[vsnet-alert 9732] Re: OT_J080714.2+113812: new dwarf nova in Cnc

[Patrick Schmeer]

The new dwarf nova OT J080714.2+113812 is probably identical with
the following catalog entries:
SDSS J080714.25+113812.5 08:07:14.26 +11:38:12.5 g=20.941 r=20.954
USNO-B1.0 1016-0154084   08:07:14.23 +11:38:11.6 B2=20.08 R2=20.08
GSC2.3 N89Z011023        08:07:14.32 +11:38:11.3 F=19.76 Bj=20.74 
 
The photometry in quiescence indicates a blue object (the NW
component of a faint double star on DSS images).
The outburst amplitude (7 magnitudes) and duration suggest a
WZ Sge-type dwarf nova at supermaximum.
 
Regards,
Patrick

--- Taichi Kato <tkato at kusastro.kyoto-u.ac.jp> wrote:
>    Forwarded.  The object was not recorded in outburst in available
> ASAS-3 data.  This mught indicate that outbursts are relatively rare.
> Time-resolved photometry is strongly encouraged.
> 
> ===
> 
>   Itagaki-san detected a possible new variable in Cnc.  It is located
> at 8:07:14.25, +11:38:12.7 (J2000.0), which was mag 13.6 (unfiltered
> CCD) on Nov. 13.71 UT.  His survey image taken on Oct. 2.796 UT does
> not show any object brighter than mag about 17.  K. Kadota, Ageo,
> Saitama, Japan, confirmed the existence of the object (unfiltered mag
> 13.7 on Nov. 15.67 UT).  Itagaki supplys additional photometries;
> Nov. 16.688 UT, 13.8; 19.619, 14.1.
> 
> Following our request, H. Naito, Nishi-Harima Astronomical
> Observatory, took a low-resolution (410 - 670 nm, R = 330 at H_alpha)
> spectrum of this object on Nov. 16.77 UT with the 2.0-m NAYUTA
> telescope.  It shows a smooth blue continuum with Balmer lines in
> absorption.  Core of the H_alpha absoption is filled by the emission
> component.  It suggests that it is a dwarf nova in outburst.
> 
> Cheers,
> Hitoshi
> 
> ===
> 
> OT_J080714.2+113812 20071113.71 136C KIt
> OT_J080714.2+113812 20071115.67 137C Kdt
> OT_J080714.2+113812 20071116.688 138C KIt
> OT_J080714.2+113812 20071119.619 141C KIt



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