The rich are different : evidence from the RAVE survey for stellar radial migration

Kordopatis, Georges, 1985-; Binney, James, 1950-; Gilmore, Gerry, 1951-; Wyse, Rosemary F. G.; Belokurov, Vasily; McMillan, Paul J.; Hatfield, Peter; Grebel, Eva K.; Steinmetz, Matthias, 1966-; Navarro, Julio F. (Julio Fernando); Seabroke, George; Minchev, Ivan (Mathematics professor); Chiappini, Cristina; Bienaymé, Olivier; Bland-Hawthorn, J. (Joss); Freeman, Ken, 1940-; Gibson, Brad K.; Helmi, A. (Amina), 1970-; Munari, Ulisse; Parker, Quentin A.; Reid, Warren A. (Warren Alfred); Siebert, Arnaud, 1974-; Siviero, Alessandro; Zwitter, Tomaž

Galaxy : abundances; Galaxy : disc; Galaxy : evolution; Galaxy : kinematics and dynamics; Galaxy : stellar content
2015

Journal article


Rights
© 2015 The Authors
Abstract

Using the RAdial Velocity Experiment fourth data release (RAVE DR4), and a new metallicity calibration that will be also taken into account in the future RAVE DR5, we investigate the existence and the properties of supersolar metallicity stars ([M/H] ≳ +0.1 dex) in the sample, and in particular in the solar neighbourhood. We find that RAVE is rich in supersolar metallicity stars, and that the local metallicity distribution function declines remarkably slowly up to +0.4 dex. Our results show that the kinematics and height distributions of the supersolar metallicity stars are identical to those of the [M/H] ≲ 0 thin-disc giants that we presume were locally manufactured. The eccentricities of the supersolar metallicity stars indicate that half of them are on a roughly circular orbit (e ≤ 0.15), so under the assumption that the metallicity of the interstellar medium at a given radius never decreases with time, they must have increased their angular momenta by scattering at corotation resonances of spiral arms from regions far inside the solar annulus. The likelihood that a star will migrate radially does not seem to decrease significantly with increasing amplitude of vertical oscillations within range of oscillation amplitudes encountered in the disc.

Publisher
The University of Hull
Peer reviewed
Yes
Language
English
Extent
770 KB
Identifier
hull:12797

Journal

Journal title
Monthly notices of the Royal Astronomical Society
Publication date
2015
Publisher
Oxford University Press
DOI
10.1093/mnras/stu2726
ISSN (Print)
0035-8711
ISSN (Electronic)
1365-2966
Volume
447
Issue
4
Start page
3526
End page
3535
Notes

This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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