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Pleiades or Not? Resolving the Status of the Lithium-rich M Dwarfs HHJ 339 and HHJ 430

Stauffer, John and Barrado, David and David, Trevor and Rebull, Luisa M. and Hillenbrand, Lynne A. and Mamajek, Eric E. and Oppenheimer, Rebecca and Aigrain, Suzanne and Bouy, Herve and Lillo-Box, Jorge (2020) Pleiades or Not? Resolving the Status of the Lithium-rich M Dwarfs HHJ 339 and HHJ 430. Astronomical Journal, 160 (1). Art. No. 30. ISSN 1538-3881. https://resolver.caltech.edu/CaltechAUTHORS:20200624-073748318

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Abstract

Oppenheimer et al. discovered two M5 dwarfs in the Pleiades with nearly primordial lithium. These stars are not low enough in mass to represent the leading edge of the lithium depletion boundary at Pleiades age (~125 Myr). A possible explanation for the enhanced lithium in these stars is that they are actually not members of the Pleiades but instead are members of a younger moving group seen in projection toward the Pleiades. We have used data from Gaia DR2 to confirm that these two stars, HHJ 339 and HHJ 430, are indeed not members of the Pleiades. Based on their space motions, parallaxes, and positions in a Gaia-based color–magnitude diagram, it is probable that these two stars are about 40 parsecs foreground to the Pleiades and have ages of ~25 Myr. Kinematically they are best matched to the 32 Ori moving group.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-3881/ab93c9DOIArticle
https://arxiv.org/abs/2005.07726arXivDiscussion Paper
ORCID:
AuthorORCID
Stauffer, John0000-0003-3595-7382
David, Trevor0000-0001-6534-6246
Rebull, Luisa M.0000-0001-6381-515X
Mamajek, Eric E.0000-0003-2008-1488
Oppenheimer, Rebecca0000-0001-7130-7681
Aigrain, Suzanne0000-0003-1453-0574
Bouy, Herve0000-0002-7084-487X
Additional Information:© 2020 The American Astronomical Society. Received 2020 April 10; revised 2020 May 6; accepted 2020 May 14; published 2020 June 18. We thank all those who helped build and operate the Gaia satellite and those who worked hard to analyze the data and produce the astrometric and photometric catalogs that are now available. This paper could not have been written without their labor. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). Support for MAST for non-Hubble Space Telescope data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts. This paper includes data collected by the Kepler mission. Funding for the Kepler mission is provided by the NASA Science Mission directorate. This research has made use of the NASA/IPAC Infrared Science Archive (IRSA), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of data products from the Two Micron All-Sky Survey (2MASS), which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center, funded by the National Aeronautics and Space Administration and the National Science Foundation. The 2MASS data are served by the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of NASA's Astrophysics Data System (ADS) Abstract Service, and of the SIMBAD database, operated at CDS, Strasbourg, France. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. D.B. and J.L.B. have been funded by the Spanish State Research Agency (AEI) Projects No. ESP2017-87676-C5-1-R and No. MDM-2017-0737 Unidad de Excelencia "María de Maeztu"—Centro de Astrobiología (INTA-CSIC). Facilities: Exoplanet Archive - , IRSA - , 2MASS. -
Group:Astronomy Department, Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASANNX09AF08G
NASA/JPL/CaltechUNSPECIFIED
Ministerio de Ciencia e Innovación (MCINN)ESP2017-87676-C5-1-R
Ministerio de Ciencia e Innovación (MCINN)MDM-2017-0737
Subject Keywords:Moving clusters ; Star clusters ; Open star clusters
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Moving clusters (1076); Star clusters (1567); Open star clusters (1160)
Record Number:CaltechAUTHORS:20200624-073748318
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200624-073748318
Official Citation:John Stauffer et al 2020 AJ 160 30
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103979
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Jun 2020 14:48
Last Modified:24 Jun 2020 14:48

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