Welsh-Stetson

[Tom Droege <tdroege2@earthlink.net>]

Doug Welch was kind enough to code up his algorithm in perl.  Thank you, Doug.

  I applied this to the data set I used for TN-83.  I quickly found all the 
stars I had found and 10 or so more.  With the Welch-Stetson tool, and the 
plotting tool that Rich Knowles made I was able to go through the whole 
data set in about an hour, plotting all the interesting WS output.

We are going to find a lot of short period variable stars from the 
engineering run.  I am not sure that I will want to run in the same mode 
for the future, but it gives quick gratification data.  That is fun.

OK, I am not absolutely sure yet that all these stars are variable.  It is 
still possible that chip artifacts are producing "variable" stars.  But 
chip artificts probably do not track between chips, so if there is a 
simultaneous change in V and I it is pretty convincing.  I have 18 such 
stars from the one 2.2 hour run.  There are also 9 more where only the I 
dips.  This could be an IR artifact.  We shall see.

Tom Droege