Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23..105d&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p.105-105
Astronomy and Astrophysics
Astronomy
Scientific paper
The study of lithium content as a function of effective temperature, rotation and deepening of the convective zone is a key problem for our understanding of stellar convective mixing. Along the past ten years a number of studies have established the behavior of lithium in solar-type subgiant and giant stars (e.g.: do Nascimento, J.D.Jr., Charbonnel, C., Lèbre, A., de Laverny, P., De Medeiros, J.R. 2000, A&A 357, 931; de Laverny, do Nascimento, J.D.Jr.,Lèbre, A.,De Medeiros, J. R. 2003, A&A in press). In the present work we analyse the behavior of lithium content, as a function of different stellar parameters, in bright giant stars, namely stars of luminosity class II with masses ranging from about 3 to 6 M¤. The sample composed by 130 stars covers the spectral range from middle F to middle K. For this study, high resolution spectra were obtained with the AURELIE/ELODIE spectrographs at the Haute Provence Observatory, France, and with CES spectrograph at ESO, Chile. The preliminary results point for a gradual decline of Li abundance with temperature, following the same trend observed for subgiant and giant stars. In addition, no sign of enhanced Li content, pointing for Li-richness, is observed in this sample.
Azevedo Silva D. J.
de Laverny Patrick
de Medeiros Jose Renan
do Nascimento D.. Jr. J.
Lebre Agnès
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