Re: Data reduction methodology for V-I colors

[Michael Koppelman <lolife@bitstream.net>]

Sweet. In it you say:

> One may reduce a fraction of the TASS Mark IV data in the traditional 
> manner, as long as one restricts the analysis to really good nights. 
> One must estimate the extinction coefficient, since the observational 
> procedure doesn't give enough leverage to deduce it from the data 
> itself. The results are fair: the scatter in V-band has a floor around 
> 0.05 mag, and in I-band around 0.04 mag. The quality of the photometry 
> decreases in crowded fields, and there is a systematic error for stars 
> fainter than V=12.5 or so. I think that we can correct for this error, 
> but that remains to be seen.

It sounds to me like the idea has some merit!

Cheers,
Michael

On Aug 31, 2004, at 12:22 PM, Stupendous Man wrote:

>  Yes.  Read Tech Note 98:
>
>      http://stupendous.rit.edu/tass/technotes/tn0098.html
>
>                                             Michael Richmond