[vsnet-newvar 1716] Re: re re MisV1147 Spectral Type

[jg@jgws.freeisp.co.uk]

jg@jgws.freeisp.co.uk wrote:

> I'm pretty sure the U-B
> difference is because it is based around the Balmer Discontinuity, not
> based on a continuum with a Wien's Law relationship like B-V, but have
> no idea what is happening at the K / L "boundary". So the other colour
> indices derivable here will add nothing.

Hmmm

Apparently the U-B band covers a lot of 'metal' lines as well as being a
temperature indicator, such that plotting U-B against B-V, a temperature
indicator, shows metallicity effects relative to temperature.

You won't get this checking V-Ic versus B-V.


Cheers

John Greaves

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