C I as a source of continuous opacity in late B-type main-sequence stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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B Stars, Carbon, Late Stars, Main Sequence Stars, Opacity, Stellar Atmospheres, Early Stars, Interstellar Extinction, Radiative Transfer, Ultraviolet Radiation

Scientific paper

The far-UV continuous opacity of C I in late B-type main-sequence stars is calculated in LTE and non-LTE. In LTE, C I is an important source of continuous opacity below 1240 A for stars of spectral type B5 and later. In non-LTE, the C I opacity is always much less and is important only for stars of spectral type B8 or cooler. The non-LTE predictions for the emergent flux shortward of 1240 A are in reasonable agreement with the observations.

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