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The lithium depletion boundary in NGC 2547 as a test of pre-main-sequence evolutionary models

Jeffries, Robin D.; Oliveira, Joanna M.

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Abstract

Intermediate resolution spectroscopy from the ESO Very Large Telescope is analysed for 63 photometrically selected low-mass (0.08-0.30 Msun) candidates of the open cluster NGC 2547. We have confirmed membership for most of these stars using radial velocities, and found that lithium remains undepleted for cluster stars with I>17.54+/-0.14 and K_{s}>14.86+/-0.12. From these results, several pre-main-sequence evolutionary models give almost model independent ages of 34-36 Myr, with a precision of 10 per cent. These ages are only slightly larger than the ages of 25-35 (+/-5) Myr obtained using the same models to fit isochrones to higher mass stars descending towards the zero age main sequence (ZAMS), both in empirically calibrated and theoretical colour-magnitude diagrams. This agreement between age determinations in different mass ranges is an excellent test of the current generation of low-mass pre-main sequence stellar models and lends confidence to ages determined with either method between 30 and 120 Myr.

Journal Article Type Article
Acceptance Date Nov 3, 2004
Online Publication Date Mar 21, 2005
Publication Date 2005-03
Publicly Available Date Mar 29, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 358
Issue 1
Pages 13 -29
DOI https://doi.org/10.1111/j.1365-2966.2005.08820.x
Keywords stars, abundancies, late-type stars
Publisher URL http://dx.doi.org/10.1111/j.1365-2966.2005.08820.x

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