Are pre-MS stars older than we thought?

Details Are pre-MS stars older than we thought? Are pre-MS stars older than we thought?

2009-09-29

arxiv.org/abs/0909.5320v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

1 page. Special Session 7, IAU XXVII General Assembly

Scientific paper

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.

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