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[vsnet-alert 1003] CVC 144 (V630 Cyg, T Leo, SX LMi, DM Lyr, V844 Her, VW CrB)
- Date: Mon, 16 Jun 1997 23:38:42 +0200 (MET DST)
- To: tvanmuns@innet.be
- From: Tonny Vanmunster <tvanmuns@innet.be>
- Subject: [vsnet-alert 1003] CVC 144 (V630 Cyg, T Leo, SX LMi, DM Lyr, V844 Her, VW CrB)
- Sender: owner-vsnet-alert@kusastro.kyoto-u.ac.jp
BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars
Cataclysmic Variables Circular No.144 1997, June 16
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
===================================================================
There has apparently been quite some dwarf nova activity during
our absence. This circular lists photometric data of recently
active dwarf novae, that either appear on the CVAP list or on the
TA/BAAVSS Recurrent Objects Programme.
V630 Cyg [UGSU, 13.4p - 17.2p]
==============================
Gene Hanson reports an outburst detection of this UGSU-type dwarf
nova, that is part of the Belgian CVAP Programme. His observations
have been confirmed by Tonny Vanmunster (unfiltered CCD camera) at
CBA Belgium Observatory.
1997 Jun 09.019 UT, <15.5 (G. Poyner);
Jun 11.431 UT, 14.5 (G. Hanson);
Jun 12.405 UT, 14.3 (G. Hanson);
Jun 13.456 UT, 14.4 (G. Hanson);
Jun 14.455 UT, <14.9 (G. Hanson);
Jun 15.413 UT, 15.1 (G. Hanson);
Jun 15.899 UT, 15.0 (T. Vanmunster, unfilt. CCD);
V630 Cyg was last seen in outburst on 1996, Aug 10 [CVC 103] by
P. Skalak, when the object reached mag 14.0 [CVC 107]. That
outburst proved to be a superoutburst, during which for the
first time superhumps were observed in this system. The Ouda
team, Kyoto University, Japan derived a superhump period of
0.079 +/- 0.003 d [CVC 105].
T Leo [UGSU, 10B - 15.7B]
=========================
A short outburst of T Leo was detected by Robert Modic, USA and
Gene Hanson, USA. Their observations are listed below. The previous
outburst of T Leo was seen on 1997, Feb 19 [CVC 129] -also by Robert
Modic- and turned out to be a superoutburst.
1997 Jun 09.09 UT, <15.0 (J. Bortle, AAVSO);
Jun 09.155 UT, 14.5 (R. Modic);
Jun 09.198 UT, 14.1: (R. Modic);
Jun 09.201 UT, <14.6 (G. Hanson);
Jun 10.094 UT, 11.2 (J. Bortle, AAVSO);
Jun 10.139 UT, 11.5 (R. Modic);
Jun 10.161 UT, 11.3 (G. Hanson);
Jun 10.180 UT, 11.5 (R. Modic);
Jun 10.181 UT, 11.3 (G. Hanson);
Jun 10.235 UT, 11.3 (G. Hanson);
Jun 11.149 UT, 13.2 (R. Modic);
Jun 11.156 UT, 13.1 (G. Hanson);
Jun 12.136 UT, <12.5 (R. Modic);
Jun 15.138 UT, <14.1 (R. Modic);
The object now seems to have returned to quiescence, though conti-
nuous monitoring for rebrightenings is highly encouraged.
SX LMi [UGSU, 16B]
==================
SX LMi underwent a short and faint outburst at the end of May 1997,
as indicated by the observations below. The object was last seen
in outburst on 1997, Apr 6 [CVC 131], which was a superoutburst
[CVC 132], during which the superhump period was derived [CVC 133].
1997 May 23.921 UT, <14.4 (G. Poyner)
May 24.921 UT, <14.4 (G. Poyner)
May 25.942 UT, <14.4 (G. Poyner)
May 28.899 UT, 14.0 (J. Pietz)
May 29.101 UT, 14.35 (CCDV, R. Zissell);
May 29.933 UT, 14.6: (G. Poyner)
May 30.934 UT, 14.8::(G. Poyner);
DM Lyr [UGSU, 13.6p - 18p]
==========================
The DM Lyr outburst, announced in CVC 142, is over now. It was
a very short and faint outburst.
