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

Jane Lin*, Aaron Dotter, Yuan Sen Ting, Martin Asplund

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    20 Citations (Scopus)

    Abstract

    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 bulkmetallicity 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 bulkmetallicity sampling.We found a flat trend for disc stars with ages < 11 Gyr but with smaller scatter at all ages compared to literature.

    Original languageEnglish
    Pages (from-to)2966-2975
    Number of pages10
    JournalMonthly Notices of the Royal Astronomical Society
    Volume477
    Issue number3
    DOIs
    Publication statusPublished - 1 Jul 2018

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