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[vsnet-obs 1455] CVC 67 (DV Dra a/o)
- Date: Mon, 30 Oct 1995 23:30:25 -0100
- To: observations@aavso.org, j.bortle@genie.geis.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, extpasc@rz.uni-sb.de, safnet@mesiob.obspm.fr, KFA02524@niftyserve.or.jp, sno@iris.elte.hu, vsnet-obs@kusastro.kyoto-u.ac.jp, NAH01147@niftyserve.or.jp, ebroens@innet.be, fidusz@alba.zpok.hu
- From: tvanmuns@innet.be (Tonny Vanmunster)
- Subject: [vsnet-obs 1455] CVC 67 (DV Dra a/o)
- Sender: owner-vsnet-obs@kusastro.kyoto-u.ac.jp
BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars
Cataclysmic Variables Circular No.67 1995, October 30
Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM
Internet: tvanmuns@innet.be TEL. 32-11-831504
===================================================================
DV Dra [UGWZ?, 15.0B - <21p]
============================
Makoto Iida, Nagano, Japan has detected an outburst of the most interesting
CVAP object DV Dra, as reported by M. Watanabe (VSOLJ) and T. Kato, Ouda
Observatory, Kyoto University, Japan. DV Dra is a suspected WZ Sge-type
dwarf nova, that was discovered as a new cataclysmic variable in 1984 by
Pavlov and Shugarov. The observation by M. Iida is the first ever detected
since the discovery of the variable, as we could derive from the "Outburst
Activity Database on Selected Cataclysmic Variables" [1].
DV Dra is located at R.A. = 18h17m24.98s, Decl.=+50d48'14.5" (J2000.0) [2],
and is included in Howell's list of suspected TOADs [3].
The following preliminary observations are available, and seem to indicate
that the object is on the rising branch of its light-curve :
1995 Oct 30.398 UT, 17.8 CU (M. Iida, 0.20-m refl.+CCD ST-6);
Oct 30.405 UT, 17.5 CU (M. Iida);
Oct 30.411 UT, 17.2 CU (M. Iida);
In IBVS 3626 [4], W. Wenzel presents a detailed analysis of the light-curve of
the June 1984 discovery outburst. The variable was found to be brighter than
about mag 17.3 B for at least 28 days, with a maximum brightness (mag 15.0 B) on
June 1st, 1984. On the basis of the shape and duration of the outburst, the
scarcity of eruptions, and the distance to the galactic plane, W. Wenzel
concludes that DV Dra is a long-cycle dwarf nova, perhaps belonging to the
WZ Sge type.
It is evident that photometric follow-up observations are highly encouraged.
References
----------
[1] Vanmunster, T., Howell, S.B., 1995, in preparation.
[2] Downes, R.A., Shara, M.M., 1993, PASP, 105, 127-245.
[3] Howell, Szkody, Cannizzo, 1995, ApJ, 439, 337.
[4] Wenzel, W., IBVS 3626
V630 Cyg [UGSU:, 13.4p - 17.2p]
===============================
Further to the outburst announcements in CVC 65 and CVC 66, additional
detection reports were received from Gary Poyner, Birmingham, UK and
J. Pietz, Erftstadts, Germany. The long duration of the present outburst,
which is summarized in the photometry table below, seems to indicate it
very likely concerns a superoutburst.
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DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE
-----------------------------------------------------------------------
1995 10 19.945 [15.2 mv AA Broens, E. 35-cm refl. CVC
1995 10 20.627 [13.4 mv Moriyama, M. 33-cm refl. CVC
1995 10 20.888 [14.1 mv Poyner, G. 40-cm refl. CVC
1995 10 20.971 [15.2 mv AA Broens, E. 35-cm refl. CVC
1995 10 21.763 14.2 mv AA Vanmunster, T. 35-cm refl. CVC
1995 10 21.774 14.3 mv AA Broens, E. 35-cm refl. CVC
1995 10 21.838 14.1 mv AA Broens, E. 35-cm refl. VSNET
1995 10 21.844 14.3 mv Poyner, G. 40-cm refl. VSNET
1995 10 21.845 14.7 mv Pietz, J. 40-cm refl. VSNET
1995 10 22.778 [14.9 mv Pietz, J. 40-cm refl. VSNET
1995 10 22.779 [14.9 mv AA Vanmunster, T. 35-cm refl. CVC
1995 10 23.825 [14.9 mv AA Broens, E. 35-cm refl. VSNET
1995 10 23.883 [14.9 mv AA Vanmunster, T. 35-cm refl. CVC
1995 10 23.884 [14.9: mv Pietz, J. 40-cm refl. VSNET
1995 10 24.606 [14.5 mv Moriyama, M. 33-cm refl. CVC
1995 10 24.803 [14.9: mv Pietz, J. 40-cm refl. VSNET
1995 10 24.834 [14.9 mv AA Broens, E. 35-cm refl. VSNET
1995 10 25.610 [14.5 mv Moriyama, M. 33-cm refl. CVC
1995 10 25.815 14.0 mv AA Broens, E. 35-cm refl. CVC
1995 10 25.854 14.9: CV AA Van Cauteren, P 40-cm+CCD+V CVC
1995 10 25.870 14.7 mv Pietz, J. 40-cm refl. VSNET
1995 10 25.932 14.6 mv AA Vanmunster, T. 35-cm refl. CVC
1995 10 26.463 14.4 CU Iida, M. 20-cm+CCD VSNET
1995 10 27.867 14.0 mv Poyner, G. 40-cm refl. VSNET
1995 10 28.933 14.0 mv Poyner, G. 40-cm refl. VSNET
1995 10 28.864 14.2 mv AA Vanmunster, T. 35-cm refl. VSNET
1995 10 29.980 14.4 mv Poyner, G. 40-cm refl. VSNET
V632 Cyg [UGSS, 12.6p - 17.5p]
==============================
Jochen Pietz also reported an independent outburst detection of V632 Cyg
(see CVC 66). The photometric summary below concludes our monitoring of
the present outburst.
