BELGIAN ASTRONOMICAL SOCIETY V.V.S. -  Working Group Variable Stars
Cataclysmic Variables Circular No.91                 1996, April 26
Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM
     Internet: tvanmuns@innet.be                  TEL. 32-11-831504
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         The CATACLYSMIC VARIABLES Home Page: http://www.cv.psi.edu
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CI UMa [UGSU, 13.8p - 18.8V]
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Tonny Vanmunster, Center for Backyard Astrophysics (CBA) Belgium,
reports his CCD detection of an outburst of CI UMa. This interesting
object is part of the CVAP.

Available observations :

1996 Apr. 22.860 UT, [14.1  mv (T. Vanmunster, 0.35-m refl., seq: GSC);
1996 Apr. 25.963 UT,  15.07 CU (T. Vanmunster, 0.25-m SCT, unfiltered
                                ST-7 CCD image);

CI UMa was last seen in outburst by Lasse Jensen, Denmark, on 1995,
Sep. 27 [CVC 60], when the object reached mag. 14.0.

During the January 1995 superoutburst of CI UMa (which was first noticed
by J. Pietz, Germany), Daisaku Nogami, Ouda Station, Kyoto University,
Japan, obtained time resolved CCD photometry of the object, using a 60-cm
reflector. Superhumps with an amplitude of 0.21 mag were clearly present,
and 4 superhump maxima were observed during a 6 hours photometry session.
From this, a superhump period of 0.0626 +/- 0.0005 day was determined.


Tonny Vanmunster