Contribution of interstellar matter to line widths of Ca II lines in spectra of late-type stars.

Astronomy and Astrophysics – Astronomy

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Stellar Spectra: Interstellar Matter, Stellar Spectra: Calcium Lines, Spectra: Late-Type Stars

Scientific paper

The contribution of interstellar matter to line widths of emission Ca II H and K lines in spectra of late-type stars is considered. The authors found that interstellar matter contribute to line widths of late-type Ca II H and K lines, and that in the physical interpretation of the Wilson-Bappu effect as well as in studies of stellar chromospheres in these lines, this effect should be taken into account.

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