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The GALAH survey: Co-orbiting stars and chemical tagging

Simpson, Jeffrey D.; Martell, Sarah; Da Costa, Gary; Casey, Andrew; Freeman, Kenneth; Horner, Jonathan; Ting, Yuan-Sen; Nataf, David M.; Lewis, Geraint Francis; Ness, Mellisa K.; Zucker, Daniel; Cottrell, P. L.; Asplund, Martin; Duong, Ly; Lin, Jane; Schlesinger, Katharine; Nordlander, Thomas

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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...[Show more]

dc.contributor.authorSimpson, Jeffrey D.
dc.contributor.authorMartell, Sarah
dc.contributor.authorDa Costa, Gary
dc.contributor.authorCasey, Andrew
dc.contributor.authorFreeman, Kenneth
dc.contributor.authorHorner, Jonathan
dc.contributor.authorTing, Yuan-Sen
dc.contributor.authorNataf, David M.
dc.contributor.authorLewis, Geraint Francis
dc.contributor.authorNess, Mellisa K.
dc.contributor.authorZucker, Daniel
dc.contributor.authorCottrell, P. L.
dc.contributor.authorAsplund, Martin
dc.contributor.authorDuong, Ly
dc.contributor.authorLin, Jane
dc.contributor.authorSchlesinger, Katharine
dc.contributor.authorNordlander, Thomas
dc.date.accessioned2021-05-10T01:42:49Z
dc.date.available2021-05-10T01:42:49Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/232564
dc.description.abstractWe 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.
dc.description.sponsorshipParts of this research were conducted by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. JDS and SLM acknowledge the support of the Australian Research Council through Discovery Project grant DP180101791. SB and KL acknowledge funds from the Alexander von Humboldt Foundation in the framework of the Sofja Kovalevskaja Award endowed by the Federal Ministry of Education and Research. LD gratefully acknowledges a scholarship from Zonta International District 24 and support from Australian Research Council grant DP160103747. KL acknowledges funds from the Swedish Research Council (Grant nr. 2015-00415 3) and Marie Sklodowska Curie Actions (Cofund Project INCA 600398). TZ acknowledge the financial support from the Slovenian Research Agency (research core funding No. P1- 0188). A. R. C. acknowledges support through the Australian Research Council through grant DP160100637. LD, KF, and Y-ST are grateful for support from the Australian Research Council grant DP160103747.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherBlackwell Publishing Ltd
dc.rights© 2018 The Author(s)
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectstars: abundances
dc.subjectstars: formation
dc.subjectgalaxy: disc
dc.titleThe GALAH survey: Co-orbiting stars and chemical tagging
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume482
dcterms.dateAccepted2018-11-06
dc.date.issued2019-02
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationu3102795xPUB725
local.publisher.urlhttps://academic.oup.com/
local.type.statusPublished Version
local.contributor.affiliationSimpson, Jeffrey D., Australian Astronomical Observatory
local.contributor.affiliationMartell, Sarah, University of New South Wales
local.contributor.affiliationDa Costa, Gary, College of Science, ANU
local.contributor.affiliationCasey, Andrew, Monash University
local.contributor.affiliationFreeman, Kenneth, College of Science, ANU
local.contributor.affiliationHorner, Jonathan, University of Southern Queensland
local.contributor.affiliationTing, Yuan-Sen, Princeton University
local.contributor.affiliationNataf, David M., Johns Hopkins University
local.contributor.affiliationLewis, Geraint Francis, University of Sydney
local.contributor.affiliationNess, Mellisa K., Columbia University
local.contributor.affiliationZucker, Daniel, Macquarie University
local.contributor.affiliationCottrell, P. L., University of Canterbury
local.contributor.affiliationAsplund, Martin, College of Science, ANU
local.contributor.affiliationDuong, Ly, College of Science, ANU
local.contributor.affiliationLin, Jane, College of Science, ANU
local.contributor.affiliationSchlesinger, Katharine, College of Science, ANU
local.contributor.affiliationNordlander, Thomas, College of Science, ANU
dc.relationhttp://purl.org/au-research/grants/arc/CE170100013
dc.relationhttp://purl.org/au-research/grants/arc/DP180101791
dc.relationhttp://purl.org/au-research/grants/arc/DP160103747
dc.relationhttp://purl.org/au-research/grants/arc/DP160100637
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage5302
local.bibliographicCitation.lastpage5315
local.identifier.doi10.1093/mnras/sty3042
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2020-12-27T07:27:07Z
local.identifier.scopusID2-s2.0-85061089637
dcterms.accessRightsOpen Access
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/24618..."Published version can be made open access on institutional repository" from SHERPA/RoMEO site (as at 10.5.2021).
CollectionsANU Research Publications

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