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Spectroscopic analysis of chemically peculiar stars: abundance determination of lithium and some rare earth elements

Published online by Cambridge University Press:  23 December 2005

N.A. Drake ,
N. Nesvacil ,
S. Hubrig ,
O. Kochukhov ,
R. de la Reza ,
N.S. Polosukhina  and
J.F. Gonzalez
N.A. Drake
Affiliation:
Observatório Nacional/MCT, Rua General Josè Cristino, 77, Rio de Janeiro, Brazil email: [email protected], [email protected]
N. Nesvacil
Affiliation:
European Southern Observatory, Santiago, Chile email: [email protected], [email protected]
S. Hubrig
Affiliation:
European Southern Observatory, Santiago, Chile email: [email protected], [email protected]
O. Kochukhov
Affiliation:
Department of Astronomy and Space Physics, Uppsala University, Sweden email: [email protected]
R. de la Reza
Affiliation:
Observatório Nacional/MCT, Rua General Josè Cristino, 77, Rio de Janeiro, Brazil email: [email protected], [email protected]
N.S. Polosukhina
Affiliation:
Crimean Astrophysical Observatory, Ukraine email: [email protected]
J.F. Gonzalez
Affiliation:
Complejo Astronómico El Leoncito, Argentina email: [email protected]
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Abstract

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We present the results of a study of some selected spectral regions, including those around the LiI lines at 6708 Å and 6104 Å in the magnetic chemically peculiar star HD 3980 and in a few other Ap stars with different effective temperatures and different strengths of the magnetic field. High resolution spectroscopic observations were carried out with the Coudé echelle spectrograph at the 74-inch telescope of the Mount Stromlo Observatory ($R=88000$) and with the VLT UV-Visual Echelle Spectrograph UVES at UT2 at ESO ($R=110000$). Using spectral synthesis we determined abundances of Li, Ce, Pr, Nd and some other rare earth elements and showed that the spectral feature at 6708 Å in the spectrum of HD 3980 is due to the Li I doublet with only a minor contribution of the Ce II line at 6708.099 Å.

Keywords

Stars: abundancesstars: chemically peculiarstars: individual (HD 3980)stars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 89 - 90
Copyright
© 2005 International Astronomical Union