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[vsnet-obs 4576] CVC 117 (V493 Lyr, DX And, EG Cnc, QY Per)
- Date: Mon, 16 Dec 1996 23:28:07 -0100
- To: observations@aavso.org, JBortle@aol.com, guy@tahq.demon.co.uk, tkato@kusastro.kyoto-u.ac.jp, gp@star.sr.bham.ac.uk, pvancaut@innet.be, bill.worraker@aea.orgn.uk, nogami@kusastro.kyoto-u.ac.jp, safnet@mesiob.obspm.fr, KFA02524@niftyserve.or.jp, vsnet-obs@kusastro.kyoto-u.ac.jp, NAH01147@niftyserve.or.jp, ebroens@innet.be, fidusz@alba.zpok.hu, sno@iris.elte.hu
- From: Tonny Vanmunster <tvanmuns@innet.be>
- Subject: [vsnet-obs 4576] CVC 117 (V493 Lyr, DX And, EG Cnc, QY Per)
- Sender: owner-vsnet-obs@kusastro.kyoto-u.ac.jp
BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars
Cataclysmic Variables Circular No.117 1996, December 16
Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM
Internet: tvanmuns@innet.be TEL. 32-11-831504
===================================================================
V493 Lyr [UG, 13.2 - 18.0p]
===========================
Jochen Pietz, Germany and Lasse Jensen, Denmark independently report
their visual detection of an outburst of V493 Lyr. This quite
remarkable object (see below) is included in the TA/BAAVSS Recurrent
Objects Programme. Available observations at present :
1996 Dec 13.069 UT, [14.1 (G. Hanson);
Dec 14.71 UT, 14.7 (J. Pietz);
Dec 14.76 UT, 14.7 (J. Pietz);
The previous outburst of V493 Lyr was observed by J. Pietz on November
20, 1995 [CVC 72], when the object reached mag. 13.5 [CVC 72]. As noted
by Tonny Vanmunster, Belgium in a VSNET message on November 27, 1995,
this variable showed brightness variations of nearly 0.5 magnitudes
in narrow time intervals, during that outburst. Experienced visual
observers recorded this event several times.
It would of course be extremely interesting to closely monitor the
present outburst of V493 Lyr (preferably by CCD), in order to determine
if this behaviour is re-occuring.
DX And [UG, 10.9p - 16.4p]
==========================
The ongoing DX And outburst, first announced in CVC 116, seems to be a
quite unusual one, due to its faintness. The variable did not yet become
brighter than mag. 12.7 during the present outburst, which is the
faintest recorded maximum magnitude of DX And in the Outburst Activity
Database on Selected Cataclysmic Variables, except for an outburst
in January 1981 (when a maximum magnitude of 12.9 was reported). Since
the outburst isn't over yet, we strongly advise to keep on monitoring
this object.
-------------------------------------------
DATE (UT) MAGN MS OBSERVER
-------------------------------------------
1996 11 08.223 14.9 mv Modic
1996 12 09.042 13.8 mv Griese
1996 12 09.157 13.8 mv Griese
1996 12 10.101 13.9 mv Modic
1996 12 11.388 13.40 CV Ouda
1996 12 12.209 13.5 mv Hanson
1996 12 12.260 13.5 mv Hanson
1996 12 12.70 13.4 mv Pietz
1996 12 13.230 13.6 mv Hanson
1996 12 13.685 13.0 CU Jensen
1996 12 13.922 13.2 mv Broens
1996 12 13.979 12.9 mv Vanmunster
1996 12 14.283 13.7 mv Hanson
1996 12 14.544 13.4 mv Makiguchi
1996 12 14.70 13.4 mv Pietz
1996 12 14.950 13.4 mv Vanmunster
1996 12 15.81 12.7 mv Verdenet
EG Cnc [UGSU, 11.9v - 17:v]
===========================
EG Cnc definitely is fading, as indicated by the observations in
the photometric summary below, which is a continuation of the table
presented in CVC 116. A rebrightening of EG Cnc in the coming week or
two is not unlikely at all, and has been observed in other variables
with long recurrence times. Despite the unfavourable conditions in the
next two weeks (full moon), we encourage visual and CCD observers to
give EG Cnc top priority and to immediately report a possible brightening.
-------------------------------------------
DATE (UT) MAGN MS OBSERVER
-------------------------------------------
1996 12 09.680 12.60 CV Ouda
1996 12 11.757 12.82 CV Ouda
1996 12 11.820 12.8 mv Itoh
1996 12 12.250 12.7 mv Hanson
1996 12 12.616 12.7 mv Moriyama
1996 12 12.910 12.6 mv Schmeer
1996 12 13.267 13.0 mv Hanson
1996 12 13.812 13.23 CV Ouda
1996 12 13.933 13.06 CU Jensen
1996 12 13.972 13.4 mv Broens
1996 12 14.00 13.4 mv Pietz
1996 12 14.058 13.2 mv Vanmunster
1996 12 14.10 13.3 mv Pietz
1996 12 14.303 13.8 mv Hanson
1996 12 14.783 14.34 CV Ouda
1996 12 14.840 13.9 mv Itoh
1996 12 14.92 14.6 mv Pietz
1996 12 14.93 14.5 mv Kinnunen
1996 12 15.099 13.7 mv Schmeer
1996 12 15.210 13.8 mv Schmeer
1996 12 15.23 14.96 CV Kemp (CBA)
1996 12 15.627 [14.7 mv Takahasho
1996 12 16.06 15.3 mv Kinnunen
QY Per [UG, 14.2p - <20p]
=========================
The outburst observation of QY Per on Dec 07.88 UT by J. Pietz,
Germany, reported in our previous CVC, has not been confirmed.
Approximately 3 nights later, on Dec 11.401 UT, the variable
was fainter than mag V=16.63, following a CCD image at Ouda
Observatory, Kyoto University, Japan. Several negative visual
observations were reported in the nights following December 11
too.
Tonny Vanmunster