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

Brendan P. Bowler, Sasha Hinkley, Carl Ziegler, Christoph Baranec, John E. Gizis, Nicholas M. Law, Michael C. Liu, Viyang S. Shah, Evgenya Shkolnik, Basmah Riaz, Reed Riddle

Research output: Contribution to journalArticle

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 (≈K7-M5) stars within 100 pc selected primarily on the basis of activity indicators from the Galaxy Evolution Explorer and ROSAT. Approximately 2000 active and potentially young stars are identified, of which we have followed up over 600 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 ≈10-200 Myr. Most of these lithium-rich stars are new or previously known members of young moving groups including TWA, β 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.

Original languageEnglish (US)
Article number60
JournalAstrophysical Journal
Volume877
Issue number1
DOIs
StatePublished - May 20 2019

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solar neighborhood
lithium
stars
diffraction
stellar evolution
planet
kinematics
spectroscopy
probe
young
sky
planets
monitoring
telescopes
galaxies
orbits
probes

Keywords

  • binaries: visual
  • stars: low-mass

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Bowler, B. P., Hinkley, S., Ziegler, C., Baranec, C., Gizis, J. E., Law, N. M., ... Riddle, R. (2019). The Elusive Majority of Young Moving Groups. I. Young Binaries and Lithium-rich Stars in the Solar Neighborhood. Astrophysical Journal, 877(1), [60]. https://doi.org/10.3847/1538-4357/ab1018

The Elusive Majority of Young Moving Groups. I. Young Binaries and Lithium-rich Stars in the Solar Neighborhood. / Bowler, Brendan P.; Hinkley, Sasha; Ziegler, Carl; Baranec, Christoph; Gizis, John E.; Law, Nicholas M.; Liu, Michael C.; Shah, Viyang S.; Shkolnik, Evgenya; Riaz, Basmah; Riddle, Reed.

In: Astrophysical Journal, Vol. 877, No. 1, 60, 20.05.2019.

Research output: Contribution to journalArticle

Bowler, BP, Hinkley, S, Ziegler, C, Baranec, C, Gizis, JE, Law, NM, Liu, MC, Shah, VS, Shkolnik, E, Riaz, B & Riddle, R 2019, 'The Elusive Majority of Young Moving Groups. I. Young Binaries and Lithium-rich Stars in the Solar Neighborhood', Astrophysical Journal, vol. 877, no. 1, 60. https://doi.org/10.3847/1538-4357/ab1018
Bowler, Brendan P. ; Hinkley, Sasha ; Ziegler, Carl ; Baranec, Christoph ; Gizis, John E. ; Law, Nicholas M. ; Liu, Michael C. ; Shah, Viyang S. ; Shkolnik, Evgenya ; Riaz, Basmah ; Riddle, Reed. / The Elusive Majority of Young Moving Groups. I. Young Binaries and Lithium-rich Stars in the Solar Neighborhood. In: Astrophysical Journal. 2019 ; Vol. 877, No. 1.
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