A spectroscopically confirmed Gaia-selected sample of 318 new young stars within ∼200 pc
Article
Article Title | A spectroscopically confirmed Gaia-selected sample of 318 new young stars within ∼200 pc |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Zerjal, Marusa (Author), Rains, Adam D. (Author), Ireland, Michael J., Zhou, George (Author), Kammerer, Jens (Author), Wallace, Alex (Author), Orenstein, Brendan J. (Author), Nordlander, Thomas (Author), Abbot, Harrison (Author) and Chang, Seo-Won (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 503 (1), pp. 938-952 |
Number of Pages | 15 |
Year | 2021 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stab513 |
Web Address (URL) | https://academic.oup.com/mnras/article/503/1/938/6152287 |
Abstract | In the Gaia era, the majority of stars in the Solar neighbourhood have parallaxes and proper motions precisely determined while spectroscopic age indicators are still missing for a large fraction of low-mass young stars. In this work, we select 756 overluminous late K and early M young star candidates in the southern sky and observe them over 64 nights with the ANU 2.3-m Telescope at Siding Spring Observatory using the Echelle (R = 24 000) and Wide Field spectrographs (WiFeS, R = 3000-7000). Our selection is kinematically unbiased to minimize the preference against low-mass members of stellar associations that dissipate first and to include potential members of diffuse components. We provide measurements of Hα and calcium H&K emission, as well as of Li i 6708 Å in absorption. This enables identification of stars as young as 10-30 Myr-a typical age range for stellar associations. We report on 346 stars showing detectable lithium absorption, 318 of which are not included in existing catalogues of young stars. We also report 125 additional stars in our sample presenting signs of stellar activity indicating youth but with no detectable lithium. Radial velocities are determined for WiFeS spectra with a precision of 3.2 km s-1 and 1.5 km s-1 for the Echelle sample. |
Keywords | stars: activity; stars: late-type; stars: pre-main-sequence; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Astrophysics of Galaxies |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Australian National University |
Center for Astrophysics Harvard and Smithsonian, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6x6x/a-spectroscopically-confirmed-gaia-selected-sample-of-318-new-young-stars-within-200-pc
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