[vsnet-obs 2421] CVC 87 (SX LMi, UV Per, KW And, DX And)

[Tonny Vanmunster <tvanmuns@innet.be>]

BELGIAN ASTRONOMICAL SOCIETY V.V.S. -  Working Group Variable Stars
Cataclysmic Variables Circular No.87                 1996, March 19
Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM
     Internet: tvanmuns@innet.be                  TEL. 32-11-831504
     --------------------------------------------------------------
         The CATACLYSMIC VARIABLES Home Page: http://vsnet.cv.psi.edu
===================================================================

SX LMi [UGSU, 13 - 17.4V]
=========================

SX LMi is a most interesting UGSU-type dwarf nova, which recently has been
added to the CVAP, on request of several professional astronomers. It is
now reported in outburst by Lasse Jensen, Farum, Denmark. Although his
observation has NOT YET BEEN CONFIRMED, we have decided to issue this cir-
cular, given the high interest in this object. Confirmative observations 
are most urgently required.

1996 Mar 15.828 UT, [14.5  (T. Vanmunster, 0.35-m refl., seq: GSC);
     Mar 18.853 UT,  13.5  (L. Jensen, Denmark);


SX LMi is located at : R.A. = 10h54m30.49s, Decl. = +30d06'09.3"  (J2000.0).
A finder chart and sequence are available on the Cataclysmic Variables
Home Page.

SX LMi initially has been classified as a novalike variable (e.g., "A Catalog 
and Atlas of Cataclysmic Variables", Downes & Shara). However, in December
1994, 
Jeff W. Robertson (Indiana University Astronomy) announced in a message on
VSNET 
that the object had been on the RoboScope program for some time and that several
outbursts already had been observed. At the moment of the announcement, SX LMi 
underwent another (bright) outburst, which was intensively studied by the Ouda 
Team at Kyoto University, Japan. Shortly afterwards, Ouda team member Masuda 
reported : "SX LMi was observed this morning (1994, Dec. 16) at the Ouda
Station 
with a 0.6-m refl. + CCD. The observation revealed superhumps with an amplitude 
of 0.3 mag. Preliminary reduction gives as best estimate for the superhump
period 
a value of 100 min. By this observation, SX LMi is for the first time
identified 
as a member of SU UMa stars." 

According to data listed in the Outburst Activity Database on Selected Cata-
clysmic Variables, SX LMi was last reported in outburst on April 5, 1995, by
Jochen Pietz, Germany, when it reached mag. 13.6.



UV Per [UGSU, 11.0v - 17.5v]
============================

We have been informed by Janet Mattei, AAVSO, through AAVSO News Flash No. 5,
that UV Per has begun to brighten again, after it had returned to a minimum 
state - following the outburst announced in our previous CVC. Please keep a 
close eye on UV Per, especially during this most interesting stage of its 
outburst behaviour.

The present rise to a new maximum is very well depicted in a light curve of
UV Per, which we have compiled on the basis of 25 photometric observations.
It is presented on the Cataclysmic Variables Home Page.


KW And [UG, 14.8p - 22p]
========================

This dwarf nova has returned to quiescence, after its recent outburst (CVC 85).
A photometric summary is presented below :

-----------------------------------------------------------------------
DATE (UT)       MAGN   MS SEQ  OBSERVER        REMARKS        SOURCE
-----------------------------------------------------------------------
1996 03 09.810 [14.7   mv      Vanmunster, T.                 CVC 85
1996 03 10.822  15.0   mv      Vanmunster, T.                 CVC 85
1996 03 10.831  14.8   mv      Broens, E.                     CVC 85
1996 03 11.821  14.8:  mv      Broens, E.                     VVS
1996 03 12.420  14.9   CV      Ouda Team                      VSNET
1996 03 15.815 [15.0   mv      Vanmunster, T.                 VVS
1996 03 17.831 [14.0   mv      Poyner, G.                     VSNET


DX And [UG, 10.9p - 16.4p]
==========================

The DX And outburst, first announced in CVC 84, has been very well covered.
It seems to have been a bright and long outburst, as one can easily deduce
from the light curve, which we have published on the Cataclysmic Variables
Home Page (based on 26 photometric observations, received from amateurs
world wide).


Tonny Vanmunster

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