[vsnet-obs 1849] CVC 77 (S10932 & V701 Tau)

[Tonny Vanmunster <tvanmuns@innet.be>]

BELGIAN ASTRONOMICAL SOCIETY V.V.S. -  Working Group Variable Stars
Cataclysmic Variables Circular No.77               1996, January 02
Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM
     Internet: tvanmuns@innet.be                  TEL. 32-11-831504
     --------------------------------------------------------------
          The CATACLYSMIC VARIABLES Home Page: hht://www.cv.psi.edu
===================================================================

S10932 [UG:+E, 13.4 - 18.5p]
============================

Taichi Kato, Ouda Station, Kyoto University, Japan reports an outburst
detection using CCD of the highly unknown eclipsing dwarf nova S10932 
(which is part of the Belgian Cataclysmic Variables Alert Programme). 

S10932 is located at R.A. = 12h39m32.1s, Decl.= +21d08'06" (J2000.0). 
A finder chart and sequence is available at the Cataclysmic Variables
Home Page.

One of the few references in professional literature on S10932 is IBVS 4182, 
in which Wenzel and Schwartz describe the object as a new eclipsing cata-
clysmic variable (likely a dwarf nova) below the period gap. Remark that
this positions S10932 amongst the few known eclipsing dwarf novae in the
northern hemisphere. According to IBVS 4182, the mid-eclipse times are :
Min.(hel.) = JD 2449486.4821 + 0.08703 E

Available observations :

1995 Dec 29.022 UT, [14.1   (T. Vanmunster, 0.35-m refl., seq: GSC);
1996 Jan 01.83  UT,  13.5V  (Ouda Team, 0.60-m refl. + CCD + V-filter);

In a follow-up message on VSNET, dated 1996, January 2nd, Kato reports a
first eclipse timing : "Preliminary analysis of CCD observations at Ouda 
Station confirms the outburst of S10932 accompanied by a deep eclipse.  The 
object is ~2.1 mag brighter in V than GSC 15.2 (12h39m24s.02 +21d14'14".8 
[J2000.0]) outside eclipses.  An eclipse was fortunately caught centered at JD
(geocentric) 2450084.34935, with a depth of ~1.3 mag and a duration of 12min.  
The profile of the eclipse is remarkably similar to those observed in HT Cas 
during the recent outburst, but with some hint of totality lasting 1-2 min.".

Needless to say that also visual observations of this CVAP object, including 
eclipse timings, are highly encouraged.


V701 Tau [UGSU, 15.0p - <21p]
=============================

Kato also reports follow-up observations of the superhump development in
V701 Tau (see CVC 76). He and his team monitored the object for another 6 hours
on New Years night. Based on these data, and data obtained on 1995, December
29, 
they revised the superhump period as 0.06891 day.

The completed photometric summary of the present outburst now becomes :

-----------------------------------------------------------------------
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 30.453  14.8   CV     *Kato & Ouda Team		     VSNET
1995 12 31.527  14.9   CV     *Kato & Ouda Team		     VSNET

Tonny Vanmunster

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp