Lithium Abundances in Orion IC PMS Stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

I present (7) Li abundances for 23 intermediate-mass (1.5=}5500 K) temperatures. Such a spread can not be explained by either standard models or the new rotational Yale models. Because the stars with the smallest rotational velocities also have the lowest Li abundances, I speculate that the explanation for this spread is that rotational braking, leading to mixing and subsequent (7) Li depletion, has occurred within 10(7) yr for some of the stars.

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