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Stellar ages and masses in the solar neighbourhood: Bayesian analysis using spectroscopy and Gaia DR1 parallaxes

Lin, Jinying (Jane); Dotter, Aaron; Ting, Yuan-Sen; Asplund, Martin

Description

We present a Bayesian implementation of isochrone fitting in deriving stellar ages and masses, incorporating absolute K magnitude (MK) derived from 2MASS photometry and Gaia DR1 parallax and differentiation between initial bulk metallicity and present-day surface metallicity, with allowance for incorporating further constraints (e.g. asteroseismology) when available. As a test, we re-computed stellar ages and masses of ∼4000 stars in the solar neighbourhood from six well-studied literature...[Show more]

dc.contributor.authorLin, Jinying (Jane)
dc.contributor.authorDotter, Aaron
dc.contributor.authorTing, Yuan-Sen
dc.contributor.authorAsplund, Martin
dc.date.accessioned2020-01-15T00:04:38Z
dc.date.available2020-01-15T00:04:38Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/197329
dc.description.abstractWe present a Bayesian implementation of isochrone fitting in deriving stellar ages and masses, incorporating absolute K magnitude (MK) derived from 2MASS photometry and Gaia DR1 parallax and differentiation between initial bulk metallicity and present-day surface metallicity, with allowance for incorporating further constraints (e.g. asteroseismology) when available. As a test, we re-computed stellar ages and masses of ∼4000 stars in the solar neighbourhood from six well-studied literature samples using both Hipparcos and TGAS parallaxes. Our ages are found to be compatible with literature values but with reduced uncertainties in general. The inclusion of parallax-based MK serves as an additional constraint on the derived quantities, especially when systematic errors in stellar parameters are underestimated. We reconstructed the age–metallicity relationship in the solar neighbourhood by re-analysing the Geneva-Copenhagen Survey with the inclusion of TGAS-parallaxes and initial bulk metallicity sampling. We found a flat trend for disc stars with ages <11 Gyr but with smaller scatter at all ages compared to literature.
dc.description.sponsorshipWe acknowledge generous funding from the Australian Research Council through a Laureate Fellowship awarded to MA (grant FL110100012)
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherOxford University Press
dc.rights© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.titleStellar ages and masses in the solar neighbourhood: Bayesian analysis using spectroscopy and Gaia DR1 parallaxes
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume477
dc.date.issued2018
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.absfor010404 - Probability Theory
local.identifier.ariespublicationa383154xPUB10329
local.publisher.urlhttps://academic.oup.com/journals/
local.type.statusPublished Version
local.contributor.affiliationLin, Jinying (Jane), College of Science, ANU
local.contributor.affiliationDotter, Aaron, Harvard-Smithsonian Center for Astrophysics
local.contributor.affiliationTing, Yuan, College of Science, ANU
local.contributor.affiliationAsplund, Martin, College of Science, ANU
dc.relationhttp://purl.org/au-research/grants/arc/FL110100012
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage2966
local.bibliographicCitation.lastpage2975
local.identifier.doi10.1093/mnras/sty709
local.identifier.absseo970101 - Expanding Knowledge in the Mathematical Sciences
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2019-11-25T07:20:25Z
local.identifier.scopusID2-s2.0-85047155642
dcterms.accessRightsOpen Access
dc.provenancehttp://www.sherpa.ac.uk/romeo/issn/0035-8711/..."author can archive publisher's version/PDF" from SHERPA/RoMEO site (as at 15/01/2020). This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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