Activity in a Sample of Nearby Solar Analogs

Christopher J. Corbally (Vatican Observatory)

A NASA/JPL NStars project conducted through Appalachian State University has obtained medium-resolution spectroscopic data for 3600 stars within 40 pc of the Sun and spectral types earlier than M0. It has been 1) providing new, precise classifications of these stars, 2) deriving their basic physical parameters including effective temperature, surface gravity and overall metallicity, and 3) providing the chromospheric activity of these stars. We shall outline the continuation of this project to which recent improvements have been made. These are both to the estimation of chromospheric activity, now closer to the Mount Wilson system, and to the derivation of stellar parameters through use of Kurucz's newer, Atlas12 atmospheric models. For a limited, improved sample, activity and evolutionary age are compared.

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