[Aavso-photometry] GJ436b comp stars...constant over time?

[Shawn Dvorak]

Tom Krajci wrote:
> A bunch of folks have been working on GJ436b for some time.  Two comp 
> stars are most often used:  HIP 57103 (3 - 4 arcminutes NE) and GSC 
> 1984-1884 (3 - 4 arcmin N).
>
> Have these comps shown any variability over time?
>
> Thanks in advance.
>
> -------------------------------------------
> Tom Krajci
> Cloudcroft, New Mexico
> http://picasaweb.google.com/tom.krajci
>
> http://overton2.tamu.edu/aset/krajci/
>
> Center for Backyard Astrophysics (CBA)
> http://cbastro.org/ CBA New Mexico
>
> American Association of Variable Star
> Observers (AAVSO): KTC http://www.aavso.org/
> -------------------------------------------
>
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>   
Tom,

I've done two nights on GJ436 this season using a four-star ensemble of 
GSC 1984 2006, GSC 1984 2050 (= HIP 57103), GSC 1984 1884, and GSC 1984 
1928.  None of them showed any variation at the 0.01 mag level.

Shawn