Connection between nonradial pulsations and stellar winds in massive stars. VII - Variable absorption components in UV spectra of early-type stars

Astronomy and Astrophysics – Astronomy

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Absorption Spectra, Early Stars, Spectral Energy Distribution, Stellar Oscillations, Ultraviolet Spectra, Abundance, B Stars, Hertzsprung-Russell Diagram, Line Spectra, O Stars, Periodic Variations, Statistical Analysis, Stellar Models, Stellar Structure, Stellar Winds

Scientific paper

The frequent presence of blue-shifted, discrete absorption components represents one of the major concerns in the interpretation of mass-loss indicating spectral lines in ultraviolet spectra of O, B, and Be stars. This summary is mainly concerned with the principal properties of discrete absorption components in the ultraviolet resonance lines of early-type stars. Discrete narrow absorption lines in the UV are discussed along with statistical considerations, individual studies, and models. It is concluded that the structure of stellar winds of early-type stars cannot be understood without understanding the origin of the discrete absorption components in the ultraviolet resonance lines.

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