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CYGV337 20030705.358 <180CR Scp (USNO-A2.0 sequence)
CYGV337 20030707.352 170CR Scp
Although Jan Manek determined a mean cycle length of 32 days
no outbursts of this dwarf nova have been reported to VSNet
since his detection of the 1997 Aug. 20 outburst (see below).
Regards,
Patrick
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* Date: Thu, 12 Sep 1996 10:09:30 +0200
* To: vsnet@kusastro.kyoto-u.ac.jp
* From: Jan Manek <jmanek@mbox.vol.cz>
* Subject: [vsnet 782] V337 Cyg
Hi all,
once more regarding V337 Cyg.
I have just finished measuring of the scan of outburst plate and get
following position using 10 GSC stars:
19 59 52.88 +39 13 59.0 (2000.0)
with uncertainity + - 0.4" in both coordinates. This is in excellent
agreement with Bruce Sumner's position of the candidate he measured
on DSS.
Below you can also find JD dates of outbursts I found (not checked all
possible plates in Sonneberg plate archive). Individual outbursts are
separated by blank line. There were 6 outbursts (not only 3 as I mentioned
earlier) recorded. There seems to be recurrence period about 30 days.
2446977.481
47263.575
47329.488
.500
47331.473
.489
47365.461
47368.509
47391.480
47592.669
Regards, Jan
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Date: Thu, 21 Aug 1997 09:28:18 +0200
To: vsnet-alert@kusastro.kyoto-u.ac.jp
From: Jan Manek <jmanek@mbox.vol.cz>
Subject: [vsnet-alert 1146] Outburst of V337 Cyg
Cc: vsnet-obs@kusastro.kyoto-u.ac.jp
Observation by Jan Manek (MEK)
V337 Cyg Aug 20.9516 15.60 outburst (no doubt)
65cm reflector+CCD+V filter
I would like to point out that this is the first live event observed
for this star. Follow up observations are needed. I mentioned
in [vsnet 782] that periodicity is 30 days but more probably it
is around 32 days.
I have also remeasured position of this star on two of this night CCD
frames and position using 10 stars from GSC 1.2 is following:
19h 59m 52.96s +39o 13' 59.8" (2000.0)
+-0.01 +-0.1
Regards, Jan
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* Date: Fri, 22 Aug 1997 22:45:11 +0200 (MET DST)
* To: tvanmuns@innet.be
* From: Tonny Vanmunster <tvanmuns@innet.be>
* Subject: [vsnet-alert 1152] CVC 146 (V337 Cyg)
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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