Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:1201.3065)
· On-line Data
· References in the article
· Citations to the Article (27) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (6556)
· Associated Articles
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Local stellar kinematics from RAVE data - III. Radial and vertical metallicity gradients based on red clump stars
Authors:
Bilir, S.; Karaali, S.; Ak, S.; Önal, Ö.; Dagtekin, N. D.; Yontan, T.; Gilmore, G.; Seabroke, G. M.
Affiliation:
AA(Department of Astronomy and Space Sciences, Science Faculty, Istanbul University, 34119, Istanbul, Turkey), AB(Department of Astronomy and Space Sciences, Science Faculty, Istanbul University, 34119, Istanbul, Turkey), AC(Department of Astronomy and Space Sciences, Science Faculty, Istanbul University, 34119, Istanbul, Turkey), AD(Department of Astronomy and Space Sciences, Science Faculty, Istanbul University, 34119, Istanbul, Turkey), AE(Department of Astronomy and Space Sciences, Science Faculty, Istanbul University, 34119, Istanbul, Turkey), AF(Department of Astronomy and Space Sciences, Science Faculty, Istanbul University, 34119, Istanbul, Turkey), AG(Institute of Astronomy, Madingley Road, Cambridge CB3 OHA; Astronomy Department, Faculty of Science, King Abdulaziz University, PO Box 80203, Jeddah 21589, Saudi Arabia), AH(Mullard Space Science Laboratory, University College London, Hombury St Mary, Dorking RH5 6NT)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 421, Issue 4, pp. 3362-3374. (MNRAS Homepage)
Publication Date:
04/2012
Origin:
WILEY
Astronomy Keywords:
stars: abundances, Galaxy: abundances, Galaxy: disc, Galaxy: evolution
Abstract Copyright:
© 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
DOI:
10.1111/j.1365-2966.2012.20561.x
Bibliographic Code:
2012MNRAS.421.3362B

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.

Associated Articles

Part  1     Part  2     Part  3     Part  4     Catalog Description     Part  5    


Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

  New!

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints