Outer Galactic disk A and F stars space motions Virtual Observatory Resource

Authors
  1. Harris A.
  2. Drew J.E.
  3. Monguio M.
  4. Published by
    CDS
Abstract

A and F stars can be used as probes of outer Galactic disk kinematics: here we extend the work of Harris et al. (2018, Cat. J/MNRAS/475/1680) by crossmatching their A/F sample with Gaia DR2 to bring in proper motions. These are combined with the already measured radial velocities and spectro-photometric distances to obtain full space motions. We use this sample of 1173 stars, located in two pencil-beam sightlines (l=178{deg} and l=118{deg}), to sample the Galactocentric velocity field out to almost R_G_=15kpc. We find there are significant differences in all three (radial, azimuthal and vertical) kinematic components between the two directions. The rotation curve is roughly flat in the anticentre direction, confirming and extending the result of Kawata et al. (2018MNRAS.479L.108K) thanks to the greater reach of our spectro-photometric distance scale. However at l=118{deg} the circular velocity rises outwards from R_G_=10.5kpc and there is a more pronounced gradient in radial motion than is seen at l=178{deg}. Furthermore, the A star radial motion differs from the F stars by ~10km/s. We discuss our findings in the context of perturbers potentially responsible for the trends, such as the central bar, spiral arms, the warp and external satellites. Our results at l=178{deg} are broadly consistent with previous work on K giants in the anticentre, but the kinematics at l=118{deg} in the Perseus region do not yet reconcile easily with bar or spiral arm perturbation.

Keywords
  1. galaxy-planes
  2. milky-way-galaxy
  3. radial-velocity
  4. proper-motions
  5. spectrophotometry
  6. early-type-stars
Bibliographic source Bibcode
2019MNRAS.485.2312H
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/485/2312
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/485/2312
Document Object Identifer DOI
doi:10.26093/cds/vizier.74852312

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/485/2312
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/485/2312
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/485/2312
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/MNRAS/485/2312/table?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/485/2312/table?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/485/2312/table?

History

2019-03-26T08:03:25Z
Resource record created
2019-03-26T08:03:25Z
Created
2024-08-19T20:17:18Z
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