Bilir, S;
Karaali, S;
Ak, S;
Onal, O;
Dagtekin, ND;
Yontan, T;
Gilmore, G;
(2012)
Local stellar kinematics from RAVE data - III. Radial and vertical metallicity gradients based on red clump stars.
Monthly Notices of the Royal Astronomical Society
, 421
(4)
pp. 3362-3374.
10.1111/j.1365-2966.2012.20561.x.
Preview |
Text
Seabroke_mnras0421-3362.pdf - Published Version Download (5MB) | Preview |
Abstract
We investigate radial and vertical metallicity gradients for a sample of red clump stars from the RAdial Velocity Experiment (RAVE) Data Release 3. We select a total of 6781 stars, using a selection of colour, surface gravity and uncertainty in the derived space motion, and calculate for each star a probabilistic (kinematic) population assignment to a thin or thick disc using space motion and additionally another (dynamical) assignment using stellar vertical orbital eccentricity. We derive almost equal metallicity gradients as a function of the Galactocentric distance for the high‐probability thin‐disc stars and for stars with vertical orbital eccentricities consistent with being dynamically young, ev≤ 0.07, i.e. d[M/H]/dRm=−0.041 ± 0.003 and d[M/H]/dRm=−0.041 ± 0.007 dex kpc−1. Metallicity gradients as a function of the distance from the Galactic plane for the same populations are steeper, i.e. d[M/H]/dzmax=−0.109 ± 0.008 and d[M/H]/dzmax=−0.260 ± 0.031 dex kpc−1, respectively. Rm and zmax are the arithmetic mean of the perigalactic and apogalactic distances, and the maximum distance to the Galactic plane, respectively. Samples including more thick‐disc red clump giant stars show systematically shallower abundance gradients. These findings can be used to distinguish between different formation scenarios of the thick and thin discs.
| Type: | Article |
|---|---|
| Title: | Local stellar kinematics from RAVE data - III. Radial and vertical metallicity gradients based on red clump stars |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1111/j.1365-2966.2012.20561.x |
| Publisher version: | https://doi.org/10.1111/j.1365-2966.2012.20561.x |
| 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: | stars: abundances, Galaxy: abundances, Galaxy: disc, Galaxy: evolution |
| 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/10090648 |
Archive Staff Only
 |
View Item |
