BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars Cataclysmic Variables Circular No.40 1995, June 07 Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM Internet: tvanmuns@innet.be TEL. 32-11-831504 P. Van Cauteren, de Borrekenslaan 54, 2630 Aartselaar, BELGIUM Internet: pvancaut@innet.be TEL. 32-3-8774098 =================================================================== KM Lac [UGSS, 14.8p - <17.4p] ============================= This variable, which recently was added to the CVAP (CVC 39), is reported in outburst by Tonny Vanmunster, Landen, Belgium. Based on a private communication from R.A. Downes (STSCI), the object is NOT confirmed as a CV, contrary to what might be derived from the classification in Downes & Shara (1993). KM Lac is included in the list of suspected TOADs - Tremendous Outburst Amplitude Dwarf novae - (Howell 1995), and is located at : R.A. = 22h13m49.92s Decl.= +55g28'23.5" (2000.0) We could trace only one reference on KM Lac in the Simbad data- base, operated by CDS Strassbourg, and we could NOT identify any past observations of this interesting object. We strongly encou- rage observers world-wide to monitor KM Lac during its present outburst, both photometrically and spectroscopically. 1995 06 07.987 UT, 14.3 (T. Vanmunster, 0.35-m refl., seq: GSC); References : ------------ Downes, R.A., Shara, M.M., 1993, PASP, 105, 127-245 Howell, S., 1995, AJ, 439, 337-345 T Leo [UGSU, 10B - 15.7B] ========================= The outburst of T Leo, announced in CVC 38, apparently was a normal one. 4 days after the outburst detection, T Leo already had faded by more than 4 magnitudes. No secondary maximum was reported, as one can deduce from the photometric summary below. ----------------------------------------------------------------------- DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE ------------------------------------------------------------------------ 1995 05 20.875 [13.6 mv TA Schmeer, P. 20-cm SCT priv(SCH) 1995 05 20.958 [13.6 mv TA Vanmunster, T. 35-cm refl. VVS 1995 05 21.869 10.4 mv TA Schmeer, P. 20-cm SCT priv(SCH) 1995 05 21.891 10.4 mv TA Pietz, J. 20-cm SCT VSNET 1995 05 21.910 10.2 mv TA Vanmunster, T. 35-cm refl. VVS 1995 05 21.924 10.4 mv TA Schmeer, P. 20-cm SCT priv(SCH) 1995 05 21.932 10.0 mv AA Jensen, L. 33-cm refl. priv(JEN) 1995 05 21.933 10.4 mv TA Broens, E. 35-cm refl. VVS 1995 05 21.940 10.4 mv TA Broens, E. 35-cm refl. VVS 1995 05 22.531 11.0 CV Kiyota, S. 25-cm+CCD+V VSNET 1995 05 22.578 11.2 CU Iida, M. 16-cm+ST-6 VSNET 1995 05 22.878 11.0 mv TA Diepvens, A. 16-cm refl. VVS 1995 05 22.879 11.3 mv TA Schmeer, P. 20-cm SCT priv(SCH) 1995 05 22.922 10.0 mv AA Jensen, L. 33-cm refl. priv(JEN) 1995 05 22.929 11.3 mv TA Schmeer, P. 20-cm SCT priv(SCH) 1995 05 22.940 11.6 mv TA Vanmunster, T. 35-cm refl. VVS 1995 05 23.576 12.3 mv Makiguchi, N. 25-cm refl. VSNET 1995 05 23.865 12.6 mv Szentasko, L. 33-cm refl. VSNET 1995 05 23.914 13.8 mv TA Vanmunster, T. 35-cm refl. VVS 1995 05 23.917 13.6 mv TA Schmeer, P. 20-cm SCT priv(SCH) 1995 05 23.934 [11.3 mv AA Jensen, L. 33-cm refl. priv(JEN) 1995 05 25.837 14.8 mv Szentasko, L. 33-cm refl. VSNET 1995 05 27.479 [13.5 mv Takenaka, Y. 20-cm SCT VSNET 1995 05 27.521 [13.8 mv Makiguchi, M. 25-cm refl. VSNET 1995 05 27.900 [14.2 mv TA Vanmunster, T. 35-cm refl. VVS 1995 05 27.920 [13.6 mv TA Broens, E. 35-cm refl. VVS CY UMa [UGSU, 11.9v - 17.0v] ============================ This was another normal (faint) outburst. CY UMa never got brighter than mag. 13 or so and already became invisible after a few days. ----------------------------------------------------------------------- DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE ------------------------------------------------------------------------ 1995 05 19.868 [13.5 mv FU Schmeer, P. 20-cm SCT priv(SCH) 1995 05 19.931 [14.7 mv AA Vanmunster, T. 35-cm refl. VVS 1995 05 20.86 [13.4 mv FU Schmeer, P. 20-cm SCT priv(SCH) 1995 05 20.950 13.6 mv FU Schmeer, P. 20-cm SCT priv(SCH) 1995 05 20.951 14.1 mv AA Vanmunster, T. 