Journal
ASTROPHYSICAL JOURNAL
Volume 544, Issue 2, Pages 944-952Publisher
IOP PUBLISHING LTD
DOI: 10.1086/317258
Keywords
diffusion; stars : abundances; stars : evolution; stars : interiors; stars : mass loss; stars : rotation
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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 held F stars; such mixing is also consistent with the lithium abundances observed in M67 subgiants, although we discuss some possible complications.
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