paper

The Elusive Majority of Young Moving Groups. I. Young Binaries and Lithium-Rich Stars in the Solar Neighborhood

arXiv:1903.06303 · doi:10.3847/1538-4357/ab1018

Abstract

Young stars in the solar neighborhood serve as nearby probes of stellar evolution and represent promising targets to directly image self-luminous giant planets. We have carried out an all-sky search for late-type (K7M5) stars within 100 pc selected primarily on the basis of activity indicators from and . Approximately two thousand active and potentially young stars are identified, over 600 of which we have followed up with low-resolution optical spectroscopy and over 1000 with diffraction-limited imaging using Robo-AO at the Palomar 1.5-m telescope. Strong lithium is present in 58 stars, implying ages spanning 10200 Myr. Most of these lithium-rich stars are new or previously known members of young moving groups including TWA, Pic, Tuc-Hor, Carina, Columba, Argus, AB Dor, Upper Centaurus Lupus, and Lower Centaurus Crux; the rest appear to be young low-mass stars without connections to established kinematic groups. Over 200 close binaries are identified down to 0.2 the vast majority of which are new and will be valuable for dynamical mass measurements of young stars with continued orbit monitoring in the future.

arXiv commentAccepted to ApJ

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