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Progress in High S/N Spectroscopy and its Importance for Stellar Modelling

Published online by Cambridge University Press:  12 April 2016

P.E. Nissen
P.E. Nissen*
Affiliation:
Institute of Physics and Astronomy, University of Århus, DK-8000 Århus C, Denmark

Abstract

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Recent advances in high S/N spectroscopy are reviewed with particular emphasis on new data for the abundances of chemical elements of importance for the modelling of stellar interiors.

It seems well established that young, nearby B-type stars have abundances of CNO elements that are about a factor of two lower than in the Sun except for a small fraction of nitrogen-rich stars. The existence of such stars among main sequence stars remains to be explained.

Among normal A-type stars (excluding Am and Ap stars) large deviations from solar abundance ratios occur with interesting anticorrelations of the abundances of C and Si. This suggests that diffusion processes and/or gas-dust separation of the chemical elements in the protostellar cloud play an important rôle.

Type
II. Atmospheres, a window to the interior
Information
International Astronomical Union Colloquium , Volume 137: Inside the Stars , 1993 , pp. 108 - 121
Copyright
Copyright © Astronomical Society of the Pacific 1993

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