Robin Jeffries r.d.jeffries@keele.ac.uk
The Keele–Exeter young cluster survey – I. Low-mass pre-main-sequence stars in NGC 2169
Jeffries, R.D.; Oliveira, J.M.; Naylor, Tim; Mayne, N.J.; Littlefair, S.P.
Authors
Joana Maria Oliveira j.oliveira@keele.ac.uk
Tim Naylor
N.J. Mayne
S.P. Littlefair
Abstract
We have used R_C I_C CCD photometry from the Isaac Newton telescope and intermediate resolution spectroscopy from the Gemini North telescope to identify and characterise low-mass (0.15<M/M_sun<1.3) pre-main sequence stars in the young open cluster NGC 2169. Isochrone fitting to the high- and low-mass populations yields an intrinsic distance modulus of 10.13{+0.06}{-0.09} mag and a model-dependent age of 9+/-2 Myr. Compared with the nearby, kinematically defined groups of a similar age, NGC 2169 has a large low-mass population which potentially offers a more precise statistical investigation of several aspects of star formation and early stellar evolution. By modelling the distribution of low-mass stars in the I_C versus R_C-I_C diagram we find that any age spread among cluster members has a Gaussian full width at half maximum <=2.5 Myr. A young age and small age spread (<10 Myr) are supported by the lack of significant lithium depletion in the vast majority of cluster members. There is no clear evidence for accretion or warm circumstellar dust in the low-mass members of NGC 2169, bolstering the idea that strong accretion has ceased and inner discs have dispersed in almost all low-mass stars by ages of 10 Myr.
Citation
Jeffries, R., Oliveira, J., Naylor, T., Mayne, N., & Littlefair, S. (2007). The Keele–Exeter young cluster survey – I. Low-mass pre-main-sequence stars in NGC 2169. Monthly Notices of the Royal Astronomical Society, 376(2), 580 -598. https://doi.org/10.1111/j.1365-2966.2007.11327.x
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 21, 2006 |
Online Publication Date | Apr 13, 2007 |
Publication Date | 2007-04 |
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 | 376 |
Issue | 2 |
Pages | 580 -598 |
DOI | https://doi.org/10.1111/j.1365-2966.2007.11327.x |
Keywords | stars, pre-main sequence, abundances, late-type, open clusters and associations, individual, NGC 2169 |
Publisher URL | http://dx.doi.org/10.1111/j.1365-2966.2007.11327.x |
Files
0611630v1.pdf
(2.6 Mb)
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