Evolution of Sun-like stars Virtual Observatory Resource

Authors
  1. Lehmann C.
  2. Murphy M.T.
  3. Liu F.
  4. Flynn C.
  5. Published by
    CDS
Abstract

Sun-like stars are well represented in the solar neighbourhood but are currently under-utilised, with many studies of chemical and kinematic evolution focusing on red giants (which can be observed further away) or turn-off stars (which have well measured ages). Recent surveys (e.g. GALAH) provide spectra for large numbers of nearby Sun-like stars, which provides an opportunity to apply our newly developed method for measuring metallicities, temperatures, and surface gravities - the epic algorithm - which yields improved ages via isochrone fitting. We test this on moving groups, by applying it to the large GALAH DR3 sample. This defines a sample of 72288 solar analogue targets for which the stellar parameter measurements are most precise and reliable. These stars are used to estimate, and test the accuracy and precision of, age measurements derived with the SAMD isochrone fitting algorithm. Using these ages, we recover the age-metallicity relationships for nearby (<=1kpc) moving groups, traced by solar analogues, and analyse them with respect to the stellar kinematics. In particular, we found that the age-metallicity relationships of all moving groups follows a particular trend of young (age<6Gyr) stars having constant metallicity and older (age>=6Gyr) stars decreasing in metallicity with increasing age. The Hercules stream carries the highest fraction of metal-rich young stars (~0.1dex) in our sample, which is consistent with a migrating population of stars from the inner Galaxy, and we discuss the possible causes of this migration in the context of our results.

Keywords
  1. milky-way-galaxy
  2. g-stars
  3. chemical-abundances
  4. stellar-ages
  5. visible-astronomy
Bibliographic source Bibcode
2025MNRAS.536..498L
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/536/498
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/536/498
Document Object Identifer DOI
doi:10.26093/cds/vizier.75360498

Access

Web browser access HTML
https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/536/498
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/536/498
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/536/498
IVOA Table Access TAP
https://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/536/498/catalog?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/536/498/catalog?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/536/498/catalog?

History

2024-12-11T14:42:17Z
Resource record created
2024-12-11T14:42:17Z
Created
2025-02-24T20:16:59Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr