BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars Cataclysmic Variables Circular No.117 1996, December 16 Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM Internet: tvanmuns@innet.be TEL. 32-11-831504 =================================================================== V493 Lyr [UG, 13.2 - 18.0p] =========================== Jochen Pietz, Germany and Lasse Jensen, Denmark independently report their visual detection of an outburst of V493 Lyr. This quite remarkable object (see below) is included in the TA/BAAVSS Recurrent Objects Programme. Available observations at present : 1996 Dec 13.069 UT, [14.1 (G. Hanson); Dec 14.71 UT, 14.7 (J. Pietz); Dec 14.76 UT, 14.7 (J. Pietz); The previous outburst of V493 Lyr was observed by J. Pietz on November 20, 1995 [CVC 72], when the object reached mag. 13.5 [CVC 72]. As noted by Tonny Vanmunster, Belgium in a VSNET message on November 27, 1995, this variable showed brightness variations of nearly 0.5 magnitudes in narrow time intervals, during that outburst. Experienced visual observers recorded this event several times. It would of course be extremely interesting to closely monitor the present outburst of V493 Lyr (preferably by CCD), in order to determine if this behaviour is re-occuring. DX And [UG, 10.9p - 16.4p] ========================== The ongoing DX And outburst, first announced in CVC 116, seems to be a quite unusual one, due to its faintness. The variable did not yet become brighter than mag. 12.7 during the present outburst, which is the faintest recorded maximum magnitude of DX And in the Outburst Activity Database on Selected Cataclysmic Variables, except for an outburst in January 1981 (when a maximum magnitude of 12.9 was reported). Since the outburst isn't over yet, we strongly advise to keep on monitoring this object. ------------------------------------------- DATE (UT) MAGN MS OBSERVER ------------------------------------------- 1996 11 08.223 14.9 mv Modic 1996 12 09.042 13.8 mv Griese 1996 12 09.157 13.8 mv Griese 1996 12 10.101 13.9 mv Modic 1996 12 11.388 13.40 CV Ouda 1996 12 12.209 13.5 mv Hanson 1996 12 12.260 13.5 mv Hanson 1996 12 12.70 13.4 mv Pietz 1996 12 13.230 13.6 mv Hanson 1996 12 13.685 13.0 CU Jensen 1996 12 13.922 13.2 mv Broens 1996 12 13.979 12.9 mv Vanmunster 1996 12 14.283 13.7 mv Hanson 1996 12 14.544 13.4 mv Makiguchi 1996 12 14.70 13.4 mv Pietz 1996 12 14.950 13.4 mv Vanmunster 1996 12 15.81 12.7 mv Verdenet EG Cnc [UGSU, 11.9v - 17:v] =========================== EG Cnc definitely is fading, as indicated by the observations in the photometric summary below, which is a continuation of the table presented in CVC 116. A rebrightening of EG Cnc in the coming week or two is not unlikely at all, and has been observed in other variables with long recurrence times. Despite the unfavourable conditions in the next two weeks (full moon), we encourage visual and CCD observers to give EG Cnc top priority and to immediately report a possible brightening. ------------------------------------------- DATE (UT) MAGN MS OBSERVER ------------------------------------------- 1996 12 09.680 12.60 CV Ouda 1996 12 11.757 12.82 CV Ouda 1996 12 11.820 12.8 mv Itoh 1996 12 12.250 12.7 mv Hanson 1996 12 12.616 12.7 mv Moriyama 1996 12 12.910 12.6 mv Schmeer 1996 12 13.267 13.0 mv Hanson 1996 12 13.812 13.23 CV Ouda 1996 12 13.933 13.06 CU Jensen 1996 12 13.972 13.4 mv Broens 1996 12 14.00 13.4 mv Pietz 1996 12 14.058 13.2 mv Vanmunster 1996 12 14.10 13.3 mv Pietz 1996 12 14.303 13.8 mv Hanson 1996 12 14.783 14.34 CV Ouda 1996 12 14.840 13.9 mv Itoh 1996 12 14.92 14.6 mv Pietz 1996 12 14.93 14.5 mv Kinnunen 1996 12 15.099 13.7 mv Schmeer 1996 12 15.210 13.8 mv Schmeer 1996 12 15.23 14.96 CV Kemp (CBA) 1996 12 15.627 [14.7 mv Takahasho 1996 12 16.06 15.3 mv Kinnunen QY Per [UG, 14.2p - <20p] ========================= The outburst observation of QY Per on Dec 07.88 UT by J. Pietz, Germany, reported in our previous CVC, has not been confirmed. Approximately 3 nights later, on Dec 11.401 UT, the variable was fainter than mag V=16.63, following a CCD image at Ouda Observatory, Kyoto University, Japan. Several negative visual observations were reported in the nights following December 11 too. Tonny Vanmunster