2007A&A...467..123B


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.07CEST17:22:32

2007A&A...467..123B - Astronomy and Astrophysics, volume 467, 123-136 (2007/5-3)

Formation and evolution of the Galactic bulge: constraints from stellar abundances.

BALLERO S.K., MATTEUCCI F., ORIGLIA L. and RICH R.M.

Abstract (from CDS):

We compute the chemical evolution of the Galactic bulge in the context of an inside-out model for the formation of the Milky Way. The model contains updated stellar yields from massive stars. The main purpose of the paper is to compare the predictions of this model with new observations of chemical abundance ratios and metallicity distributions in order to put constraints on the formation and evolution of the bulge. We computed the evolution of several α-elements and Fe and performed several tests by varying different parameters such as star formation efficiency, slope of the initial mass function and infall timescale. We also tested the effect of adopting a primary nitrogen contribution from massive stars. The [α/Fe] abundance ratios in the Bulge are predicted to be supersolar for a very large range in [Fe/H], each element having a different slope. These predictions are in very good agreement with most recent accurate abundance determinations. We also find a good fit of the most recent Bulge stellar metallicity distributions. We conclude that the Bulge formed on a very short timescale (even though timescales much shorter than ∼0.1Gyr are excluded) with a quite high star formation efficiency of ν≃20Gyr–1 and with an initial mass function more skewed toward high masses (i.e.x≤0.95) than the solar neighbourhood and rest of the disk. The results obtained here are more robust than previous ones since they are based on very accurate abundance measurements.

Abstract Copyright:

Journal keyword(s): Galaxy: bulge - Galaxy: evolution - Galaxy: abundances - Galaxy: formation

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10949 1
2 NGC 6342 GlC 17 21 10.14 -19 35 14.7   11.25 10.01     ~ 246 0
3 GCl 66.1 GlC 17 30 38.90 -31 35 44.0           ~ 97 0
4 C 1730-333 GlC 17 33 24.50 -33 23 20.0           ~ 208 2
5 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11613 0
6 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 631 0
7 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 697 1
8 NAME Baade Window reg 18 03.5 -30 01           ~ 532 3
9 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 466 0
10 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 536 0
11 NAME Galactic Bulge reg ~ ~           ~ 3412 0
12 NAME Galactic Bar reg ~ ~           ~ 901 0

    Equat.    Gal    SGal    Ecl

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2020.08.07-17:22:32

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