Catalogue of members of Vela OB2 Virtual Observatory Resource

Authors
  1. Armstrong J.J.
  2. Wright N.J.
  3. Jeffries R.D.
  4. Jackson R.J.
  5. Cantat-Gaudin T.
  6. Published by
    CDS
Abstract

The kinematics of stars in OB associations can provide insights into their formation, dynamical evolution, and eventual fate. The low-mass stellar content of OB associations are sufficiently numerous as to provide a detailed sampling of their kinematic properties, however spectroscopy is required to confirm the youth of individual stars and to get 3D kinematics. In this paper we present and analyse results from a large spectroscopic survey of Vela OB2 conducted using 2dF/HERMES on the AAT. This spectroscopy is used to confirm the youth of candidate young stars and determine radial velocities, which are combined with proper motions and parallaxes from Gaia to measure 3-dimensional positions and velocities. We identify multiple separate kinematic groups in the region, for which we measure velocity dispersions and infer their virial states. We measure expansion rates for all these groups and find strong evidence for anisotropic expansion in the Vela OB2 association of at least 11 sigma significance in all three dimensions, as well as some evidence for expansion in the gamma Vel and P Puppis clusters. We trace back the motions of these groups into the past and find that the open cluster NGC 2547 is an interloper in the Vela OB2 region and actually formed >100pc away from the association. We conclude that Vela OB2 must have formed with considerable spatial and kinematic substructure over a timescale of ~10Myr, with clear temporal substructure within the association, but no clear evidence for an age gradient.

Keywords
  1. Stellar associations
  2. Open star clusters
  3. Spectroscopy
  4. Pre-main sequence stars
  5. Proper motions
  6. Optical astronomy
  7. Trigonometric parallax
Bibliographic source Bibcode
2022MNRAS.517.5704A
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/517/5704
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/517/5704

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/517/5704
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/517/5704
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/517/5704
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/517/5704/table1?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/517/5704/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/517/5704/table1?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/517/5704/table2?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/517/5704/table2?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/517/5704/table2?

History

2022-11-14T09:50:55Z
Resource record created
2022-11-14T09:50:55Z
Created
2022-11-16T06:20:49Z
Updated

Contact

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