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

Bowler, Brendan P. and Hinkley, Sasha and Ziegler, Carl and Baranec, Christoph and Gizis, John E. and Law, Nicholas M. and Liu, Michael C. and Shah, Viyang S. and Shkolnik, Evgenya L. and Riaz, Basmah and Riddle, Reed (2019) Elusive Majority of Young Moving Groups. I. Young Binaries and Lithium-rich Stars in the Solar Neighborhood. Astrophysical Journal, 877 (1). Art. No. 60. ISSN 1538-4357. doi:10.3847/1538-4357/ab1018.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Bowler, Brendan P.0000-0003-2649-2288
Hinkley, Sasha0000-0001-8074-2562
Ziegler, Carl0000-0002-0619-7639
Baranec, Christoph0000-0002-1917-9157
Gizis, John E.0000-0002-8916-1972
Law, Nicholas M.0000-0001-9380-6457
Liu, Michael C.0000-0003-2232-7664
Shkolnik, Evgenya L.0000-0002-7260-5821
Riaz, Basmah0000-0003-3863-4052
Riddle, Reed0000-0002-0387-370X
Additional Information:© 2019 The American Astronomical Society. Received 2018 June 25; revised 2019 February 11; accepted 2019 March 1; published 2019 May 24. It is a pleasure to thank Diane Harmer, Sean Points, and all support staff and telescope operators at KPNO and CTIO who helped make these observations possible. C.Z. is supported by a Dunlap Fellowship at the Dunlap Institute for Astronomy & Astrophysics, funded through an endowment established by the Dunlap family and the University of Toronto. V.S. was supported part from the John W. Cox Endowment for the Advanced Studies in Astronomy. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This work has made use of data from the European Space Agency (ESA) mission Gaia (, processed by the Gaia Data Processing and Analysis Consortium (DPAC; Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. The Robo-AO system was developed by collaborating partner institutions, the California Institute of Technology and the Inter-University Centre for Astronomy and Astrophysics, and with the support of the National Science Foundation under grant Nos. AST-0906060, AST-0960343, and AST-1207891; the Mt. Cuba Astronomical Foundation; and by a gift from Samuel Oschin. Ongoing science operation support of Robo-AO is provided by the California Institute of Technology and the University of Hawai'i. C.B. acknowledges support from the Alfred P. Sloan Foundation. NASA's Astrophysics Data System Bibliographic Services together with the VizieR catalog access tool and SIMBAD database operated at CDS, Strasbourg, France, were invaluable resources for this work. Based on observations made with the NASA Galaxy Evolution Explorer. GALEX is operated for NASA by the California Institute of Technology under NASA contract NAS5-98034. This research has made use of the Washington Double Star Catalog maintained at the U.S. Naval Observatory. Based in part on observations obtained at the Southern Astrophysical Research (SOAR) telescope (NOAO Prop. ID 2013B-0496, 2014A-0019, 2015A-0016; PI: B. Bowler), which is a joint project of the Ministério da Ciência, Tecnologia, Inovaçãos e Comunicaçãoes (MCTIC) do Brasil, the U.S. National Optical Astronomy Observatory (NOAO), the University of North Carolina at Chapel Hill (UNC), and Michigan State University (MSU). Based in part on observations at Kitt Peak National Observatory, National Optical Astronomy Observatory (NOAO Prop. IDs 2013B-0496, 2014A-0019, 2015A-0016; PI: B. Bowler), which is operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation. Institutional allocation for the Robo-AO observations at the P60 telescope was provided based on the prior affiliation of B.P.B. and S.H. with the California Institute of Technology. The authors are honored to be permitted to conduct astronomical research on Iolkam Du'ag (Kitt Peak), a mountain with particular significance to the Tohono O'odham. Facilities: Mayall (RC-Spec) - , SOAR (Goodman Spectrograph) - , PO:1.5 m (Robo-AO) - , UH:2.2 m (SNIFS) - .
Funding AgencyGrant Number
Dunlap Institute for Astronomy and AstrophysicsUNSPECIFIED
University of TorontoUNSPECIFIED
John W. Cox EndowmentUNSPECIFIED
Gaia Multilateral AgreementUNSPECIFIED
Mt. Cuba Astronomical FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Subject Keywords:binaries: visual – stars: low-mass
Issue or Number:1
Record Number:CaltechAUTHORS:20190524-083634936
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Official Citation:Brendan P. Bowler et al 2019 ApJ 877 60
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95775
Deposited By: Tony Diaz
Deposited On:24 May 2019 16:18
Last Modified:16 Nov 2021 17:15

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