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Lithium and its isotopic ratio $^6{\rm Li}/^7{\rm Li}$ in the atmospheres of some sharp-lined roAp stars

Published online by Cambridge University Press:  02 March 2005

A. Shavrina ,
N. Polosukhina ,
S. Khan ,
Ya. Pavlenko ,
V. Khalack ,
G.A. Wade ,
P. Quinet ,
N. Mikhailitska ,
A. Yushchenko  and
V. Gopka
...Show all authors
A. Shavrina
Affiliation:
Main Astronomical Observatory of NASU 27 Zabolotnogo Str., 03680, Kyiv, Ukraine email: [email protected], [email protected], [email protected], [email protected]
N. Polosukhina
Affiliation:
Crimean Observatory, Ukraine email: [email protected]
S. Khan
Affiliation:
Simpheropol University, Ukraine email: [email protected]
Ya. Pavlenko
Affiliation:
Main Astronomical Observatory of NASU 27 Zabolotnogo Str., 03680, Kyiv, Ukraine email: [email protected], [email protected], [email protected], [email protected]
V. Khalack
Affiliation:
Main Astronomical Observatory of NASU 27 Zabolotnogo Str., 03680, Kyiv, Ukraine email: [email protected], [email protected], [email protected], [email protected]
G.A. Wade
Affiliation:
Physics Department, Royal Military College of Canada email: [email protected]
P. Quinet
Affiliation:
Astrophysique et Spectroscopie, Universite de Mons-Hainaut, Belgium email: [email protected]
N. Mikhailitska
Affiliation:
Main Astronomical Observatory of NASU 27 Zabolotnogo Str., 03680, Kyiv, Ukraine email: [email protected], [email protected], [email protected], [email protected]
A. Yushchenko
Affiliation:
Observatory of Odesa University, Ukraine email: [email protected], [email protected] Astrophysical Research Center of the Structure and Evolution of the Cosmos (ARCSEC), Sejong University, Seoul 143-747, Korea email: [email protected]
V. Gopka
Affiliation:
Observatory of Odesa University, Ukraine email: [email protected], [email protected]
A. Hatzes
Affiliation:
Thüringer Landersternwarte, Tautenburg, Germany email: [email protected]
D. Mkrtichian
Affiliation:
Observatory of Odesa University, Ukraine email: [email protected], [email protected] Astrophysical Research Center of the Structure and Evolution of the Cosmos (ARCSEC), Sejong University, Seoul 143-747, Korea email: [email protected]
A. Veles
Affiliation:
Main Astronomical Observatory of NASU 27 Zabolotnogo Str., 03680, Kyiv, Ukraine email: [email protected], [email protected], [email protected], [email protected]
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Abstract

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The lines of lithium at $\lambda 6708$ and $\lambda 6103$ are analyzed in high resolution spectra of some sharp-lined and slowly rotating roAp stars. Three spectral synthesis codes, STARSP, ZEEMAN2 and SYNTHM were used. New lines of the Rare Earth Elements from the DREAM database, and lines calculated on the basis of the NIST energy levels were included. Magnetic splitting and other line broadening processes were taken into account. Enhanced abundances of lithium in the atmospheres of the stars studied are obtained for both lithium lines. High estimates of $^6{\rm Li}/^7{\rm Li}$ ratio ($0.2\div0.5$) for the studied stars can be explained by Galactic Cosmic Ray (GCR) production by spallation reactions and the preservation of the original $^6{\rm Li}$ and $^7{\rm Li}$ by the strong magnetic fields.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Keywords

Stars: chemically peculiarstars: magnetic fieldsstars: individual: (HD 137947, HD 201601, HD 134214, HD 166473, HD 101065)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS224 , July 2004 , pp. 711 - 715
Copyright
© 2004 International Astronomical Union