Re: NSV 10892 Photometry

[Tom Droege <tdroege2@earthlink.net>]

One more thing.

If you look at TN-88 you will see why I am concerned about the 
calibration.  I can change V-Ic by doing something that should not change 
it if everything were properly calibrated.

Tom Droege

At 04:32 PM 8/25/02 +0000, you wrote:
>Dirk Terrell wrote:
> >
> > On Sat, 24 Aug 2002 11:14:33 -0500, Michael Koppelman wrote:
> >
> > >So a 1/4 magnitude difference in the minima is not enough of a
> > >temperature difference to create a slight color difference that
> > >might explain what we've observered?
> > >
> >
> > If the difference in minima is that large, then there could be some
> > color change. But with a difference that large, I question the EW
> > classification. What's the period of this thing?
> >
> > Dirk
>
>what quarter of a mag diff. at min?  this is not shown in
>http://www.lolife.com/astronomy/gsc445-1993/fig2_all.jpg
>which is a nice graph by the way.
>
>There's 0.05 mag V diff in maxima, but that's the eponymous O'Connell
>"effect" again.
>
>Cheers
>
>John G