[vsnet-alert 9517] Re: V713 Cep eclipses and period measurement

[Taichi Kato]

Re: V713 Cep eclipses and period measurement

> This variable was originally discovered by S.Antipin as dwarf nova on 
> the Moscow archive plates (see Antipin and Croll, 2003, IBVS 5461).  
> Only two outbursts were found (1984 Aug. 30 on Sonneberg plate and 1989 
> Oct. 30 - Nov. 5 on Moscow plates) with the star reaching 15.3 and 15.5 
> magnitude.
>
> V713 Cep is very similar to UGSU-type star DV UMa (orbital period 
> 0.085853d) which shows both the eclipses from 18.3 to 20.5 mag, 
> outbursts to 14.0-15.4 mag every 770 days and superhumps with 0.0887d 
> period.

   VSNET has received 266 observations since 2003, but no outburst
has been detected.  This is perfectly in agreement with the above
description.

   The second recorded outburst (1989) was most likely a superoutburst,
with a duration more than 6 days.  The actual maximum may have been
brighter, as expected from DV UMa observations.

> USNO-A2.0 B 
> and R magnitudes of several stars are shown. In plotting the light curve 
> above the pseudo-V (0.5*R+0.5*B) magnitudes of two comparison stars 
> (R=16.3, B=17.5 and R=16.8, B=17.8) were used.

   The following conversion constants may be helpful:

http://www.aerith.net/astro/color_conversion.html