Re: GSC 1040-399 + new variable

["Thomas Droege" <tdroege2@earthlink.net>]

One of the uses of the tass data is to find good comparison stars.  Several
of us are working to filter the tass data to find the stars that do not
seem to vary.  In a way this might be as useful as the variable data.  ;^)

Tom 


> [Original Message]
> From: Michael Koppelman <lolife@bitstream.net>
> To: Tass <tass@listserv.wwa.com>
> Date: 7/16/2003 11:13:06 AM
> Subject: Re: GSC 1040-399 + new variable
>
> Let's see if I can get my TASS nomenclature right. This is 
> TassJ190656.0+083710.4 (aka GSC 1040-0431). Tass does have data and it 
> appears to have similar flickering. I'll play with this in TS and see 
> if it is indeed periodic. There are close companions but my apertures 
> did not include them. At this point I think this variation is probably 
> real. (I've said that before, though!)
>
> Converting the Tycho mags I get B-V=0.444. Tass has average V-Ic=0.561. 
> This implies a spectral type around F4 or so. 2MASS has J=9.426, 
> H=9.221 and K=9.049.
>
> Michael Koppelman
>
>
> On Wednesday, July 16, 2003, at 10:37 AM, Michael Koppelman wrote:
>
> > In the process one of my (would be) comp stars turned up variable. I 
> > don't know if this is a noted TASS star or not, but we should have 
> > some data. The amplitude is very small and the period very short so I 
> > don't know what it is. See:
> >
> > http://www.lolife.com/astronomy/gsc1040-431.jpg
> >
> > It does not appear to be a known variable.
>