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Direct evidence for stratification in A/B stellar atmospheres

Published online by Cambridge University Press:  13 January 2006

G. Alecian ,
O. Richard ,
S. Vauclair  and
T. Ryabchikova
T. Ryabchikova*
Affiliation:
Institute of Astronomy Russian Academy of Sciences, Moscow, Russia Institute of Astronomy Vienna University, Vienna, Austria
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Abstract

Abnormal line profiles and line intensities observed in Ap stars, and their deviations from thoseexpected in homogeneous atmosphere provide a strong evidence for an existance of abundancestratification. For a sample of Ap stars in the effective temperature range 7000–9500 K abundancedistributions of Mg, Si, Ca, Cr, Fe are derived from line profiles, and they are compared with thediffusion calculations. A special attention is paid to Ca distribution for which we found an evidence forthe differential stratification of Ca isotopes. Temperature and magnetic field effects on theobserved abundance distributions are discussed.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 17: Element Stratification in Stars: 40 Years of Atomic Diffusion , 2005 , pp. 253 - 262
Copyright
© EAS, EDP Sciences, 2005

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