BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars Cataclysmic Variables Circular No.30 1995, March 06 Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM Internet: tvm@lms.be TEL. 32-11-831504 P. Van Cauteren, de Borrekenslaan 54, 2630 Aartselaar, BELGIUM 73064.1123@compuserve.COM TEL. 32-3-8774098 =================================================================== UW Tri [N: 1983, 15p - <21p] ============================ The high interest of professional astronomers in the present outburst of this object, which is on the Belgian Cataclysmic Variables Alert Programme (CVAP - see CVC No.21), has resulted in a lot of interesting email exchanges. Immediately after Gary Poyner was notified of the outburst, he con- tacted Nick James, Chelmsford, UK, who obtained a CCD image of UW Tri on 1995, March 3.8 UT. N. James used a 0.30-m f/5.25 Newtonian with Sony CCD and calculated the following precise position : R.A. = 02h45m17s.3, Decl. = +33g31'26".5 (equinox 2000.0). This is within 1".5 of the position catalogued in 'A Catalog and Atlas of Cataclysmic Variables [Downes, R.A., Shara, M.M., 1993, PASP, 105, 127-245]'. Tachi Kato, Ouda Station, Japan provided some historical discovery data on UW Tri. The discovery report by Kurochkin shows that the 1983 outburst lasted at least 32 days. Steve Howell, Planetary Science Institute, Arizona, USA confirms that UW Tri has not been studied before and that it's a good 'TOAD' (Tremendous Outburst Amplitude Dwarf Novae) candidate. Daisaku Nogami, Ouda Station, Japan has issued a call for a coordinated observation programme on UW Tri. He suspects that that the object belongs to the UGWZ Sge-type dwarf novae. A search to detect superhumps has already been started, as part of a systematic photometry research program- me on UW Tri, using continuous V-band CCD photometry with a time resolution of 60 sec. Additional observations covering the present outburst : ----------------------------------------------------------------------- DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE ------------------------------------------------------------------------ 1995 03 01.815 [15.1 mv GSC Vanmunster, T. 35-cm refl CVC 29 1995 03 03.819 14.7 mv GSC Vanmunster, T. 35-cm refl CVC 29 1995 03 03.828 14.7 mv GSC Broens, E. 35-cm refl CVC 29 1995 03 03.833 14.9 mv GSC Poyner, G. 40-cm refl CVC 29 1995 03 03.882 14.6 mv GSC Vanmunster, T. 35-cm refl CVC 29 1995 03 04.503 15.2 CU GSC Iida, M. 16-cm+ST-6 VSNET 1995 03 04.790 14.6 mv GSC Vanmunster, T. 35-cm refl VVS 1995 03 04.815 14.3: mv GSC Broens, E. 35-cm refl VVS 1995 03 04.833 14.7 mv GSC Vanmunster, T. 35-cm refl VVS 1995 03 05.803 14.7 mv GSC Poyner, G. 40-cm refl VSNET 1995 03 06.474 15.4 CU GSC Iida, M. 16-cm+ST-6 VSNET V632 Cyg [UGSS, 12.6p - 17.5p] ============================== Laszlo Szentasko, Veresegyhaz, Hungary reports a possible outburst of V632 Cyg, which subsequently has been confirmed by Tonny Vanmunster, Landen, Belgium. 1995 03 02.145 UT, 12.9: (L. Szentasko, 0.33-m refl.); 03 04.146 UT, 14.0 (T. Vanmunster, 0.35-m refl., seq: AAVSO); 03 04.146 UT, 14.0 (T. Vanmunster); 03 07.135 UT, 14.4 (T. Vanmunster); This dwarf nova was last seen in outburst on 1994, October 25 by T. Vanmunster and E. Broens. It then reached mag. 13.7. Tonny Vanmunster