Stellar temperature and stellar appearance in sunsets?

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Stellar temperature and stellar appearance in sunsets?

Post by PlutonianEmpire on Tue Feb 26, 2013 11:10 pm

Straight-forward question, I guess.

Assuming standard conditions of 1 bar atmosphere pressure at the surface on a habitable planet, on a clear day at observer location, does the spectral type/temperature of a star influence how it appears to a human observer during sunsets (eg, cooler sun appears redder)?

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Re: Stellar temperature and stellar appearance in sunsets?

Post by Sirius_Alpha on Tue Feb 26, 2013 11:34 pm

I would assume so. Rayleigh scattering preferentially scatters shorter wavelengths of course. I don't know how noticeable changes in the star's temperature would be at sunset though. From what I've been able to figure out, until stars get down to below 3000 K, they tend to look white to the eye.

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Re: Stellar temperature and stellar appearance in sunsets?

Post by Lazarus on Wed Feb 27, 2013 12:40 pm

I've been meaning to work up some code that would let me play around with this kind of thing for some time. Never got round to it though.

Planetary Habitability Laboratory give us http://phl.upr.edu/library/media/sunsetofthehabitableworlds - not sure how accurate that is though.

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Re: Stellar temperature and stellar appearance in sunsets?

Post by Sunchaser on Wed Feb 27, 2013 10:18 pm

I think that picture is supposed to depict what each star's angular size would be...although some are redder than others.

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