On Ca II Emission as an Indicator of the Age of Young Stars

Song, Inseok; Zuckerman, B; Bessell, Michael

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On Ca II Emission as an Indicator of the Age of Young Stars

Date

2004

Authors

Song, Inseok

Zuckerman, B

Bessell, Michael

Publisher

IOP Publishing

Abstract

Chromospheric emission in the Ca II H and K lines has often been used as an age diagnostic for solar mass stars. For 20 such stars with ages less than a few hundred megayears, we compare Ca II ages derived by Wright et al. with ages we derive based on a combination of lithium abundance, X-ray activity, and Galactic space motion. Typically, the Ca II ages are noticeably older than the lithium/X-ray ages, suggesting that a recalibration of the Ca II ages may be necessary.