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Abundance Stratifications in the Atmospheres of Ap Stars: The Case of Gallium

Published online by Cambridge University Press:  19 July 2016

G. Alecian  and
M.-C. Artru
G. Alecian
Affiliation:
Observatoire de Paris-Meudon, F-92195 Meudon Principal Cedex, France
M.-C. Artru
Affiliation:
Observatoire de Paris-Meudon, F-92195 Meudon Principal Cedex, France

Abstract

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The abundances are usually determined assuming homogeneous concentrations for all elements in the line forming region. If diffusion driven by radiation occurs, this condition is not verified and the element stratification affects the equivalent widths as well as the line profiles. We shall illustrate these problems by a study of the gallium case. A synthetic spectrum of the Ga II resonance line λ 1414.401 Å has been computed assuming that gallium is stratified according a recent theoretical study of the diffusion of this element.

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. 235 - 238
Copyright
Copyright © Kluwer 1988 

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