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

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 NavarroQuentin Parker, Warren Reid, George Seabroke

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
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Abstract

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 (∂VR /∂R) for young stars, with metal-rich stars having a much steeper gradient than metal-poor stars. For ∂VΦ /∂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.

Original languageEnglish
Pages (from-to)5612-5624
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume477
Issue number4
DOIs
Publication statusPublished - 11 Jul 2018

Bibliographical note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 477, Issue 4, July 2018, Pages 5612–5624, https://doi.org/10.1093/mnras/stx2704. Copyright 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Keywords

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

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