Robin Jeffries r.d.jeffries@keele.ac.uk
The lithium depletion boundary in NGC 2547 as a test of pre-main-sequence evolutionary models
Jeffries, Robin D.; Oliveira, Joanna M.
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.
Citation
Jeffries, R. D., & Oliveira, J. M. (2005). The lithium depletion boundary in NGC 2547 as a test of pre-main-sequence evolutionary models. Monthly Notices of the Royal Astronomical Society, 358(1), 13 -29. https://doi.org/10.1111/j.1365-2966.2005.08820.x
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 3, 2004 |
Online Publication Date | Mar 21, 2005 |
Publication Date | 2005-03 |
Publicly Available Date | May 26, 2023 |
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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