Is an engulfment event at the origin of the Li-rich giants?

• Type: Article in International Conference Proceedings Book
• Date: 2006

Authors

Melo, CHF (Author) Other; de Laverny, P (Author) Other; N.C. Santos (Author) Other; Israelian, G (Author) Other; Randich, S (Author) Other; do Nascimento, JDJ (Author) Other; De Medeiros, JR (Author) Other

Conference proceedings International

Title: Chemical Abundances and Mixing in Stars in the Milky Way and Its Satellites

Pages: 208-210

ESO-Arcetri Workshop on Chemical Abundances and Mixing in Stars in the Milky Way and its Satellites

Castiglione della Pescaia, ITALY, SEP 13-17, 2004

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Other information

Authenticus ID: P-007-GBD

DOI: 10.1007/978-3-540-34136-9_72

Abstract (EN): We have derived beryllium abundances for all Li-rich giant stars known in the literature and visible from the southern hemisphere and 10 other Li-normal giants, aimed to investigate the origin of the Lithium in the Li-rich giants. In particular, we test the predictions of the engulfment scenario proposed by Siess & Livio (1999) where the engulfment of a brown dwarf or one or more giant planets would lead to a simultaneous enrichment of Li-7 and Be-9. We show that regardless their nature, none of the stars observed in this work was found to have beryllium. Using simple dilution arguments we show that the engulfment of an external object as the sole source of Li enrichment is ruled out by the the Li and Be abundance data. The present results favor the idea that Li has been produced in the interior of the stars and brought up to the surface by a Cameron-Fowler mechanism.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 3