Issue |
A&A
Volume 692, December 2024
|
|
---|---|---|
Article Number | A243 | |
Number of page(s) | 19 | |
Section | Galactic structure, stellar clusters and populations | |
DOI | https://doi.org/10.1051/0004-6361/202451677 | |
Published online | 18 December 2024 |
New stellar age estimates using SPInS based on Gaia DR3 photometry and LAMOST DR8 abundances
1
GEPI, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Paris Cité,
5 place Jules Janssen,
92190
Meudon,
France
2
LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université Paris Cité,
5 place Jules Janssen,
92195
Meudon,
France
3
Univ Rennes, CNRS, IPR (Institut de Physique de Rennes) –
UMR 6251,
35000
Rennes,
France
4
Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona (UB),
Martí i Franquès, 1,
08028
Barcelona,
Spain
5
Departament de Física Quàntica i Astrofísica (FQA), Universitat de Barcelona (UB),
Martí i Franquès, 1,
08028
Barcelona,
Spain
6
Institut d’Estudis Espacials de Catalunya (IEEC),
Esteve Terradas, 1, Edifici RDIT, Campus PMT-UPC,
08860
Castelldefels (Barcelona),
Spain
7
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange,
Nice,
France
★ Corresponding author; laia.casamiquela@obspm.fr
Received:
26
July
2024
Accepted:
20
October
2024
Context. Reliable stellar age estimates are fundamental for testing several problems in modern astrophysics, in particular since they set the timescales of Galactic dynamical and chemical evolution.
Aims. In this study, we determine ages using only Gaia DR3 photometry and parallaxes, in combination with interstellar extinction maps, and spectroscopic metallicities and α abundances from the latest data release (DR8) of the LAMOST survey. In contrast with previous age estimates, we do not use spectroscopic effective temperatures or surface gravities, and thus we rely on the excellent precision and accuracy of the Gaia photometry.
Methods. We use a new version of the publicly available SPInS code with improved features, including the on-the-fly computation of the autocorrelation time and the automatic convergence evaluation.
Results. We determine reliable age estimates for 35 096 and 243 768 sub-giant and main-sequence turn-off stars in the LAMOST DR8 low- and medium-resolution surveys with typical uncertainties smaller than 10%. In addition, we successfully test our method on more than 4000 stars of 14 well-studied open and globular star clusters covering a wide range of ages, confirming the reliability of our age and uncertainty estimates.
Key words: Galaxy: evolution / Galaxy: general / solar neighborhood
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This article is published in open access under the Subscribe to Open model. Subscribe to A&A to support open access publication.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.