1973•The Astrophysical JournalRequires access

Comparison of Celescope magnitudes with model-atmosphere predictions for A, F, and G supergiants.

S. B. Parsons, E. Peytremann

Abstract

Ultraviolet data from OAO-2 are analyzed with respect to three different sets of model atmospheres. We find that (1) A( A2 supergiants are in good agreement with model atmospheres; (2) late A and early F supergiants are fainter than predicted, requiring very heavy line absorption andlor additional continuous opacity sources; and (3) the two GO supergiants are considerably brighter than expected, implying a B-type companion in one case (HR 4511) and chromospheric emission in the other (HR 2786). Subject headings:atmospheres, stellar - chromospheres, stellar - luminous stars - spectra, ultraviolet

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Key concepts: Supergiant, Physics, Astrophysics, Red supergiant, Stellar atmosphere, Stars, Atmosphere (unit), Opacity