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Session 78 - Stars - Young and Old, Large and Small.
Display session, Wednesday, January 15
Metropolitan Ballroom,

[78.06] New Models for Angular Momentum Evolution : Implications for the Primordial Lithium Abundance

M. H. Pinsonneault, V. K. Narayanan, A. Krishnamurthi (Ohio State U.)

We have constructed theoretical models which reproduce the angular momentum evolution of low mass stars. In this poster we examine lithium depletion in these models. We use the distribution of rotation rates in young clusters to set the distribution of initial conditions. Lithium depletion in turn is influenced by the initial angular momentum and calibrated on the solar lithium depletion for some assumed solar initial angular momentum. We then examine the distribution of lithium depletion rates that are predicted and their sensitivity to the input physics and solar calibration. The initial condition assigned to the Sun is found to be the most significant uncertainty. A range of possible primordial Li7 abundances is then inferred, which is intermediate between that for standard models and previous studies of rotational mixing in halo stars. We also discuss observational tests which can be used to reduce the uncertainty in the primordial lithium abundance.

Program listing for Wednesday