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Age-related observations of low mass pre-main and young main sequence stars

Published online by Cambridge University Press:  01 October 2008

Lynne A. Hillenbrand
Lynne A. Hillenbrand*
Affiliation:
California Institute of Technology, MC 105-24, Pasadena, CA 91125, (USA) email: lah@astro.caltech.edu
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Abstract

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This overview summarizes the age dating methods available for young sub-solar mass stars. Pre-main sequence age diagnostics include the Hertzsprung-Russell (HR) diagram, spectroscopic surface gravity indicators, and lithium depletion; asteroseismology is also showing recent promise. Near and beyond the zero-age main sequence, rotation period or vsini and activity (coronal and chromospheric) diagnostics along with lithium depletion serve as age proxies. Other authors in this volume present more detail in each of the aforementioned areas. Herein, I focus on pre-main sequence HR diagrams and address the questions: Do empirical young cluster isochrones match theoretical isochrones? Do isochrones predict stellar ages consistent with those derived via other independent techniques? Do the observed apparent luminosity spreads at constant effective temperature correspond to true age spreads? While definitive answers to these questions are not provided, some methods of progression are outlined.

Keywords

stars: pre–main-sequence(stars:) Hertzsprung-Russell diagram (Galaxy:) open clusters and associations: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S258: The Ages of Stars , October 2008 , pp. 81 - 94
Copyright
Copyright © International Astronomical Union 2009

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