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Rotational mixing and Lithium depletion

Published online by Cambridge University Press:  23 April 2010

M. H. Pinsonneault
M. H. Pinsonneault*
Affiliation:
Ohio State University, Dept. of Astronomy 140 W. 18th Ave. Columbus, OH 43210USA email: [email protected]
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Abstract

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I review basic observational features in Population I stars which strongly implicate rotation as a mixing agent; these include dispersion at fixed temperature in coeval populations and main sequence lithium depletion for a range of masses at a rate which decays with time. New developments related to the possible suppression of mixing at late ages, close binary mergers and their lithium signature, and an alternate origin for dispersion in young cool stars tied to radius anomalies observed in active young stars are discussed. I highlight uncertainties in models of Population II lithium depletion and dispersion related to the treatment of angular momentum loss. Finally, the origins of rotation are tied to conditions in the pre-main sequence, and there is thus some evidence that environment and planet formation could impact stellar rotational properties. This may be related to recent observational evidence for cluster to cluster variations in lithium depletion and a connection between the presence of planets and stellar lithium depletion.

Keywords

Hydrodynamics – stars: abundancesrotationspots
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 375 - 380
Copyright
Copyright © International Astronomical Union 2010

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