DPV JUL 01.1965 12.4 SXN JUL 03.954 11.7 MUY JUL 02.012 11.5 MGH ---------------------------------------------------------------------------- 1804+67 EX DRACONIS The eclipsing dwarf nova type cataclysmic variable EX DRA is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 25.1819 15.1 HSG JUL 02.1257 14.3 BRJ JUN 25.319 <14.6 LMK JUL 02.1354 <14.5 CGF JUN 25.917 15.0 RMQ JUL 02.2035 13.2 CCDV ZRE JUN 25.950 <14.5 MUY JUL 02.4278 13.2 HSG JUN 26.951 <14.5 MUY JUL 02.925 13.4 RMQ JUN 26.999 <14.8 PYG JUL 03.1083 13.4 CGF JUN 27.376 <14.0 LMK JUL 03.1750 14.2 HSG JUN 28.1819 13.90 CCDV ZRE JUL 03.1840 <15.3 HSG JUN 28.952 13.9 MUY JUL 03.1972 15.0 HSG JUN 29.3542 13.4 LMK JUL 03.2771 13.9 HSG JUN 29.4319 13.2 LMK JUL 03.4181 13.9 HSG JUN 29.4368 13.1 LMK JUL 03.943 14.1 MUY JUN 29.4972 13.2 LMK JUL 04.1319 14.4 HSG JUL 01.1125 13.6 CGF JUL 05.2236 15.0 HSG JUL 01.1271 14.1 BRJ ---------------------------------------------------------------------------- 1830+24A CH HERCULIS The dwarf nova type cataclysmic variable CH HER is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUN 25.1931 <16.0 HSG JUL 01.1160 14.4 BRJ JUN 26.2049 <14.0 SXN JUL 01.2000 14.5 SXN JUN 26.992 <15.1 PYG JUL 02.1174 14.4 BRJ JUN 27.970 <14.0 OJR JUL 02.4188 14.9 HSG JUN 28.303 <14.0 SXN JUL 02.964 15.1 RMQ JUN 30.1792 14.7 SXN JUL 03.1868 14.9 HSG JUN 30.2535 14.8 SXN JUL 04.1438 14.8 HSG JUN 30.2792 14.5 WSN JUL 05.2361 15.1 HSG JUN 30.90 14.2 VET ---------------------------------------------------------------------------- 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 JUN 25.344 14.1 LMK JUN 30.91 12.3 VET JUN 25.968 14.0 RMQ JUL 01.1215 12.4 BRJ JUN 25.974 14.0 MUY JUL 01.2514 12.5 SXN JUN 26.3007 14.0 SXN JUL 01.91 12.4 VET JUN 26.91 <13.9 GGX JUL 01.953 12.5 OJR JUN 26.974 13.9 MUY JUL 02.1208 12.4 BRJ JUN 27.035 13.7 PYG JUL 02.1544 12.3 BEB JUN 27.396 14.0 LMK JUL 02.1708 12.2 MKJ JUN 27.958 13.6 OJR JUL 02.4347 12.5 HSG JUN 27.9826 12.9 DPV JUL 02.9104 12.3 DPV JUN 28.2350 12.9 HZL JUL 02.92 12.0 MOI JUN 28.316 12.6 SXN JUL 02.975 12.5 RMQ JUN 28.91 12.4 VET JUL 03.1924 12.5 HSG JUN 28.963 12.4 MUY JUL 03.2590 12.7 CCDV ZRE JUN 29.3472 12.4 LMK JUL 03.966 12.5 MUY JUN 29.4514 12.4 LMK JUL 04.1493 12.5 HSG JUN 29.89 12.3 VET JUL 04.2368 12.1 RR JUN 29.9424 12.5 DPV JUL 04.89 12.0 GGX JUN 29.972 12.3 OJR JUL 05.1278 13.0 CGF JUN 30.2542 12.6 SXN JUL 05.2438 12.5 HSG ---------------------------------------------------------------------------- 2043+41 V516 CYGNI The dwarf nova type (SS CYG subclass) cataclysmic variable V516 CYG is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials JUL 03.1951 <15.5 HSG JUL 05.1097 13.8 CGF JUL 03.2370 15.61 CCDV ZRE JUL 05.2472 13.9 HSG JUL 04.1521 13.9 HSG ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BEB - R. BERG, USA MOI - E. MORILLON, FRANCE BRJ - J. BORTLE, USA MUY - E. MUYLLAERT, BELGIUM CGF - G. CHAPLE JR., USA OB - M. OVERBEEK, SOUTH AFRICA CR - T. CRAGG, AUSTRALIA OJR - J. OSORIO, SPAIN DGP - G. DYCK, USA PEX - A. PEARCE, AUSTRALIA DKS - S. DVORAK, USA PYG - G. POYNER, ENGLAND DPV - P. DUBOVSKY, SLOVAKIA RMQ - M. RESZELSKI, POLAND GGX - G. GUZMAN, FRANCE RR - R. ROYER, USA GUN - J. GUNTHER, FRANCE SRX - R. STUBBINGS, AUSTRALIA HSG - G. HANSON II, USA SXN - M. SIMONSEN, USA HZL - L. HAZEL, USA VET - M. VERDENET, FRANCE LMK - M. LINNOLT, USA WSN - T. WILSON, USA MGH - H. MCGEE, ENGLAND ZRE - R. ZISSELL, USA MKJ - J. MCKENNA, 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! ____________________________________________________________________________