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The Spotted Li abundance on the surface of the CP star HD 3980

Published online by Cambridge University Press:  02 March 2005

N.A. Drake ,
N.S. Polosukhina ,
R. de la Reza  and
M. Hack
N.A. Drake
Affiliation:
Observatório Nacional/MCT, Rua General José Cristino 77, 20921-400, Rio de Janeiro, Brazil email: drake@on.br Sobolev Astronomical Institute, St. Petersburg State University, Universitetsky pr. 28, Petrodvorets, 198504, St. Petersburg, Russia
N.S. Polosukhina
Affiliation:
Crimean Astrophysical Observatory, Nauchny, Crimea, 334413, Ukraine email: polo@crao.crimea.ua
R. de la Reza
Affiliation:
Observatório Nacional/MCT, Rua General José Cristino 77, 20921-400, Rio de Janeiro, Brazil email: drake@on.br
M. Hack
Affiliation:
Department of Astronomy, Trieste University, Via Tiepolo 11, 34131 Trieste, Italy email: hack@ts.astro.it
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Abstract

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We report the results of the spectral monitoring of the chemically peculiar (CP2) star HD 3980 in the Li I$\lambda 6708$ spectral region. High spectral resolution observations ($R=88000$) were carried out at Mount Stromlo Observatory with the 74-inch telescope and the echelle spectrograph. HD 3980 is a late type Ap SrCrEu star with strong double-wave photometric variations in the visible and in the near infrared. We estimated the effective temperature, surface gravity, mass, luminosity, and radius of this star. The monitoring of this star shows strong spectral variations, especially in the profile of Li I$\lambda 6707.8$. We studied the variations of the equivalent width and position of the Li I line as a function of the rotating phase and compared them with the magnetic field variations and light curves taken from the literature. The synchronism of the variations of the Li I line profile, light curve, and magnetic field strength can be explained in terms of the oblique magnetic rotator model. The strong variations of position and intensity of this line with the rotation phase enable us to consider this star as a new member of the intriguing group of “Li-spotted” CP stars.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Keywords

Stars: chemically peculiarstars: Li abundancestars: individual: (HD 3980)stars: fundamental parameters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS224 , July 2004 , pp. 692 - 700
Copyright
© 2004 International Astronomical Union