Spatial variations in the Milky Way disc metallicity-age relation
Feuillet, Diane LU
; Frankel, Neige
; Lind, Karin
; Frinchaboy, Peter
; Garcia-Hernandez, D A
; Lane, Richard
; Nitschem, Christian
and Roman-Lopes, Alexandre
(2019)
In Monthly Notices of the Royal Astronomical Society
489(2).
p.1742-1752
- 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... (More)
- 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, 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/137b25ac-50f2-43d5-bd36-2ec80725ff8b
- author
- Feuillet, Diane
LU
; Frankel, Neige
; Lind, Karin
; Frinchaboy, Peter
; Garcia-Hernandez, D A
; Lane, Richard
; Nitschem, Christian
and Roman-Lopes, Alexandre
- publishing date
- 2019-10
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Galaxy: abundances, Galaxy: disc, Galaxy: evolution, Galaxy: stellar content, Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics
- in
- Monthly Notices of the Royal Astronomical Society
- volume
- 489
- issue
- 2
- article number
- 10.1093/mnras/stz2221
- pages
- 12 pages
- publisher
- Oxford University Press
- external identifiers
-
- scopus:85075123289
- ISSN
- 1365-2966
- DOI
- 10.1093/mnras/stz2221
- language
- English
- LU publication?
- no
- id
- 137b25ac-50f2-43d5-bd36-2ec80725ff8b
- date added to LUP
- 2019-11-27 10:35:10
- date last changed
- 2022-04-18 18:56:31
@article{137b25ac-50f2-43d5-bd36-2ec80725ff8b,
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, 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.}},
author = {{Feuillet, Diane and Frankel, Neige and Lind, Karin and Frinchaboy, Peter and Garcia-Hernandez, D A and Lane, Richard and Nitschem, Christian and Roman-Lopes, Alexandre}},
issn = {{1365-2966}},
keywords = {{Galaxy: abundances; Galaxy: disc; Galaxy: evolution; Galaxy: stellar content; Astrophysics - Astrophysics of Galaxies; Astrophysics - Solar and Stellar Astrophysics}},
language = {{eng}},
number = {{2}},
pages = {{1742--1752}},
publisher = {{Oxford University Press}},
series = {{Monthly Notices of the Royal Astronomical Society}},
title = {{Spatial variations in the Milky Way disc metallicity-age relation}},
url = {{http://dx.doi.org/10.1093/mnras/stz2221}},
doi = {{10.1093/mnras/stz2221}},
volume = {{489}},
year = {{2019}},
}