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Sebastian Otero wrote:
> I am using Hog (2000) tranformations as stated in the catalogue:
>
> V = Vt-0.09*(Bt-Vt)
> B-V = 0.85*(Bt-Vt)
Some time ago, Arne Henden provided these transformations
to the TASS group. He has stated recently that they aren't
as good as possible, but they are the best I have at the moment.
Given color -0.2 < (Bt - Vt) < 1.8
B = Bt + 0.018 - 0.2580*(Bt - Vt)
V = Vt + 0.008 - 0.0988*(Bt - Vt)
As a bonus, he threw conversions to U, R and I (though of course
these are less accurate than the others, since they extrapolate
quite a distance across the spectrum).
You can read his message explaining the conversions at
http://stupendous.rit.edu/tass/mailarchive/2001-02/msg00055.html
Michael Richmond
Return to the Powerful Daisaku
vsnet-adm@kusastro.kyoto-u.ac.jp
