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