Confirming chemical clocks: asteroseismic age dissection of the Milky Way disc(s)
-
Altmetric Citations
Aguirre, V Silva; Bojsen-Hansen, Mathias; Slumstrup, D.; Casagrande, Luca; Kawata, D.; Ciuca, Ioana; Handberg, Rasmus; Lund, M.N.; Mosumgaard, Jakob Rørsted; Huber, D; Johnson, J A
Description
Investigations of the origin and evolution of the Milky Way disc have long relied on chemical and kinematic identifications of its components to reconstruct our Galactic past. Difficulties in determining precise stellar ages have restricted most studies to small samples, normally confined to the solar neighbourhood. Here, we break this impasse with the help of asteroseismic inference and perform a chronology of the evolution of the disc throughout the age of the Galaxy. We chemically dissect...[Show more]
dc.contributor.author | Aguirre, V Silva | |
---|---|---|
dc.contributor.author | Bojsen-Hansen, Mathias | |
dc.contributor.author | Slumstrup, D. | |
dc.contributor.author | Casagrande, Luca | |
dc.contributor.author | Kawata, D. | |
dc.contributor.author | Ciuca, Ioana | |
dc.contributor.author | Handberg, Rasmus | |
dc.contributor.author | Lund, M.N. | |
dc.contributor.author | Mosumgaard, Jakob Rørsted | |
dc.contributor.author | Huber, D | |
dc.contributor.author | Johnson, J A | |
dc.date.accessioned | 2019-09-02T00:11:45Z | |
dc.date.available | 2019-09-02T00:11:45Z | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.uri | http://hdl.handle.net/1885/165451 | |
dc.description.abstract | Investigations of the origin and evolution of the Milky Way disc have long relied on chemical and kinematic identifications of its components to reconstruct our Galactic past. Difficulties in determining precise stellar ages have restricted most studies to small samples, normally confined to the solar neighbourhood. Here, we break this impasse with the help of asteroseismic inference and perform a chronology of the evolution of the disc throughout the age of the Galaxy. We chemically dissect the Milky Way disc population using a sample of red giant stars spanning out to 2 kpc in the solar annulus observed by the Kepler satellite, with the added dimension of asteroseismic ages. Our results reveal a clear difference in age between the low- and high-α populations, which also show distinct velocity dispersions in the V and W components. We find no tight correlation between age and metallicity nor [α/Fe] for the high-α disc stars. Our results indicate that this component formed over a period of more than 2 Gyr with a wide range of [M/H] and [α/Fe] independent of time. Our findings show that the kinematic properties of young α-rich stars are consistent with the rest of the high-α population and different from the low-α stars of similar age, rendering support to their origin being old stars that went through a mass transfer or stellar merger event, making them appear younger, instead of migration of truly young stars formed close to the Galactic bar. | |
dc.description.sponsorship | Funding for this Discovery mission is provided by NASA’s Science Mission Directorate. The authors acknowledge the dedicated team behind the Kepler and K2 missions, without whom this work would not have been possible. Funding for the Stellar Astrophysics Centre is provided by The Danish National Research Foundation (Grant agreement no. DNRF106). VSA acknowledges support from VILLUM FONDEN (Research Grant 10118). LC is the recipient of an Australian Research Council Future Fellowship (project no. FT160100402). DK and IC acknowledge the support of the UK’s Science and Technology Facilities Council (STFC Grant ST/N000811/1 and Doctoral Training Partnerships Grant ST/N504488/1). MNL acknowledges the support of The Danish Council for Independent Research – Natural Science (Grant DFF-4181-00415). DH acknowledges support by the Australian Research Council’s Discovery Projects funding scheme (project number DE140101364) and support by the National Aeronautics and Space Administration under Grant NNX14AB92G issued through the Kepler Participating Scientist Program. JAJ, MP, and JT acknowledge support from NSF Grant AST-1211673. AS acknowledges support from grant ESP2015-66134-R (MINECO). DS is the recipient of an Australian Research Council Future Fellowship (project number FT1400147). WHT acknowledges funding from the European Research Council under the European Union’s Seventh Framework Programme (FP 7) ERC Grant agreement no. 321035. Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS acknowledges support and resources from the Center for HighPerformance Computing at the University of Utah | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | Oxford University Press | |
dc.rights | © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. | |
dc.source | Monthly Notices of the Royal Astronomical Society | |
dc.title | Confirming chemical clocks: asteroseismic age dissection of the Milky Way disc(s) | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 475 | |
dc.date.issued | 2018 | |
local.identifier.absfor | 020110 - Stellar Astronomy and Planetary Systems | |
local.identifier.absfor | 020104 - Galactic Astronomy | |
local.identifier.ariespublication | u4485658xPUB2130 | |
local.publisher.url | http://www.oxfordjournals.org/ | |
local.type.status | Published Version | |
local.contributor.affiliation | Aguirre, V Silva, Aarhus University | |
local.contributor.affiliation | Bojsen-Hansen, Mathias, Aarhus University | |
local.contributor.affiliation | Slumstrup, D., Aarhus University | |
local.contributor.affiliation | Casagrande, Luca, College of Science, ANU | |
local.contributor.affiliation | Kawata, D., University College London | |
local.contributor.affiliation | Ciuca, Ioana, University College London | |
local.contributor.affiliation | Handberg, Rasmus, Aarhus University | |
local.contributor.affiliation | Lund, M.N., Aarhus University | |
local.contributor.affiliation | Mosumgaard, Jakob Rørsted, Aarhus University | |
local.contributor.affiliation | Huber, D, University of Sydney | |
local.contributor.affiliation | Johnson, J A, Ohio State University | |
dc.relation | http://purl.org/au-research/grants/arc/FT160100402 | |
dc.relation | http://purl.org/au-research/grants/arc/DE140101364 | |
local.bibliographicCitation.issue | 4 | |
local.bibliographicCitation.startpage | 5487 | |
local.bibliographicCitation.lastpage | 5500 | |
local.identifier.doi | 10.1093/mnras/sty150 | |
local.identifier.absseo | 970102 - Expanding Knowledge in the Physical Sciences | |
dc.date.updated | 2019-04-14T08:27:12Z | |
local.identifier.thomsonID | 000428835700085 | |
dcterms.accessRights | Open Access | |
dc.provenance | http://www.sherpa.ac.uk/romeo/issn/0035-8711/..."author can archive publisher's version/PDF" from SHERPA/RoMEO site (as at 02/09/19) | |
Collections | ANU Research Publications |
Download
File | Description | Size | Format | Image |
---|---|---|---|---|
01_Aguirre_Confirming_chemical_clocks%3A_2018.pdf | 2.86 MB | Adobe PDF |
Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.
Updated: 17 November 2022/ Responsible Officer: University Librarian/ Page Contact: Library Systems & Web Coordinator