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New results of the spectral observations of CP stars

Published online by Cambridge University Press:  23 April 2010

N. S. Polosukhina
Affiliation:
Crimean Astrophysical Observatory, Nauchnyi, Crimea, Ukraine – email: polo@crao.crimea.ua
A. V. Shavrina
Affiliation:
Main Astronomical Observatory of NAS of Ukraine, Kyiv, Ukraine
N. A. Drake
Affiliation:
Sobolev Astronomical Institute, St. Petersburg State University, Russia
D. O. Kudryavtsev
Affiliation:
Special Astrophysical Observatory, Russian Academy of Sciences, Russia
M. A. Smirnova
Affiliation:
Crimean Astrophysical Observatory, Nauchnyi, Crimea, Ukraine – email: polo@crao.crimea.ua
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Abstract

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The lithium problem in Ap-CP stars has been, for a long time, a subject of debate. Individual characteristics of CP stars, such as high abundance of the rare-earth elements presence of magnetic fields, complicate structure of the surface distribution of chemical elements, rapid oscillations of some CP-stars, make the detection of the lithium lines and the determination of the lithium abundance, a difficult task. During the International Meeting in Slovakia in 1996, the lithium problem in Ap-CP stars was discussed. The results of the Li study carried out in CrAO Polosukhina (1973–1976), the works of Hack & Faraggiana (1963), Wallerstein & Hack (1964), Faraggiana et al. (1992–1996) formed the basis of the International project ‘Lithium in the cool CP-stars with magnetic fields’. The main goal of the project was, using systematical observations of Ap-CP stars with phase rotation in the spectral regions of the resonance doublet Li I 6708 Å and subordinate 6104 Å lithium lines with different telescopes, to create a database, which will permit to explain the physical origin of anomalous Li abundance in the atmospheres of these stars.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010

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