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Are pre-MS stars older than we thought?

Published online by Cambridge University Press:  21 October 2010

Tim Naylor  and
N.J. Mayne
Tim Naylor
Affiliation:
School of Physics, University of Exeter, EX4 4QL, UK
N.J. Mayne
Affiliation:
School of Physics, University of Exeter, EX4 4QL, UK
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Abstract

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We present a consistent age ordering for young clusters and groups determined using the contraction of stars through their pre-main-sequence phase. We compare these with ages derived from the evolution of the upper main-sequence stars, and find the upper MS ages are older by a factor 1.5 to 2. We show that increasing the binary fraction and number of equal-mass binaries amongst the O-stars compared to the rest of the MS cannot remove this discrepancy.

Keywords

methods: statisticalstars: formationopen clusters and associations: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 763
Copyright
Copyright © International Astronomical Union 2010

References

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Naylor, T. 2009, arXiv:0907.2307Google Scholar
Sana, H., Gosset, E., & Evans, C. J. 2009, arXiv:0909.0486Google Scholar