BELGIAN ASTRONOMICAL SOCIETY V.V.S. -  Working Group Variable Stars
Cataclysmic Variables Circular No.28              1995, February 26
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
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DV UMa = US 943 [UGSU:, 15.4v - 20.6v]
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Tonny Vanmunster, Landen, Belgium has detected an outburst of this
very important and poorly studied dwarf nova type cataclysmic 
variable. The observation has been confirmed both by Gary Poyner,
Birmingham, UK and Eric Broens, Mol, Belgium, as follows :

1995 02 22.845 UT, [14.4  (T. Vanmunster, 0.35-m refl., seq: GSC);
     02 26.826 UT,  14.6  (T. Vanmunster, 0.35-m refl., seq: TA);
     02 26.840 UT,  14.7  (G. Poyner, 0.40-m refl., seq: TA);
     02 26.846 UT,  14.7  (E. Broens, 0.35-m refl., seq: TA);

Only very few outbursts of the object have been reported : 1933, 
January 23; 1946, February 4; 1953, February 13 and 1987, April 30.
DV UMa is discussed in a number of publications on cataclysmic
variables. We identified references in following professional
journals :

  Howell, S., et al., 1987, PASP, 99, 126-129
  Hameury, J.M., et al., 1991, A&A, 248, 525-530
  Szkody, P., Howell, S., 1993, ApJ, 403, 743-751
  Howell, S., Szkody, P., 1990, ApJ, 356, 623-629
  Howell, S., Mason, K., et al., 1988, MNRAS, 233, 79-86
  Mukai, K., et al., 1990, MNRAS, 245, 385-391
  
Please remark that TA Sequence 881223 shows the object on the wrong
location. A correct identification and sequence appeared afterwards
as TA 941025. Both Poyner and Vanmunster noticed during the present 
outburst, that DV UMa appears somewhat to the SE of the indicated 
position.


Tonny Vanmunster