C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST05:58:04

2014A&A...571A..59S - Astronomy and Astrophysics, volume 571A, 59-59 (2014/11-1)

RRab Lyrae metallicity gradient in the Galactic bulge.


Abstract (from CDS):

We revisit the presence and significance of the Galactic bulge metallicity gradients, using the OGlE-III RR Lyrae sample. We implemented a Monte Carlo simulation to account for observational uncertainties and systematic errors to test the presence, significance, and spatial variation of RR Lyr photometric metallicity gradients within the Galactic bulge. Furthermore, we take special consideration to identify and account for possible observational and statistical biases, which may introduce an apparent metallicity gradient into the sample. We find a mean Galactic bulge RRab metallicity of -0.97±0.29dex, a global radial metallicity gradient of -0.016±0.008dex/Kpc, and a global vertical metallicity gradient of -0.063±0.013dex/Kpc. Furthermore, neither the global radial nor vertical gradients can be explained by random chance, unjustified extrapolation of the metallicity calibration law, or induced by a Malmquist bias.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: variables: RR Lyrae - Galaxy: bulge - Galaxy: abundances - methods: statistical

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 542 0
2 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1777 2
3 NAME Galactic Bulge reg ~ ~           ~ 3459 0

    Equat.    Gal    SGal    Ecl

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