BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars Cataclysmic Variables Circular No.45 1995, July 10 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 =================================================================== BC UMa [UGSU, 10.9B - 18.3B] ============================ We have been informed by J. Mattei, AAVSO that D. York, Abiquiu, NM has discovered a rare outburst of the UGSU-type dwarf nova BC UMa. Available observations, taken from AAVSO Alert Notice 210, are : 1995 Jul 06.158 UT, 14.0 (D. York, 0.45-m refl., seq: AAVSO); Jul 07.235 UT, 13.0 (D. York); Taichi Kato, Kyoto University, Japan communicates : "BC UMa was first identified as a definite SU UMa-type dwarf nova by M. Iida on 1994, April 28, when he discovered superhumps with a period of 0.0619 day. Subsequent confirmation was made by C. Kunjaya on 1994, May 2, when the superhump period was determined as 0.0629 day." Steve Howell, Planetary Science Institute, Astrophysics Group, AZ further adds : "The orbital period of BC UMa was first determined in PASP, 1990, 102, 758. That period was 91.2 +/- 2 min. It will be interesting to see if a superhump period agrees with this period. BC UMa is a TOAD (Howell et al, 1995, ApJ, 439, 337) with an outburst amplitude of >7 mags, reaching maximum near 10.9 in V." According to our records in the Outburst Activity Database, BC UMa was last discovered in outburst on 1994, April 28, by M. Iida. During that superoutburst, it reached mag. 12.4 and remained brighter than V=15 for 9 days. Observers are strongly encouraged to report the used sequences and comparison stars when submitting observations of BC UMa. V1113 Cyg [UGSU, 14p - <17p] ============================ The outburst of V1113 Cyg, announced in CVC 44, clearly was a normal outburst, given its short duration. The photometric summary below contains all observations that we received. It's interesting to compare this summary with the one presented in CVC 36, which contains details of a superoutburst that lasted for more than 10 days. ----------------------------------------------------------------------- DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE ------------------------------------------------------------------------ 1995 06 21.913 [14.2 mv VS Vanmunster, T. 35-cm refl. CVC 44 1995 06 21.982 [14.3 mv VS Poyner, G. 40-cm refl. VSNET 1995 06 23.947 [13.6 mv Jensen, L. 33-cm refl. priv(JEN) 1995 06 24.938 [13.6 mv Jensen, L. 33-cm refl. priv(JEN) 1995 06 24.965 13.9 mv VS Vanmunster, T. 35-cm refl. CVC 44 1995 06 24.972 13.9 mv VS Broens, E. 35-cm refl. CVC 44 1995 06 25.932 14.8 mv VS Vanmunster, T. 35-cm refl. VVS 1995 06 25.938 14.7 mv Pietz, J. 40-cm refl. VSNET 1995 06 25.942 [13.6 mv Jensen, L. priv(JEN) 1995 06 25.951 14.2 mv VS Poyner, G. 40-cm refl. VSNET 1995 06 26.985 [14.6 mv VS Vanmunster, T. 35-cm refl. VVS 1995 06 27.006 [15.5 mv Pietz, J. 40-cm refl. VSNET 1995 06 27.062 [14.0 mv Schmeer, P. 20-cm SCT priv(SCH) 1995 06 27.942 [14.6 mv VS Vanmunster, T. 35-cm refl. VVS DX And [UG, 10.9p - 16.4p] ========================== Following the outburst announcement of DX And in CVC 42, we have been informed by the AAVSO (AAVSO Alert Notice 209) of an independent detection by their member Jack Nordby, Moorhead, MN. Since an outburst of DX And generally