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[vsnet-obs 1947] CVC 78
- Date: Sat, 20 Jan 1996 01:10:58 -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, lasse.teist@thranethrane.dk400.dk, pvancaut@innet.be, bill.worraker@aea.orgn.uk, nogami@kusastro.kyoto-u.ac.jp, 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: Tonny Vanmunster <tvanmuns@innet.be>
- Subject: [vsnet-obs 1947] CVC 78
- Sender: owner-vsnet-obs@kusastro.kyoto-u.ac.jp
BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars
Cataclysmic Variables Circular No.78 1996, January 19
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: hht://www.cv.psi.edu
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S10932 [UG:+E, 13.4 - 18.5p]
============================
This interesting eclipsing dwarf nova (CVAP object) has been monitored
in close detail during its past outburst (announced in CVC 77). It
seems this was a normal outburst, given the short duration and rapid
fading, and the apparent lack of superhump observations.
Observed eclipses sometimes were very deep (up to 3.2 mag V, as reported
by T. Kato and the Ouda Team, Kyoto University, Japan). This is one of
the deepest known eclipse amplitudes known among outbursting dwarf
novae. Kato further measured the duration of eclipses (which is nearly
10 minutes). Similar deep eclipses were also reported by German astronomers
Peter Kroll and Gerold Richter of Sonneberg Observatory, who measured an
amplitude of about 4.4 mag (R band).
We received following observations of S10932 :
-----------------------------------------------------------------------
DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE
-----------------------------------------------------------------------
1995 12 29.022 [14.1 mv GSC Vanmunster, T. CVC 77
1996 01 01.83 13.5 CV Kato, T. & Ouda Team CVC 77
1996 01 02.817 14.5 mv VS Koshiro, M. VSNET
1996 01 02.89 14.8 CV Kato, T. & Ouda Team VSNET
1996 01 03.865 [13.6 mv Makiguchi, N. VSNET
A serious effort was made by Kato and his team to determine the precise
mid-eclipse times of S10932. The following ephemeris has been derived after
many successive refinements. It was published in a VSNET message dd.
January 10, 1996 :
Min.HJD = 2441798.44270 + 0.08703867378 E'
Shortly before, Peter Kroll and Gerold A. Richter of Sonneberg Observatory,
Germany, announced in a January 9, 1996 VSNET message : "The current out-
burst of S10932 led us to (re)analyse CCD observations made at Sonneberg
Observatory with a 60-cm-Cassegrain telescope from 1994, May 11 to 1996,
Jan 04. Eclipsing times published in "Wenzel, Richter, Luthardt, Schwartz:
IBVS 4182" are now improved.
Using these minima times, which are distributed over more than 20 years,
and the eclipsing times published on VSNET by Taichi Kato & Ouda team, we
could derive the following ephemerides: Min (HJD) = J.D. 2449486.48166 +
0.0870386727 * E".
V701 Tau [UGSU, 15.0p - <21p]
=============================
This is another interesting CVAP object, that recently was discovered in
outburst (see CVC 76). The photometric summary below concludes our
monitoring action of this variable. It probably is for the first time in
the history of V701 Tau that such an intensive photometry took place.
-----------------------------------------------------------------------
DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE
-----------------------------------------------------------------------
1995 12 24.951 [15.6: mv GSC Vanmunster, T. CVC 75
1995 12 25.847 14.5 mv GSC Vanmunster, T. CVC 75
1995 12 25.866 14.5 mv GSC Poyner, G. CVC 75
1995 12 25.951 14.4 mv GSC Vanmunster, T. CVC 75
1995 12 25.983 14.1 mv GSC Broens, E. CVC 75
1995 12 26.552 14.4 CV *Kato & Ouda Team VSNET
1995 12 26.951 14.4:: mv GSC Poyner, G. VSNET
1995 12 27.023 14.5: mv GSC Broens, E. VSNET
1995 12 27.577 14.6 CV *Kato & Ouda Team VSNET
1995 12 27.903 [14.3 mv GSC Broens, E. VSNET
1995 12 27.957 14.4 mv GSC Pietz, J. VSNET
1995 12 28.934 [14.3 mv GSC Broens, E. VSNET
1995 12 28.940 14.6 mv GSC Pietz, J. VSNET
1995 12 28.985 14.7 mv GSC Vanmunster, T. VSNET
1995 12 29.566 14.6 CV *Kato & Ouda Team VSNET
1995 12 29.772 [14.3 mv GSC Poyner, G. VSNET
1995 12 29.845 14.8 mv GSC *Pietz, J. VSNET
1995 12 30.453 14.8 CV *Kato & Ouda Team VSNET
1995 12 31.527 14.9 CV *Kato & Ouda Team VSNET
1996 01 02.448 15.1 CV *Kato & Ouda Team VSNET
1996 01 07.496 15.6 CV *Kato & Ouda Team VSNET
1996 01 07.813 [14.3 mv GSC *Poyner, G. VSNET
1996 01 12.656 18.6 CV *Kato & Ouda Team VSNET
1996 01 13.521 19.5 CV *Kato & Ouda Team VSNET
FS Aur [UGZ:, 14.4v - 16.2v]
============================
We received two additional observations, related to the December 1995
outburst of FS Aur (CVC 74) :
1996 01 01.422 UT, 16.8 (M. Iida, Japan, 20-cm refl.+CCD, unfiltered);
01 01.442 UT, 15.6 (M. Iida);
UNCONFIRMED OUTBURST OBSERVATIONS
=================================
Two CVAP objects recently have been reported in outburst, for which
insufficient confirmative observations were available to generate a CVC.
It concerns :
TW Tri [UGZ, 13.3p - 17.0p]
---------------------------
Reported in outburst by M. Iida, Japan, on 1996, January 1.445 UT,
using a 20-cm reflector with CCD (unfiltered), at mag 14.9.
The previous outburst of TW Tri was also detected by M. Iida, on 1995,
November 12 (CVC 70). The following visual observation, reported by M.
Moriyama, Japan relates to that outburst : 1995 Nov 15.588 UT, 14.2:
TU Tri [UG, 14.8p - <18.0p]
---------------------------
Also detected in outburst by Makoto Iida, Nagano, Japan, who recorded it
on an unfiltered CCD image on 1996, Jan. 1.455 UT at mag. 15.8.
We have created a GSC-based sequence (and corresponding large scale finder
chart) of TU Tri, which you may obtain at the Cataclysmic Variables Home
Page.
Tonny Vanmunster
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