Abundances and ages of stars in the Milky Way bulge Virtual Observatory Resource

Authors
  1. Sit T.
  2. Ness M.K.
  3. Published by
    CDS
Abstract

The age and chemical characteristics of the Galactic bulge link to the formation and evolutionary history of the Galaxy. Data-driven methods and large surveys enable stellar ages and precision chemical abundances to be determined for vast regions of the Milky Way, including the bulge. Here, we use the data-driven approach of The Cannon, to infer the ages and abundances for 125367 stars in the Milky Way, using spectra from Apache Point Observatory Galaxy Evolution Experiment (apogee) DR14. We examine the ages and metallicities of 1654 bulge stars within R_GAL_<3.5kpc. We focus on fields with b<12{deg}, and out to longitudes of l<15{deg}. We see that stars in the bulge are about twice as old ({tau}=8Gyr), on average, compared to those in the solar neighborhood ({tau}=4Gyr), with a larger dispersion in [Fe/H] (~0.38 compared to 0.23dex). This age gradient comes primarily from the low-{alpha} stars. Looking along the Galactic plane, the very central field in the bulge shows by far the largest dispersion in [Fe/H] ({sigma}[Fe/H]~0.4dex) and line-of- sight velocity ({sigma}vr~90km/s), and simultaneously the smallest dispersion in age. Moving out in longitude, the stars become kinematically colder and less dispersed in [Fe/H], but show a much broader range of ages. We see a signature of the X-shape within the bulge at a latitude of b=8{deg}, but not at b=12{deg}. Future apogee and other survey data, with larger sampling, affords the opportunity to extend our approach and study in more detail, to place stronger constraints on models of the Milky Way.

Keywords
  1. stellar-ages
  2. metallicity
  3. galactic-center
  4. milky-way-galaxy
  5. effective-temperature
  6. infrared-astronomy
Bibliographic source Bibcode
2020ApJ...900....4S
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/900/4
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/900/4
Document Object Identifer DOI
doi:10.26093/cds/vizier.19000004

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/900/4
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/900/4
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/900/4
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/ApJ/900/4/table3?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/900/4/table3?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/900/4/table3?

History

2023-06-16T17:17:52Z
Resource record created
2023-06-16T16:20:45Z
Updated
2023-06-16T17:17:52Z
Created

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