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Astron. Astrophys. 345, 936-942 (1999)


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Lithium and rotation on the subgiant branch

I. Observations and spectral analysis *

A. Lèbre 1, P. deLaverny 1, J.R. deMedeiros 2, C. Charbonnel 3 and L. daSilva 4

1 GRAAL, UPRES-A 5024 CNRS, CC 072, Université Montpellier II, F-34095 Montpellier Cedex, France
2 Departamento de Física, Universidade Federal do Rio Grande do Norte, 59072-970 Natal, R.N., Brazil
3 Laboratoire d'Astrophysique de Toulouse, UMR 5572 CNRS, 16 Avenue E. Belin, F-31000 Toulouse, France
4 CNPq-Observatório Nacional, General Bruce 586, 20921-400 Rio do Janeiro, Brazil

Received 13 May 1998 / Accepted 5 March 1999

Abstract

We have obtained new high resolution spectroscopic observations of the lithium line at 6707.81 Å and derived lithium abundances (ALi ) by spectral synthesis for a sample of about 120 F-, G- and K-type Population I subgiant stars. For each of these stars, high precision rotational velocity obtained with the CORAVEL spectrometer is available. We present the behavior of the lithium abundance as a function of effective temperature, which shows a sort of discontinuity around 5600 K, somewhat later than the well known rotational discontinuity.

Key words: line: profiles – stars: abundances – stars: rotation

* based on observations collected at the Observatoire de Haute-Provence (France) and at the European Southern Observatory, La Silla (Chile).

Present address: Observatoire de la Côte d'Azur, Dpt. Fresnel, B.P. 4229, 06304 Nice Cedex 4, France

Send offprint requests to: A. Lèbre (lebre@graal.univ-montp2.fr)

© European Southern Observatory (ESO) 1999

Online publication: April 28, 1999

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