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Photo of Paul McMillan

Paul McMillan

Researcher

Photo of Paul McMillan

Correlations between age, kinematics, and chemistry as seen by the RAVE survey

Author

  • Jennifer Wojno
  • Georges Kordopatis
  • Matthias Steinmetz
  • Paul McMillan
  • James Binney
  • Benoit Famaey
  • Giacomo Monari
  • Ivan Minchev
  • Rosemary F.G. Wyse
  • Teresa Antoja
  • Arnaud Siebert
  • Ismael Carrillo
  • Joss Bland-Hawthorn
  • Eva K. Grebel
  • Tomaž Zwitter
  • Olivier Bienaymé
  • Brad Gibson
  • Andrea Kunder
  • Ulisse Munari
  • Julio Navarro
  • Quentin Parker
  • Warren Reid
  • George Seabroke

Summary, in English


We explore the connections between stellar age, chemistry, and kinematics across a Galactocentric distance of 7.5 < R(kpc) < 9.0, using a sample of ~12 000 intermediate-mass (FGK) turn-offstars observed with the RAdial Velocity Experiment (RAVE) survey. The kinematics of this sample are determined using radial velocity measurements from RAVE, and parallax and proper motion measurements from the Tycho-Gaia Astrometric Solution (TGAS). In addition, ages for RAVE stars are determined using a Bayesian method, taking TGAS parallaxes as a prior. We divide our sample into young (0 < τ < 3 Gyr) and old (8 < τ < 13 Gyr) populations, and then consider different metallicity bins for each of these age groups. We find significant differences in kinematic trends of young and old, metal-poor and metal-rich, stellar populations. In particular, we find a strong metallicity dependence in the mean Galactocentric radial velocity as a function of radius (∂V
R
/∂R) for young stars, with metal-rich stars having a much steeper gradient than metal-poor stars. For ∂V
Φ
/∂R, young, metal-rich stars significantly lag the LSR with a slightly positive gradient, while metal-poor stars show a negative gradient above the LSR. We interpret these findings as correlations between metallicity and the relative contributions of the non-axisymmetries in the Galactic gravitational potential (the spiral arms and the bar) to perturb stellar orbits.

Department/s

  • Lund Observatory

Publishing year

2018-07-11

Language

English

Pages

5612-5624

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

477

Issue

4

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Galaxy: kinematics and dynamics
  • Galaxy: structure
  • Solar neighbourhood

Status

Published

ISBN/ISSN/Other

  • ISSN: 0035-8711