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Astron. Astrophys. 363, 239-243 (2000)

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Rotation and lithium in single giant stars * **

J.R. De Medeiros, J.D. do Nascimento Jr., S. Sankarankutty, J.M. Costa and M.R.G. Maia

Departamento de Física, Universidade Federal do Rio Grande do Norte, 59072-970 Natal, R.N., Brazil

Received 24 July 2000 / Accepted 22 August 2000

Abstract

In the present work, we study the link between rotation and lithium abundance in giant stars of luminosity class III, on the basis of a large sample of 309 single stars of spectral type F, G and K. We have found a trend for a link between the discontinuity in rotation at the spectral type G0III and the behavior of lithium abundances around the same spectral type. The present work also shows that giant stars presenting the highest lithium contents, typically stars earlier than G0III, are those with the highest rotation rates, pointing for a dependence of lithium content on rotation, as observed for other luminosity classes. Giant stars later than G0III present, as a rule, the lowest rotation rates and lithium contents. A large spread of about five magnitudes in lithium abundance is observed for the slow rotators. Finally, single giant stars with masses [FORMULA] show a clearest trend for a correlation between rotational velocity and lithium abundance.

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

* Based on observations collected at the Observatoire de Haute - Provence (France) and at the European Southern Observatory, La Silla (Chile).
** Table 2 is only available electronically here in the On-Line publication

Send offprint requests to: J.R. De Medeiros (renan@dfte.ufrn.br)

This article contains no SIMBAD objects.

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© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000
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