BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars Cataclysmic Variables Circular No.127 1997, January 27 Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM Internet: tvanmuns@innet.be TEL. 32-11-831504 CBA Belgium Web Page : http://www.astro.columbia.edu/~cba/be =================================================================== EG Cnc [UGWZ, 11.9v - 17:v] =========================== N.Makiguchi, Kanagawa, Japan, Gary Poyner, Birmingham, UK and Lasse Jensen, CBA Denmark report yet another rebrightening of EG Cnc. Their observations have been included in the photometric summary below. ------------------------------------------- DATE (UT) MAGN MS OBSERVER ------------------------------------------- 1996 12 06.760 12.9 mv Watanabe 1996 12 07.630 12.6 mv Watanabe 1996 12 21.722 13.1 mv Watanabe 1996 12 21.788 13.1 mv Watanabe 1997 01 07.024 15.7 mv Jensen 1997 01 09.142 16.26 CV Zissell 1997 01 09.193 <14.1 mv Hanson 1997 01 09.618 <15.2 mv Watanabe 1997 01 09.660 15.67 mv Koshiro 1997 01 10.068 13.17 CU Jensen 1997 01 10.181 13.8 mv Hanson 1997 01 10.212 13.7 mv Hanson 1997 01 10.260 13.8 mv Hanson 1997 01 10.292 13.5 mv Shaw 1997 01 10.492 13.8 mv Takahashi 1997 01 10.538 13.7 mv Takahashi 1997 01 10.615 13.6 mv Takahashi 1997 01 10.653 13.4 mv Itoh 1997 01 10.656 14.03 mv Koshiro 1997 01 10.748 13.7 mv Itoh 1997 01 10.760 13.96 CV Ouda 1997 01 10.84 14.7 mv Kinnunen 1997 01 10.842 13.8 mv Itoh 1997 01 11.1538 14.67 CV Zissell 1997 01 11.1632 14.0 mv Stewart 1997 01 11.251 14.4: mv Hanson 1997 01 11.298 14.7: mv Hanson 1997 01 11.581 14.6: mv Takahashi 1997 01 11.597 <14.0 mv Makiguchi 1997 01 11.610 <14.8 mv Itoh 1997 01 11.635 <14.2 mv Makiguchi 1997 01 11.694 15.29 CV Ouda 1997 01 11.946 <14.0 mv Jensen 1997 01 12.03 <14.9 mv Pietz 1997 01 12.210 <14.6 mv Hanson 1997 01 12.596 <14.2 mv Itoh 1997 01 12.659 16.27 CV Ouda 1997 01 13.678 16.21 CV Ouda 1997 01 13.917 <14.6 mv Poyner 1997 01 13.946 <13.9 mv Vanmunster 1997 01 13.98 <14.8 mv Pietz 1997 01 14.257 <14.6 mv Shaw 1997 01 14.8722 15.6 mv Jensen 1997 01 14.98 <15.0 mv Pietz 1997 01 14.990 <15.1 mv Poyner 1997 01 15.005 <15.5 mv Vanmunster 1997 01 15.453 <14.0 mv Takahashi 1997 01 15.729 16.23 CV Ouda 1997 01 15.898 <13.9 mv Vanmunster 1997 01 16.14 <13.7 mv Schmeer 1997 01 16.148 <15.2 mv Vanmunster 1997 01 16.284 16.23 CV Kemp 1997 01 16.559 15.33 CV Koshiro 1997 01 16.83 13.5 mv Pietz 1997 01 16.833 13.0: mv Schmeer 1997 01 16.936 13.6 CU Vanmunster 1997 01 16.96 13.5 mv Pietz 1997 01 17.135 13.3 mv Schmeer 1997 01 17.254 13.6 CU Vanmunster 1997 01 17.455 13.7 mv Takahashi 1997 01 17.497 13.6 mv Takahashi 1997 01 17.585 13.3 mv Itoh 1997 01 17.773 13.9 mv Watanabe 1997 01 17.8187 13.50 CU Jensen 1997 01 17.863 13.8 mv Itoh 1997 01 17.875 14.3 mv Poyner 1997 01 17.961 14.2 mv Poyner 1997 01 18.1277 14.27 CU Jensen 1997 01 18.508 <14.6 mv Hanson 