Spatial variations in the Milky Way disc metallicity-age relation

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dc.contributor.authorFeuillet, Diane K.
dc.contributor.authorFrankel, Neige
dc.contributor.authorLind, Karin
dc.contributor.authorFrinchaboy, Peter M.
dc.contributor.authorGarcia-Hernandez, D. A.
dc.contributor.authorLane, Richard R.
dc.contributor.authorNitschelm, Christian
dc.contributor.authorRoman-Lopes, Alexandre
dc.date.accessioned2025-01-23T21:11:01Z
dc.date.available2025-01-23T21:11:01Z
dc.date.issued2019
dc.description.abstractStellar ages are a crucial component to studying the evolution of the Milky Way. Using Gaia DR2 distance estimates, it is now possible to estimate stellar ages for a larger volume of evolved stars through isochrone matching. This work presents [M/H]-age and [alpha/M]-age relations derived for different spatial locations in the Milky Way disc. These relations are derived by hierarchically modelling the star formation history of stars within a given chemical abundance bin. For the first time, we directly observe that significant variation is apparent in the [M/H]-age relation as a function of both Galactocentric radius and distance from the disc midplane. The [M/H]-age relations support claims that radial migration has a significant effect in the plane of the disc. Using the [M/H] bin with the youngest mean age at each radial zone in the plane of the disc, the present-day metallicity gradient is measured to be -0.059 +/- 0.010 dex kpc(-1), in agreement with Cepheids and young field stars. We find a vertically flared distribution of young stars in the outer disc, confirming predictions of models and previous observations. The mean age of the [M/H]-[alpha/M] distribution of the solar neighbourhood suggests that the high-[M/H] stars are not an evolutionary extension of the low-alpha sequence. Our observational results are important constraints to Galactic simulations and models of chemical evolution.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stz2221
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stz2221
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/100875
dc.identifier.wosidWOS:000489298100018
dc.issue.numero2
dc.language.isoen
dc.pagina.final1752
dc.pagina.inicio1742
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectGalaxy: abundances
dc.subjectGalaxy: disc
dc.subjectGalaxy: evolution
dc.subjectGalaxy: stellar content
dc.titleSpatial variations in the Milky Way disc metallicity-age relation
dc.typeartículo
dc.volumen489
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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