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[vsnet-obs 774] CVC 46 (V542 Cyg)

BELGIAN ASTRONOMICAL SOCIETY V.V.S. -  Working Group Variable Stars
Cataclysmic Variables Circular No.46                  1995, July 17
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
===================================================================

V542 Cyg [UGSS:, 13.0p - 18.3:p]
================================

Tonny Vanmunster, Landen, Belgium reports an outburst detection of
V542 Cyg, which is on the Recurrent Objects Programme of TA/BAAVSS.
Confirmation has come from Eric Broens, Mol, Belgium. CVC 23 briefly 
discusses remarks on the classification of V542 Cyg as a dwarf nova.

1995 Jul 10.053 UT, [13.9 (T. Vanmunster, 0.35-m refl., seq: AAVSO);
     Jul 13.906 UT, [13.5 (T. Vanmunster, strong moonlight);
     Jul 14.955 UT,  13.8 (T. Vanmunster, moonlight);
     Jul 15.997 UT,  13.9 (T. Vanmunster);
     Jul 16.894 UT,  13.9 (T. Vanmunster);
     Jul 16.945 UT,  13.7 (E. Broens, 0.35-m refl., seq: AAVSO);

V542 Cyg was last reported in outburst on December 21, 1994 by Gary
Poyner, UK [CVC 23] and reached maximum brightness (mag. 13.4) the
day after. The outburst lasted for more than 10 days [CVC 25].
A photometric summary, covering a much brighter outburst of V542 Cyg
in June 1994, which lasted approximately 12 days, is given in CVC 9.


BC UMa [UGSU, 10.9B - 18.3B]
============================

The BC UMa outburst, reported in CVC 45, apparently was a normal
outburst, as communicated by Janet Mattei, AAVSO : "The following 
observations [completed with other ones submitted over VSNET - Ed.]
indicate that the recent outburst of BC UMa has ended. This outburst 
was a short one, lasting a little more than 2 days.

BC UMA 950702.965  UT <14.0  G. Poyner, BAA,AAVSO
       950705.8       <14.0  L. Szentasko, VSNET
       950706.1576     14.0  D. York, AAVSO
       950706.1694     13.9  York
       950706.1868     13.8  York
       950706.2076     13.4  York
       950706.2292     13.0  York
       950706.8576     13.0  Szentasko
       950707.10       12.4  G. Dyck, AAVSO
       950707.1542     13.2  York
       950707.1708     13.2  York
       950707.2347     13.0  T. Burrows, AAVSO
       950707.86       14.2  Szentasko
       950708.23      <13.6  Burrows
       950708.24      <13.6  Burrows
       950708.25      <13.6  Burrows
       950708.86       15.1  Szentasko
       950708.89      <13.6  J. Gunther, AFOEV, AAVSO (via VSNET)
       950710.2535    <15.5  R. Royer, AAVSO
All observations were made using the AAVSO sequence."

Janet Mattei further adds : "BC UMa has been closely monitored by the AAVSO 
since 1971.  Observations in the AAVSO International Database indicate that 
BC UMa has had only the following four long outbursts (superoutbursts?) 
since 1971:   May 1982, September 1990, August 1992, and April 1994, each 
lasting between 7 to 9 days. In addition, there are several unconfirmed, 
single observations, in the BC UMa data files.  From the short duration of 
the recent well-monitored outburst, there is a possibility that some of the 
short outbursts may have been missed, and that the single, positive 
observations may be part of short outbursts."
    

Tonny Vanmunster