35-cm refl. VVS 1995 05 20.974 13.8 mv AA Broens, E. 35-cm refl. VVS 1995 05 21.899 13.5 mv AA Jensen, L. 33-cm refl. priv(JEN) 1995 05 21.902 13.8 mv AA Vanmunster, T. 35-cm refl. VVS 1995 05 21.914 12.8 mv TA Diepvens, A. 16-cm refr. VVS 1995 05 21.946 13.9 mv AA Broens, E. 35-cm refl. VVS 1995 05 21.953 13.5 mv FU Schmeer, P. 20-cm SCT priv(SCH) 1995 05 22.915 [14.4 mv AA Jensen, L. 33-cm refl. priv(JEN) 1995 05 22.962 [13.7 mv FU Schmeer, P. 20-cm SCT priv(SCH) 1995 05 22.945 [14.0 mv AA Vanmunster, T. 35-cm refl. VVS 1995 05 23.580 [13.8 mv Makiguchi, N. 25-cm refl. VSNET 1995 05 23.921 14.7 mv AA Vanmunster, T. 35-cm refl. VVS 1995 05 23.940 [14.0 mv TA Poyner, G. 40-cm refl. VSNET 1995 05 23.95 [13.9 mv FU Schmeer, P. 20-cm SCT priv(SCH) 1995 05 27.902 [14.7 mv AA Vanmunster, T. 35-cm refl. VSNET 1995 05 27.953 [14.8 mv AA Broens, E. 35-cm refl. VVS FU = Sequence by Fujino AL Com [UGWZ, 12.8v - 22v] ========================== The photometric summary below concludes our reporting on AL Com. This must have been one of the best covered outbursts of dwarf novae ever, looking at the density of the resulting light curve ! ----------------------------------------------------------------------- DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE ------------------------------------------------------------------------ 1995 05 02.869 [14.8 mv BS * Vanmunster, T. 35-cm refl. VVS 1995 05 02.883 [14.8 mv BS * Vanmunster, T. 35-cm refl. VVS 1995 05 03.035 [15.4 mv BS * Szentasko, L. 33-cm refl. VSNET 1995 05 03.207 16.0 CU * Royer, R. AAVSO 1995 05 03.546 17.0 CV BS * Nogami, D. 60-cm+CCD+V VSNET 1995 05 03.864 [14.8 mv BS * Vanmunster, T. 35-cm refl. VVS 1995 05 03.830 16.1: mv BS * Szentasko, L. 33-cm refl. VSNET 1995 05 03.91 16.5: CV BS * Pietz, J. VSNET 1995 05 03.965 [13.9 mv BS * Poyner, G. 40-cm refl. VSNET 1995 05 04.120 15.2 mv BS * Bortle, J. VSNET 1995 05 04.159 15.2 mv BS * York, D. AAVSO 1995 05 04.173 15.3 mv BS * Bortle, J. VSNET 1995 05 04.176 15.2 mv BS * York, D. AAVSO 1995 05 04.200 15.2 mv BS * York, D. AAVSO 1995 05 04.299 15.6 CU BS * Royer, R. AAVSO 1995 05 04.307 15.6 CU BS * Royer, R. AAVSO 1995 05 04.315 15.6 CU BS * Royer, R. AAVSO 1995 05 04.86 16.0: CV BS * Pietz, J. VSNET 1995 05 04.875 [14.8 mv BS * Vanmunster, T. 35-cm refl. VVS 1995 05 04.891 [13.9 mv BS * Diepvens, A. 16-cm refr. VVS 1995 05 04.986 [14.7 mv BS * Poyner, G. 40-cm refl. VSNET 1995 05 05.584 15.8 CV BS * Nogami, D. 60-cm+CCD+V VSNET 1995 05 05.824 15.7 mv BS * Szentasko, L. 33-cm refl. VSNET 1995 05 05.878 [14.8 mv BS * Vanmunster, T. 35-cm refl. VVS 1995 05 06.492 15.4 CU BS * Iida, M. 16-cm+ST6 VSNET 1995 05 06.600 15.2 CV BS * Nogami, D. 60-cm+CCD+V VSNET 1995 05 07.950 15.1 mv BS * Poyner, G. 40-cm refl. VSNET 1995 05 07.995 15.1 mv BS * Poyner, G. 40-cm refl. VSNET 1995 05 08.519 15.3 CU BS * Iida, M. 16-cm+ST-6 VSNET 1995 05 08.916 [14.7 mv BS * Poyner, G. 40-cm refl. VSNET 1995 05 09.539 16.0: CU BS * Iida, M. 16-cm+ST-6 VSNET 1995 05 10.049 [13.9 mv BS * Vanmunster, T. 35-cm refl. VVS 1995 05 17.469 15.8 CU BS * Iida, M. 16-cm+ST-6 VSNET 1995 05 17.641 15.5 CV BS * Kato, T. 60-cm+CCD+V VSNET 1995 05 18.517 16.8 CU BS * Iida, M. 16-cm+ST-6 VSNET 1995 05 18.540 [14.9 mv BS * Takahashi, S. 60-cm refl. VSNET 1995 05 18.563 16.4 CV BS * Kato, T. 60-cm+CCD+V VSNET 1995 05 18.896 [14.8 mv BS * Vanmunster, T. 35-cm refl. VVS 1995 05 19.526 [14.9 CU BS * Iida, M. 16-cm+ST-6 VSNET 1995 05 19.561 17.5 CV BS * Kato, T. 60-cm+CCD+V VSNET 1995 05 19.942 [14.8 mv BS * Vanmunster, T. 35-cm refl. VVS 1995 05 20.961 [14.8 mv BS * Vanmunster, T. 35-cm refl. VVS 1995 05 22.538 [17.6 CU BS * Iida, M. 16-cm+ST-6 VSNET 1995 05 22.568 18.7 CV BS * Nogami, D. 60-cm+CCD+V VSNET 1995 05 23.502 [17.6 CU BS * Iida, M. 16-cm+ST-6 VSNET 1995 05 23.872 15.8 mv BS * Szentasko, L. 33-cm refl. VSNET 1995 05 25.84 [16.5 mv BS * Szentasko, L. 33-cm refl. VSNET 1995 05 27.544 18.0: CU BS * Iida, M. 16-cm+ST-6 VSNET BS = Sequence by Stanton and Bertola (in use by AAVSO & The Astronomer) Tonny Vanmunster