BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars Cataclysmic Variables Circular No.98 1996, July 07 Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM Internet: tvanmuns@innet.be TEL. 32-11-831504 -------------------------------------------------------------- The CATACLYSMIC VARIABLES Home Page: http://www.cv.psi.edu =================================================================== DM Lyr [UG, 13.6p - 18p] ======================== We have been informed by Gary Poyner, Birmingham, UK about his visual detection of an outburst of DM Lyrae. CCD confirmation has been obtained from Tonny Vanmunster, CBA Belgium. Reported observations : 1996 Jul 05.977 UT, [14.8 (G. Poyner, 0.40-m refl.); Jul 07.043 UT, 14.5 (Poyner); Jul 07.056 UT, 15.0 (T. Vanmunster, 0.25-m SCT, unfilt. ST-7 CCD); Jul 07.061 UT, 14.4 (Poyner); Jul 07.082 UT, 14.3 (Poyner); DM Lyr was last seen in outburst on 1995, Nov. 20 by J. Pietz, Germany, who reported it at mag. 14.2 [CVC 72]. It reached mag 13.9 approx. 5 days later and remained visible for 8 days [CVC 74]. SX LMi [UGSU, 13 - 17.4V] ========================= The table below lists follow-up observations for the SX LMi outburst, reported in CVC 97. Given the limited number of observations, it's difficult to judge if this was a superoutburst or normal outburst. ----------------------------------------------------------------------- DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE ----------------------------------------------------------------------- 1996 06 03.938 13.2 mv GSC Vanmunster, T. CVC97 1996 06 03.940 13.1 CU GSC Vanmunster, T. VVS 1996 06 04.937 13.2 mv TA Worraker, B. priv(WOR) 1996 06 04.940 13.0 mv TA Poyner, G. priv(POY) 1996 06 05.224 13.1 mv Burrows, T. AAVSO 1996 06 06.073 13.3 mv Stewart AAVSO 1996 06 06.100 13.8 mv Scovil, C. AAVSO 1996 06 06.167 14.0 mv York, D. AAVSO 1996 06 06.221 13.5 mv Burrows, T. AAVSO 1996 06 06.924 13.7 mv GSC Vanmunster, T. VVS 1996 06 06.938 13.6: mv TA Poyner, G. VSNET 1996 06 07.936 13.4 mv GSC Vanmunster, T. VVS 1996 06 08.945 [14.4 mv TA Poyner, G. VSNET V1316 Cyg [UGSU:, 14.5p - <17.5p] ================================= This intriguing object has been included in the observing programme of both visual and CCD observers. It has received some good monitoring already, but deserves further coverage until it disappears in evening twilight. In a recent VSNET message, T. Kato, Kyoto University, Japan, notes : "I have checked the discovery paper of V1316 Cyg and found the position exactly corresponds to the object we are observing (the object marked in Downes & Shara 1993 and Bruch et al. 1987, A&AS 70,481). Bruch and Schimpke 1992 (A&AS 93, 419) further provides spectroscopic confirmation, showing a typical dwarf nova spectrum in outburst." The photometric summary, started in CVC 96, can be completed with the following observations : ----------------------------------------------------------------------- DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE ----------------------------------------------------------------------- 1996 05 25.995 [14.8 mv Kat Poyner, G. 1996 06 01.150 [13.8 CU Ouimet, P. 1996 06 04.980 14.2 CU Kat Vanmunster, T. 1996 06 06.005 14.44 CU Jensen, L. 1996 06 07.072 14.4 CU Kat Vanmunster, T. 1996 06 08.068 14.5 CU Kat Vanmunster, T. 1996 06 09.005 14.6 mv Kat Poyner, G. 1996 06 13.005 14.6 mv Kat Poyner, G. 1996 06 13.908 14.4 CU Kat Vanmunster, T. 1996 06 14.009 14.6 mv Kat Poyner, G. 1996 06 15.010 14.7 mv Kat Poyner, G. 1996 06 15.132 [13.8 CU Ouimet, P. 1996 06 16.013 14.7 mv Kat Poyner, G. 1996 06 18.013 14.7 mv Kat Poyner, G. 1996 06 22.990 [14.8 mv Kat Poyner, G. 1996 06 24.992 [14.8 mv Kat Poyner, G. 1996 07 01.989 [14.5 mv Kat Poyner, G. 1996 07 02.002 14.5 CU Kat Jensen, L. 1996 07 02.962 14.3 CU Kat Vanmunster, T. 1996 07 02.965 14.2 CU Kat Jensen, L. 1996 07 03.997 14.6 mv Kat Poyner, G. 1996 07 05.999 14.6 mv Kat Poyner, G. Var21 CrB [UG, 14.5 - <17.5p] ============================= This recently discovered dwarf nova [IBVS 4343] by S.V. Antipin has been detected in outburst by M. Iida, VSOLJ, Japan on a CCD image, obtained on June 26.539 UT. No additional positive observations have been received and coverage in general was rather poor. This new variable definitely should get more attention during a next outburst. Available observations : 1996 Jun 22.503 UT, [17.2 (M. Iida, 0.20-m SCT, unfilt. ST-6 CCD); Jun 24.955 UT, [15.0 (G. Poyner, 0.40-m refl.); Jun 25.988 UT, [15.0 (G. Poyner, 0.40-m refl.); Jun 26.539 UT, 15.4 (M. Iida); Jun 26.541 UT, 15.4 (M. Iida); Jun 26.544 UT, 15.5 (M. Iida); Jul 02.006 UT, [15.7 (L. Jensen, 0.25-m SCT, unfilt. ST-6 CCD); Jul 02.915 UT, [15.5 (T. Vanmunster, 0.25-m SCT, unfilt. ST-7); Jul 02.951 UT, [17.2 (L. Jensen); NSV 786 [UG?, 12p - 14p] ======================== NSV 786 has been added to the CVAP in October 1995 [CVC 63], as a possible UG-type cataclysmic variable with a magnitude range between mag 12p and 14p. Ron Downes, STSCI, Maryland, USA communicates following information on NSV 786 : "I did get the (original) Bamberg reference, which had no chart. However, the reference equated NSV 786 with BD+78 79, which is a 9.3 star. The range quoted in the paper is 12 max, with an amplitude of 2m, so if the BD star is really the object, then the BD observation is in outburst, and the range is 10-12, not 12-14 (contrary to the NSV catalog). I have my doubts about the reality of this object, but if you can monitor it for a couple months and see no variations, that could confirm the non-reality of the CV classification." IP Peg [UG, 12.0B - 16.6B] ========================== According to AAVSO News Flash No. 32, the recent IP Peg outburst, detected by Gary Poyner on June 16.059 UT (at mag. 12.6) was a superoutburst. We refer to the News Flash for follow-up observations. Tonny Vanmunster