1997 01 18.608 <14.0 mv Makiguchi 1997 01 19.474 <14.6 mv Hanson 1997 01 19.798 16.30 CV Ouda 1997 01 20.586 <13.7 mv Itoh 1997 01 20.669 16.18 CV Ouda 1997 01 20.88 <15.1 mv Kinnunen 1997 01 22.608 <13.5 mv Itoh 1997 01 22.665 <13.4 mv Watanabe 1997 01 24.7791 16.4 mv Jensen 1997 01 24.80 <14.1 mv Kinnunen 1997 01 25.568 <13.5 mv Itoh 1997 01 25.597 <14.0 mv Makiguchi 1997 01 25.7347 15.2 mv Jensen 1997 01 25.854 <14.1 mv Poyner 1997 01 26.2048 13.85 mv Jensen 1997 01 26.542 13.5 mv Makiguchi 1997 01 26.9583 13.7 mv Poyner EY Cyg [UGSS, 11.4v - 15.5v] ============================ Following the outburst notification in CVC 125, we herewith present a first photometric overview : ------------------------------------------- DATE (UT) MAGN MS OBSERVER ------------------------------------------- 1997 01 10.082 <14.5 mv Hanson 1997 01 11.298 14.7: mv Hanson 1997 01 11.71 12.8: mv Pietz 1997 01 11.72 12.8 mv Pietz 1997 01 11.73 12.8 mv Pietz 1997 01 11.75 12.8 mv Pietz 1997 01 11.965 13.1 mv Dyck 1997 01 12.097 12.7 mv Hanson 1997 01 12.104 12.7 mv Hanson 1997 01 12.118 12.7 mv Hanson 1997 01 12.46 12.0 mv Dyck 1997 01 12.715 12.5: mv Schmeer 1997 01 12.731 12.4 mv Schmeer 1997 01 13.71 12.1 mv Pietz 1997 01 13.740 12.0 mv Poyner 1997 01 13.751 12.1 mv Broens 1997 01 14.67 12.1 mv Kinnunen 1997 01 14.7020 11.88 CU Jensen 1997 01 14.71 11.5 mv Pietz 1997 01 14.754 11.7 mv Poyner 1997 01 15.71 11.5 mv Pietz 1997 01 15.778 12.0 mv Broens 1997 01 16.67 12.0 mv Kinnunen 1997 01 16.72 11.5 mv Pietz 1997 01 17.757 12.1 mv Poyner 1997 01 18.546 12.1 mv Hanson 1997 01 19.093 12.3: mv Hanson 1997 01 20.65 12.1 mv Kinnunen 1997 01 24.081 <12.2 mv Hanson 1997 01 24.68 12.8 mv Kinnunen 1997 01 25.749 12.8 mv Poyner 1997 01 25.079 <12.5 mv Hanson V701 Tau [UGSU, 15.0p - <21p] ============================= The V701 Tau outburst, announced in CVC 124, is a superoutburst, according to time-series CCD photometry observations at Ouda Station, Japan and CBA Belgium Observatory. D. Nogami, Ouda Observatory, Japan reports : "Our 3hr CCD photometry on 1997 January 12 at Ouda Station revealed fully developed super- humps with an amplitude of about 0.2 mag in V701 Tau, proving the current outburst to be a superoutburst next to the one observed in 1995 December/1996 January (see, T. Kato, vsnet-alert 303). This suggests that the recurrence time of the superoutburst (supercycle) in V701 Tau is about 370 days (or 1/N)." Independent CCD photometry at CBA Belgium on January 11/12 and January 12/13 confirms these findings. The short duration of the observing sessions, combined with poor atmospheric conditions, prevented the deduction of a secure superhump period. ------------------------------------------- DATE (UT) MAGN MS OBSERVER ------------------------------------------- 1997 01 03.044 <14.7 mv Poyner 1997 01 11.941 15.7 CU Vanmunster 1997 