Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-08-05
Astron.Astrophys. 425 (2004) 1013-1027
Astronomy and Astrophysics
Astrophysics
16 pages, 13 figures, accepted for publication in Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20040510
We present a study of beryllium (Be) abundances in a large sample of field solar-type dwarfs and sub-giants spanning a large range of effective temperatures. The analysis shows that Be is severely depleted for F stars, as expected by the light-element depletion models. However, we also show that Beryllium abundances decrease with decreasing temperature for stars cooler than $\sim$6000 K, a result that cannot be explained by current theoretical models including rotational mixing, but that is, at least in part, expected from the models that take into account internal wave physics. In particular, the light element abundances of the coolest and youngest stars in our sample suggest that Be, as well as lithium (Li), has already been burned early during their evolution. Furthermore, we find strong evidence for the existence of a Be-gap for solar-temperature stars. The analysis of Li and Be abundances in the sub-giants of our sample also shows the presence of one case that has still detectable amounts of Li, while Be is severely depleted. Finally, we compare the derived Be abundances with Li abundances derived using the same set of stellar parameters. This gives us the possibility to explore the temperatures for which the onset of Li and Be depletion occurs.
García López Ramón J.
Israelian Garik
Randich Sofia
Rebolo Rafael
Santos Nuno Cardoso
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