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Astron. Astrophys. 317, 701-706 (1997)

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On the link between rotation and lithium depletion in subgiant stars *

J.R. De Medeiros 1, J.D. do Nascimento Jr 1 and M. Mayor 2

1 Departamento de Física, Universidade Federal do Rio Grande do Norte, Campus Universitário, 59072-970, Natal, R.N., Brasil
2 Observatoire de Genève, ch. des Maillettes 51, CH-1290 Sauverny, Suisse

Received 16 November 1995 / Accepted 22 May 1996

Abstract

We present projected rotational velocity Vsini for 65 F, G and K subgiant stars. In this work we study the link between rotation and Lithium abundance in such class of luminosity. In particular, we look for possible effects of rotational braking on the Lithium depletion. We show that a sharp decrease in Lithium abundances parallels the rotational discontinuity, located at F8IV, in all its aspects. We have found some dependence of Lithium abundance upon rotation for single subgiants, but there is no evident correlation between Lithium abundance and rotational velocity for binary subgiant stars.

Key words: stars: abundances – binaries: spectroscopic – stars: evolution – stars: late-type – stars: rotation

* Based on observations collected at the Haute-Provence Observatory, Saint-Michel, France, and at The European Southern Observatory, La Silla, Chile

Send offprint requests to: J.R. De Medeiros

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© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998
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