1. Constraining the solar neighbourhood age–metallicity relation from white dwarf–main sequence binaries
- Author
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N. Castro-Rodríguez, M. E. Camisassa, Mark Hollands, Detlev Koester, Tim Cunningham, A. T. Knowles, Roberto Raddi, Pier-Emmanuel Tremblay, Alberto Rebassa-Mansergas, Santiago Torres, Jinwei Ren, Matthew J. Hoskin, Jesus Maldonado, and Boris T. Gänsicke
- Subjects
Physics ,Proper motion ,010308 nuclear & particles physics ,media_common.quotation_subject ,Metallicity ,Neighbourhood (graph theory) ,food and beverages ,FOS: Physical sciences ,White dwarf ,Astronomy and Astrophysics ,Astrophysics ,Astrophysics - Astrophysics of Galaxies ,01 natural sciences ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Sky ,Astrophysics of Galaxies (astro-ph.GA) ,0103 physical sciences ,Binary star ,10. No inequality ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Main sequence ,Open cluster ,media_common - Abstract
The age-metallicity relation is a fundamental tool for constraining the chemical evolution of the Galactic disc. In this work we analyse the observational properties of this relation using binary stars that have not interacted consisting of a white dwarf - from which we can derive the total age of the system - and a main sequence star - from which we can derive the metallicity as traced by the [Fe/H] abundances. Our sample consists of 46 widely separated, but unresolved spectroscopic binaries identified within the Sloan Digital Sky Survey, and 189 white dwarf plus main sequence common proper motion pairs identified within the second data release of Gaia. This is currently the largest white dwarf sample for which the metallicity of their progenitors have been determined. We find a flat age-metallicity relation displaying a scatter of [Fe/H] abundances of approximately 0.5 dex around the solar metallicity at all ages. This independently confirms the lack of correlation between age and metallicity in the solar neighbourhood that is found in previous studies focused on analysing single main sequence stars and open clusters., Comment: Accepted for publication by MNRAS
- Published
- 2021