lasts two to three weeks, it may be that the start of the present outburst has been missed. Available observations are listed in the table below. ----------------------------------------------------------------------- DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE ------------------------------------------------------------------------ 1995 06 08.990 [13.8 mv AA Vanmunster, T. 35-cm refl. CVC 42 1995 06 10.010 [13.4 mv AA Schmeer, P. 20-cm SCT. CVC 42 1995 06 18.351 12.1 mv AA Nordby, J. AN 209 1995 06 18.993 12.2 mv AA Vanmunster, T. 35-cm refl. CVC 42 1995 06 19.001 12.3 mv TA Poyner, G. 22-cm refl. CVC 42 1995 06 19.009 12.3 mv AA Broens, E. 35-cm refl. CVC 42 1995 06 19.939 12.6 mv AA Vanmunster, T. 35-cm refl. VVS 1995 06 19.974 13.2 mv AA Diepvens, A. 15-cm refr. VVS 1995 06 19.996 12.3 mv AA Schmeer, P. 20-cm SCT priv(SCH) 1995 06 20.007 12.3 mv Pietz, J. 20-cm SCT priv(PIE) 1995 06 20.284 12.3 mv AA Nordby, J. AN 209 1995 06 20.461 12.5 mv AA Royer, R. AN 209 1995 06 21.26 12.9 mv AA Dyck, G. AN 209 1995 06 21.949 12.7 mv AA Vanmunster, T. 35-cm refl. VVS 1995 06 21.972 12.8 mv AA Jensen, L. 33-cm refl. priv(JEN) 1995 06 21.978 12.9 mv TA Poyner, G. 40-cm refl. VSNET 1995 06 22.003 13.1 mv Pietz, J. 20-cm SCT priv(PIE) 1995 06 22.019 12.9 mv AA Diepvens, A. 15-cm refr. VVS 1995 06 22.967 13.6 mv AA Schmeer, P. 20-cm SCT priv(SCH) 1995 06 23.958 [13.0 mv AA Jensen, L. 33-cm refl. priv(JEN) 1995 06 23.993 [13.8 mv AA Diepvens, A. 15-cm refr. VVS 1995 06 24.970 [13.0 mv AA Jensen, L. 33-cm refl. priv(JEN) 1995 06 24.987 13.7 mv AA Vanmunster, T. 35-cm refl. VVS 1995 06 25.951 14.1 mv AA Vanmunster, T. 35-cm refl. VVS 1995 06 25.974 [13.0 mv AA Jensen, L. 33-cm refl. priv(JEN) 1995 06 26.018 14.0: mv Pietz, J. 40-cm refl. VSNET 1995 06 26.949 [13.8 mv AA Vanmunster, T. 35-cm refl. VVS 1995 06 27.026 [14.2 mv AA Schmeer, P. 20-cm SCT priv(SCH) 1995 06 27.027 14.4 mv Pietz, J. 40-cm refl. VSNET 1995 06 27.960 [13.8 mv AA Vanmunster, T. 35-cm refl. VVS 1995 06 28.027 14.4 mv Pietz, J. 40-cm refl. VSNET 1995 06 29.001 14.1 mv AA Vanmunster, T. 35-cm refl. VVS 1995 06 29.022 14.4 mv Pietz, J. 40-cm refl. VSNET 1995 06 29.069 14.6 mv TA Poyner, G. 40-cm refl. VSNET 1995 06 29.956 [14.2 mv AA Vanmunster, T. 35-cm refl. VVS IP Peg [UG, 12.0B - 16.6B] ========================== The IP Peg outburst apparently was a short-lived one, unless most of the start of the outburst has been missed (bad weather and moon-light). No eclipse timings have been received. The summary below concludes our monitoring of the current outburst. ----------------------------------------------------------------------- DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE ------------------------------------------------------------------------ 1995 06 08.994 [12.9 mv TA Vanmunster, T. 35-cm refl. CVC 43 1995 06 19.014 13.0 mv TA Vanmunster, T. 35-cm refl. CVC 43 1995 06 19.965 13.7 mv TA Vanmunster, T. 35-cm refl. CVC 43 1995 06 20.007 13.9 mv TA Vanmunster, T. 35-cm refl. CVC 43 1995 06 20.029 13.8 mv Pietz, J. 40-cm refl. priv(PIE) 1995 06 20.455 13.8 mv Royer, R. AN 209 1995 06 21.975 [13.8 mv TA Vanmunster, T. 35-cm refl. VVS 1995 06 22.019 [13.8 mv TA Diepvens, A. 15-cm refr. VVS 1995 06 24.992 [13.8 mv TA Vanmunster, T. 35-cm refl. VVS Tonny Vanmunster