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[vsnet-alert 887] CVC 137 (Var21 CrB, RU LMi)

BELGIAN ASTRONOMICAL SOCIETY V.V.S. -  Working Group Variable Stars
Cataclysmic Variables Circular No.137                  1997, May 09
Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM
     Internet: tvanmuns@innet.be                  TEL. 32-11-831504
     CBA Belgium Web Page : http://vsnet.astro.columbia.edu/~cba/be
===================================================================

Var21 CrB [UG, 14.5 - <17.5p]
=============================

Tonny Vanmunster, CBA Belgium reports his detection by CCD of an 
outburst of this CVAP object.

1997 May 9.030 UT, <16.0  (G. Poyner, 0.40-m refl.);
     May 9.880 UT,  14.1  (T. Vanmunster, 0.25-m SCT, unfilt. CCD);

Var21 CrB was last seen in outburst on 1997, Jan 28 by Lasse Jensen,
CBA Denmark [CVC 128], at mag. 15.5 (unfiltered CCD image). The
object underwent a bright outburst in August 1996 [CVC 104], but
failed to reveal any superhumps, despite CCD coverage [CVC 107].

Var21 CrB was discovered by S.V. Antipin [IBVS 4343], who announced
two types of outbursts : short ones and long (>15d) ones. The
photometric data suggest that the short ones are not necessarily 
fainter than the long ones. Var21 CrB is located at : R.A. = 
16h00m03s.7 and Decl. = +33d11'15" (J2000.0).


RU LMi [UG, 13.8p - 19.5p]
==========================

The RU LMi outburst, reported in our previous circular, received
only little attention. This is an overview of all available data.
The object has now returned to quiescence.

1997 May 2.886 UT,  16.30 (R. Diethelm, CCD, AAVSO NF 143);
     May 3.90  UT, <15.4  (T. Kinnunen, visual);
     May 4.88  UT,  14.9  (T. Kinnunen);
     May 5.100 UT,  14.5  (J. Griese, visual, AAVSO NF 143);
     May 5.226 UT,  14.8  (G. Hanson, seq: AAVSO, visual);
     May 6.897 UT,  14.9: (G. Poyner, 0.40-m refl.);
     May 8.179 UT, <14.8  (G. Hanson);
     May 8.92  UT, <15.4  (T. Kinnunen);


Tonny Vanmunster

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