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 --------------------------------------------------------------------------- * 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 --------------------------------------------------------------------------- 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 --------------------------------------------------------------------------- * 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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