[vsnet-alert 11331] Re: ROTSE3 J203225+602837 outburst

[Gianluca Masi]

Dear All,

I performed two hours of time-resolved photometry on this
star and the resulting lightcurve does NOT show obvious
oscillations larger than 0.05 magnitudes.

Regards,
Gianluca


----- Original Message Follows -----
From: Taichi Kato <tkato at kusastro.kyoto-u.ac.jp>
To: variable_star_forum at yahoogroups.com,
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Subject: [vsnet-alert 11328]  ROTSE3 J203225+602837 outburst
Date: Sat, 11 Jul 2009 14:56:36 +0900

>    ROTSE3 J203225+602837 outburst (the object was already
> reported in ATEL #1642).  The light curve and the
> recurrence time (~1 year?) might suggest a superoutburst.
> 
> ===
> 
> ATEL #2126                                                
>           ATEL #2126
> 
> Title:          ROTSE-III discovery of a new Cataclysmic
> Variable Author: J. Vinko, University of Texas; F. Yuan,
> University of Michigan;
>                  R.  Quimby, California Institute of
> Technology; Z. Balog, University
>                 of  Arizona; D. Chamarro, M. D. Sisson, C.
> Akerlof, S. B. Pandey,
>                 University of Michigan; J. C. Wheeler and
> E. Chatzopoulos,  University
>                 of Texas, on behalf of the ROTSE
> collaboration Queries:        yuanfang at umich.edu
> Posted: 11 Jul 2009;  5:13  UT
> Subjects:       Optical, Cataclysmic Variables, Transients
> , Variables
> 
> We report the discovery of a transient
> ROTSE3J203224.8+602837    on unfiltered CCD images taken
> on Jul. 06.82 UT with the 0.45-m ROTSE-IIId    telescope
> at the TUBITAK National Observatory at Bakirlitepe, Turkey
> , and    confirmed by the 0.45-m ROTSE-IIIb telescope at
> McDonald Observatory,    Texas. The transient was
> discovered by subtracting a reference image    constructed
> from frames taken in 2008 (limiting mag 18.5). The
> brightness    of the source was 16.05 +/- 0.1 mag
> (unfiltered, tied to USNO B1.0 R-mag)     at the time of
> discovery. The transient was subsequently detected between
> Jul. 7 and 10, declining to 16.4 +/- 0.2 mag on Jul.   
> 10.26 UT. A finder chart and the ROTSE light curve is
> posted at the    following website URL <br />  
>
http://rotse.net/rsvp/j203224.8+602837/j203224.8+602837.jpg
> <br />  
> http://rotse.net/rsvp/j203224.8+602837/rotse_lc.jpg      
> 
> At the position of the transient, R.A.=20h32m24s.76,
> Decl=+60o28'36".8 (equinox 2000.0), a faint stellar-like
> object is apparent on POSS-II images, with USNO B1.0
> magnitudes B=20.81, R=19.71 and I=18.11.  If this is the
> same object, the brightening of the transient was about 4
> mag in   the R-band. There is also an ultrasoft X-ray
> source within 4" of this position, listed in the Einstein
> IPC database, which is likely to be associated with this
> object. These strongly suggest that the transient is   a
> Cataclysmic Variable (CV).      
> 
> An optical spectrum obtained on Jul.09.24 UT at McDonald
> Obs. with the 9.2-m Hobby-Eberly Telescope (+ Marcario
> Low-Resolution Spectrograph) by   S. C. Odewahn, shows a
> smooth blue continuum with weak H-alpha emission.
> Absorption lines due to H-beta, H-gamma and NaD are also
> present.  A plot   of the spectrum can be found at the
> following URL <br />   http://rotse.net/rsvp/j203224.8+60
> 2837/het_spec_0709.jpg <br />   The appearance of the
> spectrum strengthens the classification that the  
> transient a CV, probably a dwarf nova in outburst.