Chromospheric activity of nearby Sun-like stars Virtual Observatory Resource

Authors
  1. Gondoin P.
  2. Published by
    CDS
Abstract

The chromospheric emission in the cores of the CaII H & K lines of late-type dwarfs is a well known indicator of magnetic activity that decreases with increasing stellar age. I use this indicator to investigate the formation history of nearby G- and early K-type stars with origins at galactocentric distances similar to that of the region where the Sun was born. A parent sample of single main-sequence stars with near-solar metallicity and known magnetic activity levels is built from catalogues of stellar atmospheric parameters and chromospheric activity indices. A kinematical approach uses Gaia astrometric data to differentiate thin disc stars from thick disc stars. Measured distributions of R'_HK_ chromospheric activity indices are compared with Monte Carlo simulations based on an empirical model of chromospheric activity evolution. The thin disc includes a significant fraction of Sun-like stars with intermediate activity levels while most early K- and G-type stars from the thick disc are inactive. The chromospheric activity distribution among nearby Sun-like dwarfs from the thin disc can be explained by a combination of an old (>6-7Gyr) star formation event (or events) and a more recent (<3Gyr) burst of star formation. Such an event is not required to account for the R'_HK_ index distributions of nearby thick disc stars. The distribution of magnetic activity among local G- and early K-type stars with a near-solar metallicity bears the imprint of an important star formation event that occurred ~1.9 to 2.6Gyr ago in the thin disc of the Milky Way.

Keywords
  1. late-type-stars
  2. visible-astronomy
  3. narrow-band-photometry
Bibliographic source Bibcode
2020A&A...641A.110G
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/641/A110
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/641/A110
Document Object Identifer DOI
doi:10.26093/cds/vizier.36410110

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/641/A110
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/641/A110
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/641/A110
IVOA Table Access TAP
http://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).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/641/A110/tableb1?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/641/A110/tableb1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/641/A110/tableb1?

History

2020-09-16T06:50:20Z
Resource record created
2020-09-16T06:50:20Z
Created
2021-04-27T10:57:15Z
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