Journal
ASTROPHYSICAL JOURNAL
Volume 659, Issue 1, Pages L41-L44Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/516733
Keywords
open clusters and associations : individual (Orion Nebula cluster); stars : abundances; stars : formation; stars : pre-main-sequence
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We measured lithium in a sample of low-mass stars (similar to 0.1-0.3M(circle dot))of the Orion Nebula cluster. We find evidence for significant Li depletion in four high-probability members, corresponding to nuclear ages between similar to 15 and 30 Myr. In two cases, there is excellent agreement between the mass and age based on models of Li burning and those derived from the H-R diagram, reinforcing our early findings. For the two other stars, the nuclear age is significantly larger than the isochronal one. Several Li-depleted stars display accretion activity, veiling, and emission lines. We discuss empirical evidence in favor of the old nuclear age and the implications on the star formation history of the Orion cluster.
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