The age-metallicity relation in the solar neighbourhood from a pilot sample of white dwarf-main sequence binaries

A. Rebassa-Mansergas*, B. Anguiano, E. García-Berro, K. C. Freeman, R. Cojocaru, C. J. Manser, A. F. Pala, B. T. Gänsicke, X. W. Liu

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)

    Abstract

    The age-metallicity relation (AMR) is a fundamental observational constraint for understanding how the Galactic disc formed and evolved chemically in time. However, there is not yet an agreement on the observational properties of the AMR for the solar neighbourhood, primarily due to the difficulty in obtaining accurate stellar ages for individual field stars.We have started an observational campaign for providing the much needed observational input by using wide white-dwarf-main-sequence (WDMS) binaries. White dwarfs are 'natural' clocks and can be used to derive accurate ages. Metallicities can be obtained from the main-sequence companions. Since the progenitors of white dwarfs and the main-sequence stars were born at the same time, WDMS binaries provide a unique opportunity to observationally constrain in a robust way the properties of the AMR. In this work we present the AMR derived from analysing a pilot sample of 23 WDMS binaries and provide clear observational evidence for the lack of correlation between age and metallicity at young and intermediate ages (0-7 Gyr).

    Original languageEnglish
    Pages (from-to)1137-1143
    Number of pages7
    JournalMonthly Notices of the Royal Astronomical Society
    Volume463
    Issue number2
    DOIs
    Publication statusPublished - 1 Dec 2016

    Keywords

    • Binaries: spectroscopic
    • Solar neighbourhood
    • Stars: abundances
    • Stars: low-mass
    • White dwarfs

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