1997 May 24.972 UT, <14.9 (G. Poyner);
May 25.216 UT, <14.8 (G. Hanson);
May 25.913 UT, 15.1 (T. Vanmunster);
May 25.933 UT, 14.9: (G. Poyner);
May 25.954 UT, 15.0: (G. Poyner);
May 26.040 UT, 14.9 (G. Poyner);
May 26.228 UT, 15.3: (G. Hanson);
May 27.208 UT, <14.8 (G. Hanson);
May 27.440 UT, <15.3 (G. Hanson);
May 28.231 UT, <15.3 (G. Hanson);
May 29.004 UT, <15.4 (G. Poyner);
May 29.447 UT, <15.3 (G. Hanson);
V844 Her = Var43 Her [UGSU, 12.5p - 17.5p]
==========================================
V844 Her now seems to have returned to quiescence (near mag 17) but
remains active in terms of (super)humps, as indicated by observations
recently obtained at CBA West (D. Harvey).
The photometric summary below concludes the present monitoring
action.
1997 May 23.901 UT, 12.6 (P. Schmeer);
May 23.910 UT, 13.5 (T. Kinnunen);
May 23.924 UT, 12.91 (L. T. Jensen, unfilt. CCD);
May 23.951 UT, 13.6 (G. Poyner);
May 24.191 UT, 13.3 (R. J. Modic);
May 24.953 UT, 14.0 (G. Poyner);
May 24.964 UT, 12.92 (L. T. Jensen, unfilt. CCD);
May 25.974 UT, 14.0 (G. Poyner);
May 26.337 UT, 14.1 (R. J. Modic);
May 27.326 UT, 14.1 (R. J. Modic);
May 28.215 UT, 14.2 (R. J. Modic);
May 28.985 UT, 14.4 (G. Poyner);
May 29.966 UT, 14.4 (G. Poyner);
May 30.969 UT, 14.5 (G. Poyner);
May 31.012 UT, 13.55 (L.T. Jensen, unfilt. CCD);
May 31.963 UT, 13.59 (L.T. Jensen, unfilt. CCD);
Jun 01.013 UT, 13.59 (L.T. Jensen, unfilt. CCD);
Jun 01.957 UT, 14.4 (G. Poyner);
Jun 03.963 UT, 14.7 (G. Poyner);
Jun 04.035 UT, 13.7 (P. Schmeer);
Jun 04.101 UT, 15.1 (R. J. Modic);
Jun 05.340 UT, 16.4 (R. J. Modic);
Jun 06.285 UT, <16.7 (R. J. Modic);
Jun 07.965 UT, <14.9 (G. Poyner);
Jun 08.199 UT, <16.4 (R. J. Modic);
Jun 08.967 UT, <16.2 (G. Poyner);
Jun 09.169 UT, <17.1 (R. J. Modic);
Jun 10.285 UT, 17.4 (R. J. Modic);
Jun 11.156 UT, <16.2 (R. J. Modic);
Jun 12.158 UT, <15.6 (R. J. Modic);
Jun 15.180 UT, <16.7 (R. J. Modic);
VW CrB = Var21 CrB [UGSU, 14.5 - <17.5p]
========================================
This interesting UGSU type dwarf nova has returned to quiescence.
The table below summarizes available observations, which complement
tables in earlier CVC editions.
1997 May 12.91 UT, 14.2 (J. Pietz);
May 12.954 UT, 14.05 (L. Jensen, superhump max, unfilt. CCD);
May 13.028 UT, 14.15 (L. Jensen, superhump max, unfilt. CCD);
May 15.883 UT, 14.49 (L. Jensen, unfilt. CCD);
May 16.890 UT, 14.58 (L. Jensen, unfilt. CCD);
May 23.947 UT, <14.8 (G. Poyner);
May 24.045 UT, 15.7 (L. Jensen, unfilt. CCD);
May 24.934 UT, 15.7 (L. Jensen, unfilt. CCD);
May 24.93 UT, <14.4 (J. Pietz);
May 25.93 UT, 15.2 (J. Pietz);
May 25.970 UT, <15.2 (G. Poyner);
May 28.889 UT, 15.7 (L. Jensen, unfilt. CCD);
May 28.95 UT, 15.4 (J. Pietz);
May 30.888 UT, 16.0 (L. Jensen, unfilt. CCD);
May 31.908 UT, 16.2 (L. Jensen, unfilt. CCD);
Jun 01.954 UT, <15.5 (G. Poyner);
Tonny Vanmunster
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