GSC 00445-01993

[Michael Koppelman <lolife@bitstream.net>]

Hello.

This is the TASS star I've been working on lately. I got some data last 
night and that means more questions. The plot of all the data is here:

http://www.lolife.com/astronomy/gsc445-1993/20020628.jpg

I thought, "What the heck is up with all the scatter at the beginning of 
the night?" So I tried an experiment. I deleted all observations that were 
more than 1 standard deviation from the average, using K-C as my guide. 
This, of course reduced by standard deviation of what was left. Then I did 
this again. After these two iterations, I was left with a standard 
deviation of less than 1%. A plot of this is here:

http://www.lolife.com/astronomy/gsc445-1993/clean.jpg

Question one would be: am I doing a statistical no-no by playing with this?
  I understand that I may be removing some actual variation, but it seems 
like an interesting exercise nonetheless.

The scatter at the beginning was still there on the variable, even though 
there is virtually no scatter on K-C. So I went into Mira and did an 
ensemble solution (using only K and C as my ensemble) of just the 
beginning of the night (using all the data, not the pruned data). That 
plot is here:

http://www.lolife.com/astronomy/gsc445-1993/detail.jpg

You can see clearly that the variable is varying much more than C or K. I 
suspect this is near the top hump of the curve, but to me it looks like 
there is some substantial flickering going on here. Is this significant?

Cheers,
Michael Koppelman
http://www.lolife.com/astronomy/