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

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

Authors

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

Andrea Kunder

Ulisse Munari

Julio Navarro

Quentin Parker

Warren Reid

George Seabroke



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-off stars 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.∂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.

Journal Article Type Article
Publication Date Jul 11, 2018
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 477
Issue 4
Pages 5612-5624
APA6 Citation Wojno, J., Kordopatis, G., Steinmetz, M., McMillan, P., Binney, J., Famaey, B., …Seabroke, G. (2018). Correlations between age, kinematics, and chemistry as seen by the RAVE survey. Monthly notices of the Royal Astronomical Society, 477(4), 5612-5624. https://doi.org/10.1093/mnras/sty1016
DOI https://doi.org/10.1093/mnras/sty1016
Keywords Galaxy: kinematics and dynamics; Solar neighbourhood; Galaxy: structure
Publisher URL https://academic.oup.com/mnras/article-abstract/477/4/5612/4983134?redirectedFrom=fulltext
Copyright Statement This article has been accepted for publication in © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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Copyright Statement
This article has been accepted for publication in © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.







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