Faint dwarfs in NGC 2547 (Jeffries+, 2005)

Details Faint dwarfs in NGC 2547 (Jeffries+, 2005) Faint dwarfs in NGC 2547 (Jeffries+, 2005)

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ycat..73580013j&link_type=abstract

VizieR On-line Data Catalog: J/MNRAS/358/13. Originally published in: 2005MNRAS.358...13J

Physics

Clusters: Open, Stars: Dwarfs, Radial Velocities, Abundances

Scientific paper

Intermediate resolution spectroscopy from the European Southern Observatory Very Large Telescope is analysed for 63 photometrically selected low-mass (0.08-0.30M{sun}) 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 Ks>14.86+/-0.12. From these results, several pre-main-sequence evolutionary models give almost model independent ages of 34-36Myr, with a precision of 10%. 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, 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 120Myr.
(1 data file).

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