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: 0058+40 RX AND 0945+12 X LEO No. 435 0409-71 VW HYI 1109-37 V436 CEN May 10, 1999 0640-16 HL CMA 1801-27 V4444 SGR 0804+28 YZ CNC 1848+26 CY LYR 0854-41 CU VEL 1934+30 EM CYG 0915+51 SN 1999by 2026-45 TU IND ---------------------------------------------------------------------------- 0058+40 RX ANDROMEDAE The dwarf nova type (Z CAM subclass) cataclysmic variable RX AND is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 06.97 <13.0 KTO MAY 10.106 11.5 SPK MAY 08.97 10.9 KTO MAY 10.383 11.2 MRV MAY 09.104 11.1 SPK ---------------------------------------------------------------------------- 0409-71 VW HYDRI The dwarf nova type (SU UMA subclass) cataclysmic variable VW HYI is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 06.3903 12.7 SRX MAY 09.7854 8.8 SRX MAY 08.5826 11.5 SRX MAY 10.3826 8.9 SRX MAY 08.6854 11.4 SRX ---------------------------------------------------------------------------- 0640-16 HL CANIS MAJORIS The dwarf nova type (UG/UGZ subclass) cataclysmic variable HL CMA appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 06.3847 <13.7 SRX MAY 10.3681 11.6 SRX ---------------------------------------------------------------------------- 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 MAY 06.3743 <14.0 SRX MAY 10.0646 11.4 DPL MAY 08.2021 <12.3 BTH MAY 10.07 11.8 DGP MAY 09.2076 11.8 BTH MAY 10.1445 12.0 BEB MAY 09.868 12.9 SPK MAY 10.3701 12.1 SRX ---------------------------------------------------------------------------- 0854-41 CU VELORUM The dwarf nova type (SU UMA subclass) cataclysmic variable CU VEL is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 08.5319 <14.6 SRX MAY 09.713 12.3 OB MAY 09.701 12.3 OB MAY 10.3993 10.9 SRX ---------------------------------------------------------------------------- 0915+51 SN 1999by Below is an update on the new supernova SN 1999by: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 06.962 13.7 MGH MAY 08.895 13.1 OJR MAY 07.864 13.7 OJR MAY 09.1389 13.4 BTB MAY 07.87 13.4 KTO MAY 09.2222 13.2 BTH MAY 07.87 13.4 KTO MAY 09.75 13.6 TUB MAY 07.875 13.4 CCDV RZD MAY 09.9028 13.3 CMG MAY 08.2194 13.0 BTH MAY 10.0903 13.0 DPL MAY 08.8542 13.4 PUJ MAY 10.1986 13.0 RR MAY 08.876 13.4 MUY MAY 10.290 13.2 MRV ---------------------------------------------------------------------------- 0945+12 X LEONIS The dwarf nova type (UG subclass) cataclysmic variable X LEO is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 06.3986 <14.8 SRX MAY 10.1597 <12.4 SXN MAY 06.893 <13.5 MUY MAY 10.1646 12.7 BEB MAY 10.07 12.4 DGP MAY 10.3819 12.5 SRX MAY 10.0701 12.6 DPL ---------------------------------------------------------------------------- 1109-37 V436 CENTAURI The dwarf nova type (SU UMA subclass) cataclysmic variable V436 CEN is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 06.4111 15.0 SRX MAY 09.744 13.4 OB MAY 08.5875 12.4 SRX MAY 09.906 13.2 MLF MAY 09.715 13.4 OB MAY 10.4063 13.5 SRX ---------------------------------------------------------------------------- 1801-27 V4444 SAGITTARII Below is an update on the new, bright nova V4444 Sgr (N Sgr 99): AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 06.954 11.1 MLF MAY 09.04 11.2 MLF MAY 06.954 11.4: MLF MAY 09.04 11.5: MLF MAY 07.351 10.4 MRV MAY 09.982 11.1 MLF MAY 08.1200 11.1 AAA MAY 10.114 11.2 AAA MAY 08.6090 11.3: SRX MAY 10.367 10.9 MRV MAY 08.6090 10.8 SRX MAY 10.5132 10.9 SRX MAY 09.04 11.5: MLF NOTE: We have been informed by Robert J. Modic (MRV) that the estimate of 12.5 made on MAY 07.367 reported in News Flash 434 was actually an observation of N SGR 98, and not of V4444 SGR (N SGR 99) ---------------------------------------------------------------------------- 1848+26 CY LYRAE The dwarf nova type (UG subclass) cataclysmic variable CY LYR is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 05.96 <15.2 KTO MAY 08.968 13.2 OJR MAY 08.95 13.0 GUN MAY 08.98 13.0 KTO ---------------------------------------------------------------------------- 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 MAY 01.99 14.1 KTO MAY 05.94 12.6 KTO MAY 02.2560 14.2 CCDV ZRE MAY 08.97 13.0 KTO MAY 04.95 12.8 KTO ---------------------------------------------------------------------------- 2026-45 TU INDI The dwarf nova type (UG subclass) cataclysmic variable TU IND appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 26.7493 14.6 SRX MAY 09.8354 13.8 SRX MAY 08.5361 13.8 SRX MAY 10.5368 13.9 SRX MAY 08.6861 13.8 SRX ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: AAA - A. AVELINO, BRAZIL MUY - E. MUYLLAERT, BELGIUM BEB - R. BERG, USA OB - M. OVERBEEK, SOUTH AFRICA BTB - T. BRETL, USA OJR - J. OSORIO, SPAIN BTH - T. BURROWS, USA PUJ - F. PUJOL, SPAIN CMG - G. COMELLO, NETHERLANDS RR - R. ROYER, USA DGP - G. DYCK, USA RZD - D. RODRIGUEZ, SPAIN DPL - P. DOMBROWSKI, USA SPK - P. SCHMEER, GERMANY GUN - J. GUNTHER, FRANCE SRX - R. STUBBINGS, AUSTRALIA KTO - T. KINNUNEN, FINLAND SXN - M. SIMONSEN, USA MGH - H. MCGEE, ENGLAND TUB - V. TUBOLY, HUNGARY MLF - L. MONARD, SOUTH AFRICA ZRE - R. ZISSELL, USA MRV - R. MODIC, 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 Kerriann Malatesta, 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! ____________________________________________________________________________