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Theoretical Constraints from Asteroseismological High S/N Observations

Published online by Cambridge University Press:  19 July 2016

W. Däppen
W. Däppen*
Affiliation:
Observatoire de Paris-Meudon, 92195 Meudon, France

Abstract

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The two firmly established cases of many-mode observations, the Sun and Kurtz's Ap stars, suggest that in stars extremely small pulsation amplitudes are to be expected. If spectroscopic Doppler techniques are used to measure the velocity pattern, then it is obvious that with better resolution and higher S/N ratio of the spectral lines the sensitivity to detect velocity amplitudes increases. Observed pulsation frequencies of any star will put new constraints on the theory of stellar evolution. Besides addressing the two most important issues, namely determination of age and chemical composition, observed periods will also help resolve open questions in the physics of stellar interiors.

Type
IV. Spectroscopic Patterns of Stellar Atmospheres
Information
Symposium - International Astronomical Union , Volume 132: The Impact of Veryhigh S/N Spectroscopy on Stellar Physics , 1988 , pp. 211 - 215
Copyright
Copyright © Kluwer 1988 

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