Synthetic absorption lines in cool stars and normal galaxies.

Astronomy and Astrophysics – Astronomy

Scientific paper

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Synthetic Spectra: Stellar Atmospheres, Synthetic Spectra: Cool Stars, Synthetic Spectra: Galaxies, Cool Stars: Metal Abundances, Stellar Content: Galaxies, Stellar Content: Globular Clusters

Scientific paper

The author first describes the basis of spectrum synthesis calculations where line lists with atomic and molecular constants are introduced. The accuracy of present-day available model atmospheres is also discussed. The application of synthetic spectra to reproduce the spectra of different objects is then described: the derivation of elemental and isotopic ratios is shown, including a discussion on results for the carbon, nitrogen and oxygen elements. The study of de-veiled spectra of T Tauri stars is described, where molecular bands can be used to check stellar parameters. A grid of 700 synthetic spectra together with reference stars, used through a perturbation method to study stellar populations is described. Finally the reproduction of strong features in composite spectra, and in particular, the Mg I triplet lines, the Ca II triplet lines, and TiO bands in metal-rich globular clusters and SO/E galaxies is given.

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