The GALAH Survey: Lithium-strong KM dwarfs

Forskningsoutput: TidskriftsbidragÖversiktsartikel

Standard

The GALAH Survey : Lithium-strong KM dwarfs. / GALAH Collaboration; Zerjal, M.; Ireland, M. J.; Nordlander, T.; Lin, J.; Buder, S.; Casagrande, L.; Åotar, K.; De Silva, G.; Horner, J.; Martell, S.; Traven, G.; Zwitter, T.

I: Monthly Notices of the Royal Astronomical Society, Vol. 484, Nr. 4, 2019, s. 4591-4600.

Forskningsoutput: TidskriftsbidragÖversiktsartikel

Harvard

GALAH Collaboration, Zerjal, M, Ireland, MJ, Nordlander, T, Lin, J, Buder, S, Casagrande, L, Åotar, K, De Silva, G, Horner, J, Martell, S, Traven, G & Zwitter, T 2019, 'The GALAH Survey: Lithium-strong KM dwarfs', Monthly Notices of the Royal Astronomical Society, vol. 484, nr. 4, s. 4591-4600. https://doi.org/10.1093/mnras/stz296

APA

GALAH Collaboration, Zerjal, M., Ireland, M. J., Nordlander, T., Lin, J., Buder, S., ... Zwitter, T. (2019). The GALAH Survey: Lithium-strong KM dwarfs. Monthly Notices of the Royal Astronomical Society, 484(4), 4591-4600. https://doi.org/10.1093/mnras/stz296

CBE

GALAH Collaboration, Zerjal M, Ireland MJ, Nordlander T, Lin J, Buder S, Casagrande L, Åotar K, De Silva G, Horner J, Martell S, Traven G, Zwitter T. 2019. The GALAH Survey: Lithium-strong KM dwarfs. Monthly Notices of the Royal Astronomical Society. 484(4):4591-4600. https://doi.org/10.1093/mnras/stz296

MLA

Vancouver

GALAH Collaboration, Zerjal M, Ireland MJ, Nordlander T, Lin J, Buder S et al. The GALAH Survey: Lithium-strong KM dwarfs. Monthly Notices of the Royal Astronomical Society. 2019;484(4):4591-4600. https://doi.org/10.1093/mnras/stz296

Author

GALAH Collaboration ; Zerjal, M. ; Ireland, M. J. ; Nordlander, T. ; Lin, J. ; Buder, S. ; Casagrande, L. ; Åotar, K. ; De Silva, G. ; Horner, J. ; Martell, S. ; Traven, G. ; Zwitter, T. / The GALAH Survey : Lithium-strong KM dwarfs. I: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 484, Nr. 4. s. 4591-4600.

RIS

TY - JOUR

T1 - The GALAH Survey

T2 - Monthly Notices of the Royal Astronomical Society

AU - GALAH Collaboration

AU - Zerjal, M.

AU - Ireland, M. J.

AU - Nordlander, T.

AU - Lin, J.

AU - Buder, S.

AU - Casagrande, L.

AU - Åotar, K.

AU - De Silva, G.

AU - Horner, J.

AU - Martell, S.

AU - Traven, G.

AU - Zwitter, T.

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

KW - stars: abundances

KW - stars: late-type

KW - stars: pre-main-sequence

U2 - 10.1093/mnras/stz296

DO - 10.1093/mnras/stz296

M3 - Review article

VL - 484

SP - 4591

EP - 4600

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 1365-2966

IS - 4

ER -