-----------------------------------------------------------------------
DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE
-----------------------------------------------------------------------
1995 10 23.824 [15.3 mv AA Broens, E. 35-cm refl. VSNET
1995 10 23.882 [15.3 mv AA Vanmunster, T. 35-cm refl. CVC
1995 10 24.603 14.7: mv Moriyama, M. 33-cm refl. CVC
1995 10 24.802 [14.6 mv Pietz, J. 40-cm refl. VSNET
1995 10 24.832 [15.3 mv AA Broens, E. 35-cm refl. priv(BRO)
1995 10 25.609 14.6: mv Moriyama, M. 33-cm refl. CVC
1995 10 25.812 14.2 mv AA Broens, E. 35-cm refl. CVC
1995 10 25.852 14.8: CV AA Van Cauteren, P 40-cm+CCD+V CVC
1995 10 25.870 14.0 mv Pietz, J. 40-cm refl. VSNET
1995 10 25.933 14.0 mv AA Vanmunster, T. 35-cm refl. CVC
1995 10 26.463 14.3 CU Iida, M. 20-cm+CCD VSNET
1995 10 27.865 14.9 mv Poyner, G. 40-cm refl. VSNET
1995 10 28.932 14.6 mv Poyner, G. 40-cm refl. VSNET
1995 10 28.865 [14.6 mv AA Vanmunster, T. 35-cm refl. VSNET
1995 10 29.979 [14.6 mv Poyner, G. 40-cm refl. VSNET
V1060 Cyg [UGSS, 13.5p - 18p]
=============================
V1060 Cyg apparently underwent an extremely long and bright outburst
(CVC 65), as one can easily derive from the table of observations below.
It now definitely seems to be on its return.
-----------------------------------------------------------------------
DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE
-----------------------------------------------------------------------
1995 10 20.604 12.8 mv KA Moriyama, M. 33-cm refl. VSNET
1995 10 20.649 12.8 mv KA Moriyama, M. 33-cm refl. VSNET
1995 10 21.585 13.0 mv KA Moriyama, M. 33-cm refl. VSNET
1995 10 21.797 13.1 mv KA Broens, E. 35-cm refl. CVC
1995 10 21.882 13.0 mv KA Vanmunster, T. 35-cm refl. CVC
1995 10 22.757 13.4 mv KA Pietz, J. 40-cm refl. VSNET
1995 10 23.510 13.9 CU Iida, M. 20-cm + CCD VSNET
1995 10 23.779 13.4 mv KA Pietz, J. 40-cm refl. VSNET
1995 10 23.821 13.4 mv KA Broens, E. 35-cm refl. VSNET
1995 10 24.583 13.2 mv KA Moriyama, M. 33-cm refl. VSNET
1995 10 24.778 13.5 mv KA Pietz, J. 40-cm refl. VSNET
1995 10 24.839 13.7 mv KA Broens, E. 35-cm refl. VSNET
1995 10 25.599 13.4 mv KA Moriyama, M. 33-cm refl. VSNET
1995 10 25.781 13.7 mv KA Pietz, J. 40-cm refl. VSNET
1995 10 25.845 13.7 mv KA Broens, E. 35-cm refl. VSNET
1995 10 27.849 14.6 mv KA Poyner, G. 40-cm refl. VSNET
V542 Cyg [UGSS:, 13.0p - 18.3:p]
================================
Entries marked with an '*' sign in the photometric summary below indicate
new observations of V542 Cyg, received since the table presented in CVC 64.
