(cba:news) V709 Cas, and a new dwarf nova
jop at astro.columbia.edu
Sat Nov 6 09:46:31 EST 1999
Dear CBAers, Nov. 6, 1999.
Time to ring down the curtain on V709 Cas = RX0028+593. A few
scattered pulse timings during the rest of the season would be useful, but
the dense campaign is over. We have enough, from Bob and the two Daves.
I think the attached note re KUV 23012+1702 merits a big response.
Let's track this puppy during and after its outburst!
And continued coverage of IP Peg and U Gem, yes, absolutely yes.
---------- Forwarded message ----------
Date: Fri, 05 Nov 1999 22:30:22 +0100 (MET)
From: Jochen Pietz <Jochen.Pietz at t-online.de>
To: vsnet-obs at kusastro.kyoto-u.ac.jp
Subject: (cba:news) [vsnet-obs 24521] KUV 23012+1702
KUV 23012+1702 1999-10-31.88 <15.5C
KUV 23012+1702 1999-11-03.89 15.7C
KUV 23012+1702 1999-11-04.79 15.4C
CCD photometry obtained between 1999-11-04.78 and 04.95 revealed
humps with an amplitude of 0.35mag. The period is about 0.082days.
BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars
Cataclysmic Variables Circular No.159 1997, December 6
Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM
Internet: tvanmuns at innet.be TEL. 32-11-831504
CVC Web Page : http://www.astro.columbia.edu/~cba/cvc
KUV 23012+1702 = a new UG in Peg [15.8B - 18.2B ?]
S. Antipin, Sternberg Astronomical Institute, Moscow, communicates :
"I would like to inform you about a new UG-type star in Peg. This
star was firstly discovered by M. Kondo, T. Noguchi and H. Maehara
(Tokyo Ann 20, No.2, p. 130, 1984) as a new blue variable object
KUV 23012+1702. No classification is given in their work.
I independently discovered and investigated this variable on Moscow
plates. The new variable definitely is a dwarf nova. Two kinds of
outbursts were found : bright ones have mag 15.8B in maximum and have
a duration of more than 8 days; faint ones have mag 16.5B in maximum
and a duration less than 4 (or 5) days. (All magnitudes are based on
the USNO A1.0 catalogue B-band scale).
The cycle is (very approximately) 27 days. It would be interesting
to know a brightness in minimum. In the USNO A1.0 catalogue, the
object is shown at mag 18.2B, but it's unsure if this really shows
the star at minimum light.
Coordinates of this object are R.A.= 23h03m41.8s, decl.= +17d17'55"
(J2000.0). This is approx. 2 degrees north of Alfa Peg. The variable
is the NE star of a pair.
A CCD spectrum of KUV 23012+1702 was obtained by G. Wegner and
J. Dupuis (AJ 106, No.1, p.390, 1993). According to their work the
object is sdBe, U-B=-0.7 mag."
Evidently, this object should be monitored in close detail for
future outbursts. It presumably is a new UGSU-type dwarf nova.
Further details on this object will shortly be published by
Sergei Antipin in an IBVS issue.
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