Local stellar kinematics from RAVE data - II. Radial metallicity gradient

被引：42

作者：

Coskunoglu, B. ^{[1
]}

Ak, S. ^{[1
]}

Bilir, S. ^{[1
]}

Karaali, S. ^{[1
]}

Onal, O. ^{[1
]}

Yaz, E. ^{[1
]}

Gilmore, G. ^{[2
,3
]}

Seabroke, G. M. ^{[4
]}

机构：

[1] Istanbul Univ, Fac Sci, Dept Astron & Space Sci, TR-34119 Univ Istanbul, Turkey

[2] Inst Astron, Cambridge CB3 OHA, England

[3] King Abdulaziz Univ, Fac Sci, Astron Dept, Jeddah 21589, Saudi Arabia

[4] Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2012年 / 419卷 / 04期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

stars: abundances; Galaxy: abundances; Galaxy: disc; Galaxy: evolution; VELOCITY EXPERIMENT RAVE; ELEMENTAL ABUNDANCE RATIOS; OUTER GALACTIC DISK; FIELD STAR SURVEY; MILKY-WAY; SOLAR NEIGHBORHOOD; DATA RELEASE; CHEMICAL EVOLUTION; SPACE VELOCITIES; THICK DISKS;

D O I：

10.1111/j.1365-2966.2011.19925.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：2844 / 2854

页数：11

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