期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 419, 期 4, 页码 2844-2854出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2011.19925.x
关键词
stars: abundances; Galaxy: abundances; Galaxy: disc; Galaxy: evolution
资金
- Scientific and Technological Research Council (TUBITAK) [108T613]
- UK VEGA
- National Aeronautics and Space Administration
- National Science Foundation
- Science and Technology Facilities Council [ST/J001538/1, ST/H00243X/1] Funding Source: researchfish
- UK Space Agency [ST/I000852/1, ST/K00056X/1, PP/D006570/1] Funding Source: researchfish
- STFC [ST/J001538/1] Funding Source: UKRI
We investigate radial metallicity gradients for a sample of dwarf stars from the RAdial Velocity Experiment (RAVE) Data Release 3 (DR3). We select a total of approximately 17 000 F-type and G-type dwarfs, using a selection of colour, log g and uncertainty in the derived space motion, and calculate for each star a probabilistic (kinematic) population assignment to a thick or thin disc using space motion and additionally another (dynamical) assignment using stellar vertical orbital eccentricity. We additionally subsample by colour, to provide samples biased toward young thin-disc and older thin-disc stars. We derive a metallicity gradient as a function of Galactocentric radial distance, i.e. d[M/H]/dRm=-0.051 +/- 0.005 dex kpc-1, for the youngest sample, F-type stars with vertical orbital eccentricities e(v) <= 0.04. Samples biased toward older thin-disc stars show systematically shallower abundance gradients.
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