Hostname: page-component-745bb68f8f-b95js Total loading time: 0 Render date: 2025-01-13T10:54:46.682Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Alecian, G.: 1982, Astron. Astrophys. 107, 61 Google Scholar
Alecian, G. and Artru, M.-C.: 1987, Astron. Astrophys., in press Google Scholar
Alecian, G., Grappin, R.: 1984, Astron. Astrophys. 140, 159 Google Scholar
Alecian, G., Vauclair, S.: 1983, Fundamentals of Cosmic Physics, 8, 369, Gordon and Breach Science Publishers Ltd. Google Scholar
Artru, M.-C.: 1986, Astron. Astrophys., 168, L5 Google Scholar
Bonsack, W.K., Wolff, S.C.: 1980, Astron. J., 85, 599 Google Scholar
Borsenberger, J., Gros, M.: 1978, Astron. Astrophys. Suppl. 31, 291 Google Scholar
Borsenberger, J., Michaud, G., Praderie, F.: 1981, Astrophys. J., 243, 533 Google Scholar
Guthrie, B.N.G.: 1984, Mon. Not R. Astr. Soc. 206, 85 Google Scholar
Heacox, W. D.: 1979, Astrophys. J. 41, 675 Google Scholar
Jamar, C., Macau-Hercot, D. and Praderie, F.: 1978, Astron. Astrophys. 63, 155 Google Scholar
Michaud, G.: 1970, Astrophys. J. 160, 641 Google Scholar
Takada-Hidai, M., Sadakane, K. and Jugaku, J.: 1986, Astrophys. J., 304, 425 CrossRefGoogle Scholar