1973•The Astrophysical JournalRequires access

Stellar model chromospheres. On the temperature minima of F, G, and K stars.

Jeffrey L. Linsky, T. R. Ayres

Abstract

Brightness temperatures are deduced for the Hiv and Kiv features of the Ca ii resonance lines in Procyon (F5 IV-V), Arcturus (K2 IlIp), and the Sun (G2 V). The brightness temperatures of Procyon and the Sun are in the same ratio as their effective temperatures, suggesting a simple scaling law for the temperature minima of F and early G stars. Arcturus departs from this law in a way that can be explained by CO line blanketing. Subject headings: Ca ii emission - chromosphere, solar chromospheres, stellar - late-type stars

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Key concepts: Physics, Stars, Astrophysics, Chromosphere, Brightness, Stellar atmosphere, Astronomy, Effective temperature