Journal article
The GALAH survey: co-orbiting stars and chemical tagging
Monthly notices of the Royal Astronomical Society, Vol.482(4), pp.5302-5315
02/01/2019
DOI: 10.1093/mnras/sty3042
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. They identified these pairs as potentially co-moving pairs using proper motions and parallaxes from Gaia DR1. We find that 11 very wide (>1 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.
Details
- Title: Subtitle
- The GALAH survey: co-orbiting stars and chemical tagging
- Creators
- Jeffrey D. Simpson - UNSW SydneySarah L. Martell - ASTRO-3DGary Da Costa - Australian National UniversityAndrew R. Casey - Monash UniversityKen C. Freeman - Australian National UniversityJonathan Horner - University of Southern QueenslandYuan-Sen Ting - Institute for Advanced StudyDavid M. Nataf - Johns Hopkins UniversityGeraint F. Lewis - The University of SydneyMelissa K. Ness - Columbia UniversityDaniel B. Zucker - Macquarie UniversityPeter L. Cottrell - Monash UniversityKlemen Cotar - University of LjubljanaMartin Asplund - ARC Centre of Excellence for All-sky AstrophysicsJoss Bland-Hawthorn - The University of SydneySven Buder - Max Planck Institute for AstronomyValentina D'Orazi - Osserv Astron Padova, Ist Nazl Astrofis, Vicolo Osservatorio 5, I-35122 Padua, ItalyGayandhi M. De Silva - Macquarie UniversityLy Duong - Australian National UniversityJanez Kos - The University of SydneyJane Lin - Australian National UniversityKarin Lind - Max Planck Institute for AstronomyKatharine J. Schlesinger - Australian National UniversitySanjib Sharma - The University of SydneyTomaz Zwitter - University of LjubljanaPrajwal R. Kafle - International Centre for Radio Astronomy ResearchThomas Nordlander - ARC Centre of Excellence for All-sky Astrophysics
- Resource Type
- Journal article
- Publication Details
- Monthly notices of the Royal Astronomical Society, Vol.482(4), pp.5302-5315
- DOI
- 10.1093/mnras/sty3042
- ISSN
- 0035-8711
- eISSN
- 1365-2966
- Publisher
- Oxford Univ Press
- Number of pages
- 14
- Grant note
- Zonta International District 24 2015-00415 / Swedish Research Council 2015-00415 / Vinnova CE170100013 / Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D); Australian Research Council A/2013B/13; A/2014A/25; A/2015A/19; A/2017A/18 / Australian Astronomical Observatory 2015-00415 3 / Swedish Research Council Alexander von Humboldt Foundation P1-0188 / Slovenian Research Agency; Slovenian Research Agency - Slovenia INCA 600398 / Marie Sklodowska Curie Actions; Marie Curie Actions DP180101791; DP160103747; DP160100637 / Australian Research Council
- Language
- English
- Date published
- 02/01/2019
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984701831302771
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