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: 0640-16 HL CMA 0905+51 DI UMA No. 425 0725+06 SV CMI 1140-03 TW VIR April 20, 1999 0744-23 BV PUP 1317-41 V803 CEN 0804+28 YZ CNC 1805-14 UZ SER 0814+73 Z CAM 1911-00 FO AQL 0855+18 SY CNC 1953+77 AB DRA ---------------------------------------------------------------------------- 0640-16 HL CANIS MAJORIS The dwarf nova type cataclysmic variable HL CMA is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 15.1264 <14.4 HSG APR 19.3958 11.6 SRX APR 18.3826 <13.0 SRX APR 20.1319 11.7 HSG ---------------------------------------------------------------------------- 0725+06 SV CANIS MINORIS The dwarf nova type (Z CAM subclass) cataclysmic variable SV CMI is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 14.06 <15.0 BRJ APR 16.852 13.3 MUY APR 15.0674 13.3 BRJ APR 18.3875 13.2 SRX APR 15.841 13.2 MUY APR 18.846 13.3 MUY ---------------------------------------------------------------------------- 0744-23 BV PUPPIS The dwarf nova type (SS CYG subclass) cataclysmic variable BV PUP appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 13.4340 <14.4 SRX APR 18.3833 13.6 SRX ---------------------------------------------------------------------------- 0804+28 YZ CANCRI The dwarf nova type (SU UMA subclass) cataclysmic variable YZ CNC is undergoing an outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 15.1444 15.0 HSG APR 18.3806 12.1 SRX APR 15.844 <13.6 MUY APR 18.847 12.2 MUY APR 16.853 <13.6 MUY APR 19.09 11.8 DGP APR 17.1896 12.3 BTH APR 19.1330 12.72 CCDV ZRE APR 17.858 12.6 MUY APR 20.1597 13.4 HSG APR 18.2139 11.8 AAP ---------------------------------------------------------------------------- 0814+73 Z CAMELOPARDALIS The dwarf nova type (Z CAM subclass prototype) cataclysmic variable Z CAM is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 16.860 13.2 MUY APR 19.09 12.5 DGP APR 17.2104 12.9 BTH APR 19.8400 12.2 SJZ APR 17.865 13.2 MUY APR 19.8417 12.1 CMG APR 18.8360 12.7 SJZ APR 19.8417 12.3 CMG APR 18.854 13.2 MUY APR 20.1458 11.7 HSG ---------------------------------------------------------------------------- 0855+18 SY CANCRI The dwarf nova type (Z CAM subclass) cataclysmic variable SY CNC is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 13.883 13.3 PYG APR 16.858 12.5 MUY APR 14.0826 13.1 MKJ APR 17.860 12.6 MUY APR 14.1438 13.2 HSG APR 18.3910 12.8 SRX APR 14.883 12.9 PYG APR 18.850 12.8 MUY APR 15.1451 13.2 HSG APR 19.09 12.7 DGP APR 15.8 12.7 GGX APR 20.1611 12.4 HSG APR 15.849 12.6 MUY ---------------------------------------------------------------------------- 0905+51 DI URSAE MAJORIS The dwarf nova type cataclysmic variable DI UMA appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 15.1938 <15.5 HSG APR 20.1521 14.9 HSG ---------------------------------------------------------------------------- 1140-03 TW VIRGINIS The dwarf nova type cataclysmic variable TW VIR is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 13.2590 15.0 COO APR 16.959 13.3 MUY APR 13.4563 14.8 SRX APR 17.885 13.4 MUY APR 14.1563 14.8 HSG APR 18.4083 13.0 SRX APR 15.1868 13.7 HSG APR 18.872 13.2 MUY APR 15.4167 13.0 SRX APR 19.09 12.8 DGP APR 15.867 13.5 MUY APR 20.1632 13.1 HSG ---------------------------------------------------------------------------- 1317-41 V803 CENTAURI The cataclysmic variable V803 CEN appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 13.778 14.1 MLF APR 17.778 13.7 PEX APR 13.803 14.1 PEX APR 17.803 13.8 MLF APR 16.788 13.4 PEX APR 18.4194 13.2 SRX ---------------------------------------------------------------------------- 1805-14 UZ SERPENTIS The dwarf nova type (possible Z CAM subclass) cataclysmic variable UZ SER may be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 12.6750 <13.6 SRX APR 18.5639 13.2 SRX ---------------------------------------------------------------------------- 1911-00 FO AQUILAE The dwarf nova type (SS CYG subclass) cataclysmic variable FO AQL is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 15.3650 15.62 CCDV ZRE APR 19.3680 13.36 CCDV ZRE APR 18.6396 13.4 SRX ---------------------------------------------------------------------------- 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 14.3000 14.7 CCDV ZRE APR 19.09 12.8 DGP APR 15.906 14.0 MUY APR 19.0917 12.7 CGF APR 16.888 <13.5 MUY APR 19.3060 12.7 CCDV ZRE ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: AAP - A. ABBOTT, CANADA MKJ - J. MCKENNA, USA BRJ - J. BORTLE, USA MLF - L. MONARD, SOUTH AFRICA BTH - T. BURROWS, USA MUY - E. MUYLLAERT, BELGIUM CGF - G. CHAPLE JR., USA PEX - A. PEARCE, AUSTRALIA CMG - G. COMELLO, NETHERLANDS PYG - G. POYNER, ENGLAND COO - L. COOK, USA SJZ - J. SPEIL, POLAND DGP - G. DYCK, USA SRX - R. STUBBINGS, AUSTRALIA GGX - G. GUZMAN, FRANCE ZRE - R. ZISSELL, USA HSG - G. HANSON II, 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! ____________________________________________________________________________