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Re: GSC 00279 00321 paper

So if I get the coordinates of my comp stars and then find them in the 
DS23 CD and get average TASS magnitudes and redo my photometry, that's 
better? I think Dirk used a GSC star as his comp star, too. Can I just use 
the same one comp star as Dirk and report the comp star as GSC whatever 
and leave it at that? How much accuracy do we need in the differential 
magnitudes when our goal is to say "this is a W UMa-type varible"?

What is the definitive source for photometric V-band magnitudes in general?


On Wednesday, June 12, 2002, at 10:39  AM, aah@nofs.navy.mil wrote:

>   In fact, I have problems with all of the magnitudes listed for
> the photometry.  First, I would use the TASS-derived V magnitudes
> for the comp stars rather than their GSC values.  If you are going
> to continue using the GSC values, you need to investigate at minimum
> whether the GSC is on the V-band system in this field.