BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars Cataclysmic Variables Circular No.99 1996, July 11 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 =================================================================== V630 Cyg [UGSU:, 13.4p - 17.2p] =============================== Eric Broens (observing from the South of France) reports an outburst of the CVAP object V630 Cyg. Gary Poyner, Birmingham, UK also observed the outburst. Available observations : 1996 Jul. 10.085 UT, 14.2 (E. Broens, 0.35-m refl., seq: AAVSO); Jul. 11.039 UT, 14.4 (G. Poyner, 0.40-m refl.); Remark that the classification of V630 Cyg as a SU UMa-type dwarf nova is still unsure. Therefore follow-up observations (in particular high-speed CCD photometry in search of superhumps), are highly encouraged. V630 Cyg underwent a remarkable outburst in October 1995, when it was visible at mag 14.2 for one night, then disappeared (<14.9) and again was in outburst 4 nights later (see CVC 66). This was very likely a precursor type of short outburst followed by a superoutburst, hence establishing the SU UMa-type nature of this object. V630 Cyg was last reported in outburst on May 23, 1996 (Lasse Jensen, CBA Denmark) [CVC 96]. DM Lyr [UG, 13.6p - 18p] ======================== The DM Lyr outburst, announced in our previous circular, receives good coverage, as indicated by the photometric summary below. ----------------------------------------------------------------------- DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE ----------------------------------------------------------------------- 1996 07 05.977 [14.8 mv Poyner, G. CVC 98 1996 07 07.043 14.5 mv Poyner, G. CVC 98 1996 07 07.056 15.0 CU AA Vanmunster, T. CVC 98 1996 07 07.061 14.4 mv Poyner, G. CVC 98 1996 07 07.082 14.3 mv Poyner, G. CVC 98 1996 07 07.956 14.3 mv Poyner, G. priv(POY) 1996 07 07.975 14.0: mv Biesmans, M. VSNET 1996 07 07.977 14.4: mv Day, J. priv(POY) 1996 07 08.019 14.7 CU Jensen, L. VSNET 1996 07 08.021 14.4 mv Day, J. priv(POY) 1996 07 08.047 14.3 mv Poyner, G. priv(POY) 1996 07 09.951 14.3 mv TA Worraker, B. priv(WOR) 1996 07 09.955 14.2 mv Day, J. priv(POY) 1996 07 10.020 14.3 mv AA Broens, E. Indep. Det. priv(BRO) 1996 07 10.958 14.5 mv TA Worraker, B. priv(WOR) 1996 07 10.979 13.7 mv Poyner, G. VSNET 1996 07 11.083 13.8 mv Poyner, G. VSNET Tonny Vanmunster