Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...544..944s&link_type=abstract
The Astrophysical Journal, Volume 544, Issue 2, pp. 944-952.
Astronomy and Astrophysics
Astronomy
14
Diffusion, Stars: Abundances, Stars: Evolution, Stars: Interiors, Stars: Mass Loss, Stars: Rotation
Scientific paper
We present evolutionary models of subgiant stars in M67 that follow the surface abundances of lithium and beryllium. These models include a number of physical processes that have been proposed as explanations for the main-sequence depletion of lithium in the Hyades. We use the observed lithium abundance as a function of temperature in M67 subgiants and the correlation between lithium and beryllium depletion to distinguish between these models. We find that constant main-sequence mass loss and diffusion are strongly ruled out as viable mechanisms for light-element depletion in main-sequence stars. Rotationally induced mixing is strongly supported by the lithium- and beryllium-depletion correlation observed in Population I field F stars; such mixing is also consistent with the lithium abundances observed in M67 subgiants, although we discuss some possible complications.
Deliyannis Constantine P.
Sills Alison
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