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[vsnet-obs 3350] CVC 102 (V1028 Cyg, WX Cet, DM Lyr, Var25 Oph)
- Date: Thu, 08 Aug 1996 22:20:11 -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 3350] CVC 102 (V1028 Cyg, WX Cet, DM Lyr, Var25 Oph)
- Sender: owner-vsnet-obs@kusastro.kyoto-u.ac.jp
BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars
Cataclysmic Variables Circular No.102 1996, August 8
Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM
Internet: tvanmuns@innet.be TEL. 32-11-831504
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The CATACLYSMIC VARIABLES Home Page: http://vsnet.cv.psi.edu
===================================================================
V1028 Cyg [UGSU, 13.0p - 18p]
=============================
Marc Biesmans, Essen, Belgium reports his visual detection of an
outburst of this interesting dwarf nova. An independent detection
report has been received from Jochen Pietz, Germany.
1996 Aug 05.880 UT, [16.6 (T. Vanmunster, CBA Belgium, unfilt.CCD exp);
Aug 07.048 UT, [15.6 (M. Biesmans, Belgium);
Aug 07.899 UT, 13.6 (M. Biesmans);
Aug 07.86 UT, 14.1 (J. Pietz);
Aug 07.87 UT, 14.0 (J. Pietz);
Aug 07.90 UT, 14.0 (J. Pietz);
Aug 07.93 UT, 13.9 (J. Pietz);
Aug 07.96 UT, 13.9 (J. Pietz);
Aug 08.028 UT, 13.5 (M. Biesmans);
Confirmative observations were already obtained at the Ouda Observa-
tory at Kyoto University, Japan. Hajime Baba communicates in a VSNET
message : "We, Ouda team, observed V1028 Cyg on August 8.50 with a CCD
with V filter attached to a 60-cm reflector. Our observation confirms
that V1028 Cyg is undergoing an outburst. Judging from the quick-look
images, the object looks as bright as V~14.0, although very preliminary.
This indicates that this outburst seems to be a normal one ?"
Jochen Pietz also detected the previous (super)outburst of V1028 Cyg,
which was seen on 1995, July 28 [CVC 48]. That time, the object became
as bright as magnitude 12.7 [CVC 51, CVC 52]. The Ouda team at Kyoto
University, Japan, furthermore succeeded in detecting superhumps in
V1028 Cyg, hence classifying the dwarf nova as an UGSU-type cataclysmic
variable. We refer to CVC 51 for a full account of the reported super-
humps and their evolution over time.
Additionally, the star showed a post-outburst brightening [CVC 53],
a phenomenon which should be looked for during the present outburst
as well.
WX Cet [UGWZ, 9.5v - 17.5v]
===========================
The WX Ceti outburst, announced in our previous circular, received
good photometric coverage, as indicated by the following communica-
tion from Jonathan Kemp, CBA, Columbia University, Dept. of Astronomy :
"July 18-23 photometry over a 9-hr longitude range from CBA-Belgium
(Tonny Vanmunster) and Cerro Tololo (Jonathan Kemp and Susan Kassin)
shows conclusively that the superhump period is 85.37 +- 0.05 min.
This is essentially the fourth-best period solution in the data of
O'Donoghue et al. (1991 MNRAS), and illustrates well the difficulty of
period-finding from a single observing site. The superhump period
exceeds the orbital (spectroscopic) period by 1.7%, fairly normal for
these short-Porb dwarf novae.
Other measured properties appear normal too: the star declined at a
rate 0.12 mag/d, and the superhump has smoothly declined from 0.25 to
0.14 mag full amplitude."
Some further photometric observations :
-----------------------------------------------------------------------
DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE
-----------------------------------------------------------------------
1996 07 17.080 [11.9 mv Schmeer, P. CVC 101
1996 07 17.646 12.0 mv A. Jones CVC 101
1996 07 17.656 11.8 mv A. Jones CVC 101
1996 07 17.684 11.8 mv A. Jones CVC 101
1996 07 17.731 11.6 mv A. Jones CVC 101
1996 07 18.078 11.6 mv P. Schmeer CVC 101
1996 07 18.083 11.2 mv D. Overbeek VSNET
1996 07 18.087 12.0 mv B. Monard CVC 101
1996 07 18.129 12.0 mv B. Monard CVC 101
1996 07 19.015 11.8 mv B. Monard VSNET
1996 07 19.079 11.9 mv P. Schmeer VSNET
1996 07 19.093 11.9 mv P. Schmeer VSNET
1996 07 20.085 11.9 mv P. Schmeer VSNET
1996 07 21.072 12.0 mv P. Schmeer VSNET
1996 07 22.059 12.0 mv P. Schmeer VSNET
1996 07 24.751 12.88 CV Ouda Station VSNET
1996 07 26.794 12.96 CV Ouda Station VSNET
1996 07 27.743 12.96 CV Ouda Station VSNET
1996 07 28.751 13.08 CV Ouda Station VSNET
1996 07 29.751 13.25 CV Ouda Station VSNET
1996 07 30.777 13.82 CV Ouda Station VSNET
DM Lyr [UGSU, 13.6p - 18p]
==========================
The table below is a continuation of the photometric summary on
DM Lyr, listed in CVC 99. The variable has now returned to its
minimum state :
-----------------------------------------------------------------------
DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE
-----------------------------------------------------------------------
1996 07 10.020 14.3 mv Broens, E. VSNET
1996 07 10.937 14.2: mv Broens, E. VSNET
1996 07 11.962 14.2 mv Broens, E. VSNET
1996 07 12.936 14.2 mv Broens, E. VSNET
1996 07 13.917 14.4 mv Broens, E. VSNET
1996 07 15.892 15.0 mv Broens, E. VSNET
1996 07 17.907 <14.8 mv Broens, E. VSNET
1996 07 17.971 15.2 mv Poyner, G. VSNET
1996 07 18.006 14.8 mv Day, J. VSNET
1996 07 18.022 15.56 CU Jensen, L. VSNET
1996 07 18.563 14.9 mv Takahashi VSNET
1996 07 18.885 <14.8 mv Broens, E. VSNET
1996 07 18.978 15.79 CU Jensen, L. VSNET
1996 07 21.989 <14.9 mv Day, J. VSNET
1996 07 21.952 <14.9 mv Poyner, G. VSNET
1996 07 22.151 <14.9 CU Ouimet, P. priv
1996 07 21.020 <14.6 mv Day, J. VSNET
1996 07 23.976 <16.5 CU Jensen, L. VSNET
1996 07 24.958 <15.4 mv Poyner, G. VSNET
1996 07 25.451 18.0:C CV Kato et al. VSNET
Var25 Oph [UG, 15.0 - <21.0p]
=============================
We received 3 additional observations on the Var25 Oph outburst,
including one by L. Jensen, Denmark, that is a correction to
an earlier observation (also included in CVC 101).
-----------------------------------------------------------------------
DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE
-----------------------------------------------------------------------
1996 07 15.940 <17.1 CU Jensen, L. *Correction* VSNET
1996 07 16.966 <17.1 CU Jensen, L. VSNET
1996 07 18.538 <169 CU Iida, M. VSNET
Tonny Vanmunster