Are pre-MS stars older than we thought?
Naylor, T; Mayne, NJ
Date: 21 October 2010
Journal
Vol. 5 issue H15, p. 763
Publisher
Cambridge University Press (CUP) for International Astronomical Union (IAU)
Publisher DOI
Abstract
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 ...
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.
Physics and Astronomy
Faculty of Environment, Science and Economy
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