25417RE: [amastro] Carbon Stars
- May 14, 2017
I don’t know, but I suspect the B-V is given for whenever the photometry was done. You might be able to find different values from different surveys.
The spectrum and redness of a Carbon star changes as its light varies. Most cycle between magnitudes and are definitely redder on the way down, magnitude-wise.
Most of these stars have a B-V Index figure that does not have a range.
Shouldn't there also be a range of variation in their B-V figures?
And if so, where in the range is the B-V figure calculated? Brightest? Dimmest?
Anyone have an idea?
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