[vsnet-alert 1448] CVC 161 [SBS 1017+533 new UGSU star]

[Tonny Vanmunster <tvanmuns@innet.be>]

BELGIAN ASTRONOMICAL SOCIETY V.V.S. -  Working Group Variable Stars
Cataclysmic Variables Circular No.161             1998, February 01
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
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SBS 1017+533 [UGSU, 13? - 16?]
==============================

Peter Garnavich recently reported his detection of an outburst of
SBS 1017+533 [VSNET alert 1441].  He also reported spectral observations,
showing broad Balmer absorption lines, but weak Halpha emission.

Unfiltered CCD photometry by Tonny Vanmunster, CBA Belgium Observatory,
on 1998, January 31, using a 0.25-m telescope and ST-7 CCD camera,
reveals the existence of a periodic modulation in this system, which
has the typical signature of a superhump. It therefore is most likely 
that SBS 1017+533 is a new member of the SU UMa-type cataclysmic 
variables !

Our observations were made under quite unfavourable conditions (strong
windws), during a 7.8h observing session and show a periodic signal 
at 0.069 +/- 0.001 d, with a mean semi-amplitude of 0.11 mag, after
heliocentric correction and removal of a linear trend of decline
(period determined using the PDM method).

SBS 1017+533 is located at RA = 10h20m26.65s and decl = +53d04'32.6"
(Epoch J2000.0).

Follow-up time-series CCD photometry is highly recommended.


Editorial Absence
-----------------

Please note that the Editor will be absent in the period from
February 9th till February 17th, 1998.


Tonny Vanmunster

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