This dwarf nova is in its declining phase too.
-----------------------------------------------------------------------
DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE
-----------------------------------------------------------------------
1995 10 14.03 [15.1 mv AA Bortle, J. CVC 64
1995 10 17.035 15.1 mv AA Bortle, J. CVC 64
1995 10 17.081 15.1 mv AA Bortle, J. CVC 64
1995 10 18.013 15.0 mv AA Bortle, J. CVC 64
1995 10 19.113 14.6 mv AA Bortle, J. CVC 64
1995 10 19.781 14.1 mv AA Szentasko, L. 33-cm refl. CVC 64
1995 10 19.957 13.7 mv AA Broens, E. 35-cm refl. CVC 64
1995 10 20.019 13.8 mv AA Vanmunster, T. 35-cm refl. CVC 64
1995 10 20.581 14.2 mv Moriyama, M. 33-cm refl. VSNET
1995 10 20.7 13.8 mv AA * Szentasko, L. 33-cm refl. VSNET
1995 10 20.83 13.8 mv AA * Szabo, R. 25-cm refl. VSNET
1995 10 20.978 13.6 mv AA * Broens, E. 35-cm refl. VSNET
1995 10 21.452 14.1 CU Iida, M. 20-cm+ST-6 VSNET
1995 10 21.588 14.0 mv Moriyama, M. 33-cm refl. VSNET
1995 10 21.7 13.8 mv AA * Szentasko, L. 33-cm refl. VSNET
1995 10 21.764 13.6 mv AA * Pietz, J. 40-cm refl. VSNET
1995 10 21.767 13.4 mv AA Vanmunster, T. 35-cm refl. VSNET
1995 10 21.835 13.7 mv * Poyner, G. 40-cm refl. VSNET
1995 10 21.845 13.6 mv AA * Broens, E. 35-cm refl. VSNET
1995 10 21.9 13.8 mv AA * Szabo, R. 25-cm refl. VSNET
1995 10 22.7 13.8 mv AA * Szentasko, L. 33-cm refl. VSNET
1995 10 22.768 13.7 mv AA * Pietz, J. 40-cm refl. VSNET
1995 10 23.493 13.7 CU * Iida, M. 20-cm + CCD VSNET
1995 10 23.769 13.7 mv AA * Pietz, J. 40-cm refl. VSNET
1995 10 23.802 13.5 mv AA * Broens, E. 35-cm refl. VSNET
1995 10 24.594 14.0 mv * Moriyama, M. 33-cm refl. VSNET
1995 10 24.793 13.6 mv AA * Pietz, J. 40-cm refl. VSNET
1995 10 24.842 13.6 mv AA * Broens, E. 35-cm refl. VSNET
1995 10 25.587 13.7 mv * Moriyama, M. 33-cm refl. VSNET
1995 10 25.779 13.7 mv AA * Pietz, J. 40-cm refl. VSNET
1995 10 25.849 13.7 mv AA * Broens, E. 35-cm refl. VSNET
1995 10 27.873 14.0 mv * Poyner, G. 40-cm refl. VSNET
1995 10 28.916 14.4 mv * Poyner, G. 40-cm refl. VSNET
1995 10 29.860 [13.9 mv AA * Vanmunster, T. 35-cm refl. VSNET
1995 10 29.974 14.8 mv * Poyner, G. 40-cm refl. VSNET
TW Tri [UGZ, 13.3p - 17.0p]
===========================
A number of additional observations and corrections were received, since
the publication of a photometric summary of TW Tri in CVC 63.
-----------------------------------------------------------------------
DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE
-----------------------------------------------------------------------
1995 10 16.948 13.6 mv GSC Vanmunster, T. 35-cm refl. CVC 63
1995 10 17.339 13.8 mv Scovil, C. CVC 63
1995 10 17.528 13.8 CU GSC *Iida, M. 20-cm + ST-6 VSNET
1995 10 18.202 13.7 mv Scovil, C. CVC 63
1995 10 18.857 14.0 mv GSC Broens, E. 35-cm refl. VSNET
1995 10 19.911 14.4 mv GSC Broens, E. 35-cm refl. VSNET
1995 10 20.677 14.2 mv Moriyama, M. 33-cm refl. VSNET
1995 10 21.488 error -- GSC *Iida, M. 20-cm + ST-6 VSNET
1995 10 21.854 [14.8 mv GSC Vanmunster, T. 35-cm refl. VSNET
1995 10 25.469 15.7 CU GSC *Iida, M. 20-cm + ST-6 VSNET
1995 10 26.560 15.6 CU GSC *Iida, M. 20-cm+CCD VSNET
1995 10 27.473 16.1 CU GSC *Iida, M. 20-cm+CCD VSNET
Tonny Vanmunster
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