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The Effects of Magnetic Activity on Lithium-Inferred Ages of Stars

Published online by Cambridge University Press:  07 August 2014

Aaron J. Juarez ,
Phillip A. Cargile ,
David J. James  and
Keivan G. Stassun
Aaron J. Juarez
Affiliation:
Dept. of Physics, Fisk University, Nashville, TN 37208, USA Dept. of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA email: a.juarez@vanderbilt.edu
Phillip A. Cargile
Affiliation:
Dept. of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA email: a.juarez@vanderbilt.edu
David J. James
Affiliation:
Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
Keivan G. Stassun
Affiliation:
Dept. of Physics, Fisk University, Nashville, TN 37208, USA Dept. of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA email: a.juarez@vanderbilt.edu
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Abstract

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In this project, we investigate the effects of magnetic activity on the Lithium Depletion Boundary (LDB) to recalibrate the measured ages for star clusters, using the open cluster Blanco 1 as a pilot study. We apply the LDB technique on low-mass Pre-Main-Sequence (PMS) stars to derive an accurate age for Blanco 1, and we consider the effect of magnetic activity on this inferred age. Although observations have shown that magnetic activity directly affects stellar radius and temperature, most PMS models do not include the effects of magnetic activity on stellar properties. Since the lithium abundance of a star depends on its radius and temperature, we expect that LDB ages are affected by magnetic activity. After empirically accounting for the effects of magnetic activity, we find the age of Blanco 1 to be ~100 Myr, which is ~30 Myr younger than the standard LDB age of ~130 Myr.

Keywords

Magnetic activityfundamental parameterspre-main sequence starsopen clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S302: Magnetic Fields throughout Stellar Evolution , August 2013 , pp. 100 - 101
Copyright
Copyright © International Astronomical Union 2014 

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