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Cool stars in NGC 2547 and pre-main-sequence lithium depletion

Jeffries, R.D.; Oliveira, J.M.; Barrado y Navascués, D.; Stauffer, J.R.

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Authors

D. Barrado y Navascués

J.R. Stauffer



Abstract

We present the results of a spectroscopic survey of X-ray selected, low-mass candidate members of the young open cluster NGC 2547. Using a combination of photometry, spectroscopic indices and radial velocities we refine our candidate list and then use our spectroscopy to study the progression of lithium depletion in low-mass pre main sequence stars. We derive lithium abundances or upper limits for all our candidate members, which have effective temperatures in the range 5000>Teff>3200K, and compare these with predictions for lithium burning and depletion provided by a number of models and also with the lithium depletion seen in younger and older stars. We find that some models can reproduce the lithium abundance pattern of NGC 2547 if the cluster has an age of ~20-35Myr, which is also indicated by fits to low-mass isochrones in the Hertzsprung-Russell diagram. But the lack of significant further lithium depletion between NGC 2547 and older clusters argues for an age of at least 50Myr, more in keeping with the lack of lithium observed in even fainter NGC 2547 candidates. We show that reconciliation of these age estimates may require additions to the physics incorporated in current generations of pre main sequence models.

Journal Article Type Article
Acceptance Date May 2, 2003
Online Publication Date Aug 21, 2003
Publication Date 2003-08
Publicly Available Date Mar 28, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 343
Issue 4
Pages 1271-1284
DOI https://doi.org/10.1046/j.1365-8711.2003.06768.x
Keywords stars, abundances, stars, late-type, open clusters and associations, individual, NGC 2547
Publisher URL http://dx.doi.org/10.1046/j.1365-8711.2003.06768.x

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