01 12.0282 15.6 CU Vanmunster 1997 01 12.505 15.35 CV Ouda 1997 01 12.782 15.7 CU Vanmunster 1997 01 12.847 15.7 CU Vanmunster 1997 01 13.461 15.46 CV Ouda 1997 01 13.770 15.9 CU Vanmunster 1997 01 13.861 14.9 mv Poyner 1997 01 13.965 15.8 CU Vanmunster 1997 01 14.7444 15.32 CU Jensen 1997 01 14.951 15.3 mv Poyner 1997 01 15.469 15.53 CV Ouda 1997 01 25.817 <15.3 mv Poyner BZ UMa [UGSU:, 10.5v - 17.8v] ============================= Unfiltered time-series CCD photometry at the CBA Belgium Observatory (using a 25-cm f/6.3 telescope and ST-7 CCD) on January 09/10 and January 11/12 did not reveal any superhumps. We therefore must conclude that the present outburst has again been a normal one. The variable has now returned to minimum light. ------------------------------------------- DATE (UT) MAGN MS OBSERVER ------------------------------------------- 1997 01 09.194 14.4: mv Hanson 1997 01 09.196 14.3: mv Hanson 1997 01 09.202 14.2 mv Hanson 1997 01 09.206 14.1 mv Hanson 1997 01 09.211 14.0 mv Hanson 1997 01 09.214 14.0 mv Hanson 1997 01 09.217 13.9 mv Hanson 1997 01 09.221 13.8 mv Hanson 1997 01 09.224 13.7 mv Hanson 1997 01 09.229 13.6 mv Hanson 1997 01 09.232 13.5 mv Hanson 1997 01 09.235 13.4 mv Hanson 1997 01 09.241 13.3 mv Hanson 1997 01 09.244 13.2 mv Hanson 1997 01 09.247 13.2 mv Hanson 1997 01 09.250 13.1 mv Hanson 1997 01 09.253 13.1 mv Hanson 1997 01 09.256 13.0 mv Hanson 1997 01 09.262 12.9 mv Hanson 1997 01 09.266 12.9 mv Hanson 1997 01 09.272 12.9 mv Hanson 1997 01 09.277 12.8 mv Hanson 1997 01 09.531 11.7 mv Hanson 1997 01 09.560 11.6 mv Hanson 1997 01 09.749 11.49 CU Jensen 1997 01 09.791 11.9 CU Vanmunster 1997 01 09.820 11.9 CU Vanmunster 1997 01 09.945 11.5 mv Jensen 1997 01 10.083 11.4 mv Hanson 1997 01 10.174 11.5 mv Hanson 1997 01 10.210 11.9 mv Hanson 1997 01 10.262 11.7 mv Hanson 1997 01 10.724 12.59 mv Koshiro 1997 01 10.7861 12.23 CU Jensen 1997 01 10.825 12.5 mv Itoh 1997 01 10.843 12.62 CV Ouda 1997 01 10.83 12.3 mv Kinnunen 1997 01 11.1646 13.0 mv Scovil 1997 01 11.1819 12.3 mv Stewart 1997 01 11.1854 12.6 mv Bortle 1997 01 11.246 12.7 mv Hanson 1997 01 11.283 12.9 mv Hanson 1997 01 11.631 12.5 mv Makiguchi 1997 01 11.765 13.9 CU Vanmunster 1997 01 11.81 13.9 mv Pietz 1997 01 11.812 13.7 mv Jensen 1997 01 11.85 14.0 mv Pietz 1997 01 11.88 13.8 mv Pietz 1997 01 11.93 13.9 mv Pietz 1997 01 11.934 14.2 CU Vanmunster 1997 01 11.97 14.0 mv Pietz 1997 01 11.984 14.2 mv Vanmunster 1997 01 12.00 14.3 mv Pietz 1997 01 12.109 13.8 mv Hanson 1997 01 12.817 15.07 CV Ouda 1997 01 13.0465 15.5 mv Bortle 1997 01 13.809 15.66 CV Ouda 1997 01 13.846 <13.7 mv Vanmunster 1997 01 13.868 <15.4 mv Poyner 1997 01 14.7354 15.75 CU Jensen 1997 01 14.960 <15.4 mv Poyner 1997 01 15.821 15.89 CV Ouda 1997 01 15.834 <14.5 mv Broens 1997 01 16.147 <13.7 mv Vanmunster 1997 01 17.904 <13.7 mv Poyner Tonny Vanmunster