C.D.S. - SIMBAD4 rel 1.7 - 2021.03.09CET10:00:18

2009A&A...498...95V - Astronomy and Astrophysics, volume 498, 95-107 (2009/4-4)

Stellar populations in the Galactic bulge. Modelling the galactic bulge with TRILEGAL.


Abstract (from CDS):

The aim of this paper is to study the characteristics of the stellar populations and the metallicity distribution in the Galactic bulge. We study the entire stellar population, but also retrieve information using only the red clump stars. To study the characteristics of the stellar populations and the metallicity distribution in the Galactic bulge, we compared the output of the galaxy model TRILEGAL, which implements the Binney et al. (1997MNRAS.288..365B) bulge model, with observations from 2MASS and OGLE-II. A minimisation procedure has been set up to retrieve the best fitting model with different stellar populations and metallicity distributions. Using the TRILEGAL code we find that the best model resembling the characteristics of the Galactic bulge is a model with the distance to the Galactic centre R0=8.7+0.57–0.43kpc, the major axis ratios of the bar 1:η:ζ=1:0.68+0.05–0.19:0.31+0.06–0.04, and the angle between the Sun-centre line and the bar φ= 15°+13.3–12.7. Using these parameters the best model is found for a burst of 8Gyr, although it is almost indistinguishable from models with ages of 9 and 10Gyr. The metallicity distribution found is consistent with metallicity distributions in the literature based on spectroscopic results.

Abstract Copyright:

Journal keyword(s): Galaxy: bulge - Galaxy: structure - stars: distances - Galaxy: fundamental parameters - stars: Hertzsprung Russell (HR) and C-M diagrams

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15216 1
2 GAL 000.0+00.0 gam 17 45 39.60213 -29 00 22.0000           ~ 12015 0
3 NAME Baade Window reg 18 03.5 -30 01           ~ 549 3
4 NAME Galactic Bulge reg ~ ~           ~ 3536 0

    Equat.    Gal    SGal    Ecl

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