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2000ApJ...544..944S - Astrophys. J., 544, 944-952 (2000/December-1)

WIYN open cluster study. VI. Interpretive models of light-element depletion from M67 subgiants.


Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): Diffusion - Stars: Abundances - Stars: Evolution - Stars: Interiors - Stars: Mass Loss - Stars: Rotation

Simbad objects: 6

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