[vsnet-alert 1152] CVC 146 (V337 Cyg)

[Tonny Vanmunster <tvanmuns@innet.be>]

BELGIAN ASTRONOMICAL SOCIETY V.V.S. -  Working Group Variable Stars
Cataclysmic Variables Circular No.146               1997, August 22
Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM
     Internet: tvanmuns@innet.be                  TEL. 32-11-831504
     CVC Web Page : http://vsnet.astro.columbia.edu/~cba/cvc
===================================================================

V337 Cyg [UG:, 14.4p - <16.5p]
==============================

Jan Manek, Stefanik Observatory, Czech Republic, reports his detection 
by CCD of an outburst of this very interesting dwarf nova, which is 
part of the Belgian Cataclysmic Variables Alert Programme (CVAP).
Lasse Jensen, CBA Denmark has been able to confirm the outburst.
The available observations are as follows :

1997 Aug 15.966 UT, <14.4   (G. Poyner, 0.40-m refl., visual);
     Aug 19.873 UT, <16.3   (T. Vanmunster, 0.25-m refl., unfilt CCD);
     Aug 20.951 UT,  15.60V (J. Manek, 0.65-m refl., CCD+V);
     Aug 21.849 UT,  15.7   (L. Jensen, 0.25-m refl., unfilt CCD);


V337 Cyg was discovered by Walter Baade in 1928 (Astron. Nach. 232, 
65). Jan Manek apparently already studied V337 Cygni's outburst
behaviour in quite some detail back in 1996. In a September 1996
VSNET message he wrote, as a result of a screening he did of plates
in the Sonneberg plate archive : "I have found V337 Cyg in at least 3 
outbursts, being usually less than 5 days long and reaching about mag
15 in maximum on blue plates. In minimum it is below the plate limit 
(< 18 mag pg). Plate scans were made for both (maximum and minimum) 
states." Manek later announced 3 more outbursts on archive plates and 
noticed a recurrence period of about 32 days.

Accurate astrometry by Manek reveals following coordinates (J2000.0) :
R.A. = 19h59m52.96s, Decl.= +39d13'59.8".

Since previous outbursts of V337 Cyg have not been studied in detail,
it is of extreme importance to monitor the present outburst as
intensively as possible.


Tonny Vanmunster

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