Kordopatis, G;
Binney, J;
Gilmore, G;
Wyse, RFG;
Belolcurov, V;
McMillan, PJ;
Hatfield, P;
... Zwitter, T; + view all
(2015)
The rich are different: evidence from the RAVE survey for stellar radial migration.
Monthly Notices of the Royal Astronomical Society
, 447
(4)
pp. 3526-3535.
10.1093/mnras/stu2726.
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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.
| Type: | Article |
|---|---|
| Title: | The rich are different: evidence from the RAVE survey for stellar radial migration |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stu2726 |
| Publisher version: | https://doi.org/10.1093/mnras/stu2726 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Galaxy: abundances, Galaxy: disc, Galaxy: evolution, Galaxy: kinematics and dynamics, Galaxy: stellar content |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10076674 |
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