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Title: Spatial variations in the Milky Way disc metallicity–age relation

Abstract

ABSTRACT Stellar 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 [α/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 mid-plane. 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]–[α/M] distribution of the solar neighbourhood suggests that the high-[M/H] stars are not an evolutionary extensionmore » of the low-α sequence. Our observational results are important constraints to Galactic simulations and models of chemical evolution.« less

Authors:
ORCiD logo [1];  [1];  [2];  [3];  [4];  [5];  [6];  [7]
  1. Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
  2. Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany, Observational Astrophysics, Department of Physics and Astronomy, Uppsala University, Box 516, SE-571 20 Uppsala, Sweden
  3. Department of Physics & Astronomy, Texas Christian University, Fort Worth, TX 76129, USA
  4. Instituto de Astrofísica de Canarias (IAC), E-38205 La Laguna, Tenerife, Spain, Departmento de Astrofísica, Universidad de La Laguna (ULL), E-38205 La Laguna, Tenerife, Spain
  5. Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuna Mackenna 4860, 782-0436 Macul, Santiago, Chile, Millennium Institute of Astrophysics, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
  6. Centro de Astronomía (CITEVA), Universidad de Antofagasta, Avenida Angamos 601, Antofagasta 1270300, Chile
  7. Departamento de Física, Facultad de Ciencias, Universidad de La Serena, Cisternas 1200, La Serena, Chile
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1560908
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 489 Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Feuillet, Diane K., Frankel, Neige, Lind, Karin, Frinchaboy, Peter M., García-Hernández, D. A., Lane, Richard R., Nitschelm, Christian, and Roman-Lopes, Alexandre. Spatial variations in the Milky Way disc metallicity–age relation. United Kingdom: N. p., 2019. Web. https://doi.org/10.1093/mnras/stz2221.
Feuillet, Diane K., Frankel, Neige, Lind, Karin, Frinchaboy, Peter M., García-Hernández, D. A., Lane, Richard R., Nitschelm, Christian, & Roman-Lopes, Alexandre. Spatial variations in the Milky Way disc metallicity–age relation. United Kingdom. https://doi.org/10.1093/mnras/stz2221
Feuillet, Diane K., Frankel, Neige, Lind, Karin, Frinchaboy, Peter M., García-Hernández, D. A., Lane, Richard R., Nitschelm, Christian, and Roman-Lopes, Alexandre. Sat . "Spatial variations in the Milky Way disc metallicity–age relation". United Kingdom. https://doi.org/10.1093/mnras/stz2221.
@article{osti_1560908,
title = {Spatial variations in the Milky Way disc metallicity–age relation},
author = {Feuillet, Diane K. and Frankel, Neige and Lind, Karin and Frinchaboy, Peter M. and García-Hernández, D. A. and Lane, Richard R. and Nitschelm, Christian and Roman-Lopes, Alexandre},
abstractNote = {ABSTRACT Stellar 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 [α/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 mid-plane. 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]–[α/M] distribution of the solar neighbourhood suggests that the high-[M/H] stars are not an evolutionary extension of the low-α sequence. Our observational results are important constraints to Galactic simulations and models of chemical evolution.},
doi = {10.1093/mnras/stz2221},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 489,
place = {United Kingdom},
year = {2019},
month = {8}
}

Journal Article:
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https://doi.org/10.1093/mnras/stz2221

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