SIMBAD references

2012MNRAS.421.3362B - Mon. Not. R. Astron. Soc., 421, 3362-3374 (2012/April-3)

Local stellar kinematics from RAVE data – III. Radial and vertical metallicity gradients based on red clump stars.

BILIR S., KARAALI S., AK S., ONAL O., DAGTEKIN N.D., YONTAN T., GILMORE G. and SEABROKE G.M.

Abstract (from CDS):

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. 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, 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.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): stars: abundances - Galaxy: abundances - Galaxy: disc - Galaxy: evolution

VizieR on-line data: <Available at CDS (J/MNRAS/421/3362): table2.dat>

Simbad objects: 6556

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2012MNRAS.421.3362B and select 'bookmark this link' or equivalent in the popup menu


2021.12.08-00:54:48

© Université de Strasbourg/CNRS

    • Contact