Advanced

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

Wojno, Jennifer ; Kordopatis, Georges ; Steinmetz, Matthias ; McMillan, Paul LU ; Binney, James ; Famaey, Benoit ; Monari, Giacomo ; Minchev, Ivan ; Wyse, Rosemary F.G. and Antoja, Teresa , et al. (2018) In Monthly Notices of the Royal Astronomical Society 477(4). p.5612-5624
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... (More)


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.

(Less)
Please use this url to cite or link to this publication:
author
, et al. (More)
(Less)
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Galaxy: kinematics and dynamics, Galaxy: structure, Solar neighbourhood
in
Monthly Notices of the Royal Astronomical Society
volume
477
issue
4
pages
13 pages
publisher
Oxford University Press
external identifiers
  • scopus:85050153787
ISSN
0035-8711
DOI
10.1093/mnras/sty1016
language
English
LU publication?
yes
id
8f4dbc89-b126-4fd1-b827-48b9520c7e74
date added to LUP
2019-04-29 13:32:32
date last changed
2020-04-07 05:22:34
@article{8f4dbc89-b126-4fd1-b827-48b9520c7e74,
  abstract     = {<p><br>
                            We explore the connections between stellar age, chemistry, and kinematics across a Galactocentric distance of 7.5 &lt; R(kpc) &lt; 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 &lt; τ &lt; 3 Gyr) and old (8 &lt; τ &lt; 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<br>
                            <sub>R</sub><br>
                            /∂R) for young stars, with metal-rich stars having a much steeper gradient than metal-poor stars. For ∂V<br>
                            <sub>Φ</sub><br>
                            /∂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.<br>
                        </p>},
  author       = {Wojno, Jennifer and Kordopatis, Georges and Steinmetz, Matthias and McMillan, Paul and Binney, James and Famaey, Benoit and Monari, Giacomo and Minchev, Ivan and Wyse, Rosemary F.G. and Antoja, Teresa and Siebert, Arnaud and Carrillo, Ismael and Bland-Hawthorn, Joss and Grebel, Eva K. and Zwitter, Tomaž and Bienaymé, Olivier and Gibson, Brad and Kunder, Andrea and Munari, Ulisse and Navarro, Julio and Parker, Quentin and Reid, Warren and Seabroke, George},
  issn         = {0035-8711},
  language     = {eng},
  month        = {07},
  number       = {4},
  pages        = {5612--5624},
  publisher    = {Oxford University Press},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {Correlations between age, kinematics, and chemistry as seen by the RAVE survey},
  url          = {http://dx.doi.org/10.1093/mnras/sty1016},
  doi          = {10.1093/mnras/sty1016},
  volume       = {477},
  year         = {2018},
}