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The GALAH Survey : ...
The GALAH Survey : Lithium-strong KM dwarfs
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- Zerjal, M. (author)
- Australian National University
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- Ireland, M. J. (author)
- Australian National University
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- Nordlander, T. (author)
- Australian National University
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- Lin, J. (author)
- Australian National University
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- Buder, S. (author)
- Heidelberg University,Max Planck Institute for Astronomy
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- Casagrande, L. (author)
- Australian National University
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- Åotar, K. (author)
- University of Ljubljana
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- De Silva, G. (author)
- Australian Astronomical Observatory,University of Sydney
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- Horner, J. (author)
- University of Southern Queensland
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- Martell, S. (author)
- University of New South Wales
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- Traven, G. (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Zwitter, T. (author)
- University of Ljubljana
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(creator_code:org_t)
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- 2019-01-30
- 2019
- English 10 s.
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In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 484:4, s. 4591-4600
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http://dx.doi.org/10...
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http://eprints.usq.e...
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Abstract
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- Identifying and characterizing young stars in the Solar neighbourhood is essential to find and describe planets in the early stages of their evolution. This work seeks to identify nearby young stars showing a lithium 6708 Å absorption line in the GALAH survey. A robust, data-driven approach is used to search for corresponding templates in the pool of 434 215 measured dwarf spectra in the survey. It enables a model-free search for best-matching spectral templates for all stars, including M dwarfs with strong molecular absorption bands. 3147 stars have been found to have measurable lithium: 1408 G and 892 K0-K5 dwarfs (EW(Li) > 0.1 Å), 335 K5-K9 (>0.07 Å) and 512 M0-M4 dwarfs (>0.05 Å). Stars with such lithium features are used to investigate the possibility of searching for young stars above the main sequence based merely on their parallaxes and broad-band photometry. The selection of young stars above the main sequence is highly effective for M dwarfs, moderately effective for K dwarfs and ineffective for G dwarfs. Using a combination of the lithium information and the complete 6D kinematics from Gaia and GALAH, 305 new candidate moving group members have been found, 123 of which belong to the Scorpius-Centaurus association, 36 to the Pleiades and 25 to the Hyades clusters.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- stars: abundances
- stars: late-type
- stars: pre-main-sequence
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- for (subject category)
- ref (subject category)
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- By the author/editor
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Zerjal, M.
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Ireland, M. J.
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Nordlander, T.
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Lin, J.
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Buder, S.
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Casagrande, L.
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show more...
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Åotar, K.
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De Silva, G.
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Horner, J.
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Martell, S.
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Traven, G.
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Zwitter, T.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Monthly Notices ...
- By the university
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Lund University