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 »
- Authors:
-
[1];
- Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
- 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
- Department of Physics & Astronomy, Texas Christian University, Fort Worth, TX 76129, USA
- 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
- 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
- Centro de Astronomía (CITEVA), Universidad de Antofagasta, Avenida Angamos 601, Antofagasta 1270300, Chile
- 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. doi: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}
}
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