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Age determinations of metal-poor field stars

Published online by Cambridge University Press:  23 December 2005

A. Weiss ,
M. Salaris  and
D. Rohr
A. Weiss
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85276 Garching, Germany email: [email protected]
M. Salaris
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85276 Garching, Germany email: [email protected] Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead, CH41 1LD, UK; email: [email protected]
D. Rohr
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85276 Garching, Germany email: [email protected]
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Abstract

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To determine ages of individual (field) stars, composition, mass and distance should be known accurately, which is usually not the case. An alternative way is to use turn-off colours of field star populations. This method led in the past to ages significantly higher than those of globular clusters of the same metallicity. We show that colour-based relative ages between the field and cluster population indicate that they have similar if not equal ages. First steps using large samples of stars from SDSS are presented.

Keywords

Stars: Population IIstars: subdwarfsstars: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 279 - 280
Copyright
© 2005 International Astronomical Union