[vsnet-chat 5675] B-V question

["Arend Van Werven" <awerven@broward.edu>]

Hello,

Is it possible to get R and IR values of a star if you only know V an
B-V ?
How would I calculate that and how accurate would it be ?
Also, should I use Guide 7 magnitudes or is it better to use the values
that Simbad returns.
I want to do differential photometry of a eclipsing binary in V, R, and
I, and I want the differences to be meaningful and as close to true
color magnitude as possible.
Thank you for any help.

Arno van Werven
Buehler Observatory

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