Re: GSC 4414-1210

[Michael Koppelman <lolife@bitstream.net>]

I got a 6 hour run on this last night. Gotta like stars with high 
declinations. The results are still a bit confusing to me. See:

http://www.lolife.com/astronomy/gsc4414-1210/gsc4414-1210.jpg

The error bars are 0.013 and are the average error reported by Mira for 
the faintest comp star, which had an average S/N of about 86. I used 
the comp stars from Arne's sequence and unfortunately the brightest 
comp star is still 1m fainter than the program star. The above plot is 
ensemble photometry using just two comp stars, labeled 1 and 2 on the 
chart here:

http://www.lolife.com/astronomy/gsc4414-1210/GSC4414_chart.pdf

I tried to avoid faint companions by my choice of apertures.

The 1-sigma for the comp star magnitudes is about 0.009, so the error 
bars are just about 2-sigma. The 1-sigma of the program star magnitudes 
is 0.013 with an average of 11.25. I also tried differential photometry 
against the brightest comp star with AIP4Win
and the 1-sigma of the program star was still about 0.013.

This is fairly similar to my other night of data on this and i can't 
say with certainty that this star is really variable, based on my data 
alone, although the bump near the beginning of the night looks like it 
may be statistically real. Gary Billings's data seemed much more 
conclusive. Did you ever get a chance to reduce that, Gary?

Thoughts?

Michael Koppelman