The GALAH survey: co-orbiting stars and chemical tagging
Article
Article Title | The GALAH survey: co-orbiting stars and chemical tagging |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Simpson, Jeffrey D. (Author), Martell, Sarah L. (Author), Da Costa, Gary (Author), Casey, Andrew R. (Author), Freeman, Ken C. (Author), Horner, Jonathan (Author), Ting, Yuan-Sen (Author), Nataf, David M. (Author), Lewis, Geraint F. (Author), Ness, Melissa K. (Author), Zucker, Daniel B. (Author), Cottrell, Peter L. (Author), Cotar, Klemen (Author), Asplund, Martin (Author), Bland-Hawthorn, Joss (Author), Buder, Sven (Author), D'Orazi, Valentina (Author), de Silva, Gayandhi M. (Author), Duong, Ly (Author), Kos, Janez (Author), Lin, Jane (Author), Lind, Karin (Author), Schlesinger, Katharine J. (Author), Sharma, Sanjib (Author), Zwitter, Tomaz (Author), Kafle, Prajwal R. (Author) and Nordlander, Thomas (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 482 (4), pp. 5302-5315 |
Number of Pages | 14 |
Year | 2019 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/sty3042 |
Web Address (URL) | https://academic.oup.com/mnras/article/482/4/5302/5173100 |
Abstract | We present a study using the second data release of the GALAH survey of stellar parameters and elemental abundances of 15 pairs of stars identified by Oh et al 2017. They identified these pairs as potentially co-moving pairs using proper motions and parallaxes from Gaia DR1. We find that 11 very wide (>1.7 pc) pairs of stars do in fact have similar Galactic orbits, while a further four claimed co-moving pairs are not truly co-orbiting. Eight of the 11 co-orbiting pairs have reliable stellar parameters and abundances, and we find that three of those are quite similar in their abundance patterns, while five have significant [Fe/H] differences. For the latter, this indicates that they could be co-orbiting because of the general dynamical coldness of the thin disc, or perhaps resonances induced by the Galaxy, rather than a shared formation site. Stars such as these, wide binaries, debris of past star formation episodes, and coincidental co-orbiters, are crucial for exploring the limits of chemical tagging in the Milky Way. |
Keywords | astrophysics; astrophysics of galaxies; solar astrophysics; stellar astrophysics |
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 ©: 2019 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of New South Wales |
Australian National University | |
Monash University | |
Centre for Astrophysics | |
Institute for Advanced Study, United States | |
Johns Hopkins University, United States | |
University of Sydney | |
Columbia University, United States | |
Macquarie University | |
University of Canterbury, New Zealand | |
University of Ljubljana, Slovenia | |
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions, Australia | |
Max Planck Society, Germany | |
National Institute for Astrophysics, Italy | |
Australian Astronomical Observatory, Australia | |
University of Western Australia |
https://research.usq.edu.au/item/q5192/the-galah-survey-co-orbiting-stars-and-chemical-tagging
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