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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Chemical evolution of the bulge of M31: predictions about abundance ratios

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Author(s):
Marcon-Uchida, M. M. [1] ; Matteucci, F. [2, 3, 4] ; Lanfranchi, G. A. [1] ; Spitoni, E. [2] ; Grieco, V. [2]
Total Authors: 5
Affiliation:
[1] Univ Cruzeiro Sul, Nucleo Astrofis Teor, BR-01506000 Sao Paulo - Brazil
[2] Univ Trieste, Dipartimento Fis, Sez Astron, I-34131 Trieste - Italy
[3] INAF Trieste, I-34131 Trieste - Italy
[4] INFN Trieste, I-34134 Trieste - Italy
Total Affiliations: 4
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 447, n. 2, p. 1096-1102, FEB 21 2015.
Web of Science Citations: 0
Abstract

We aim to reproduce the chemical evolution of the bulge of M31 using a detailed chemical evolution model, including radial gas flows coming from the disc. We study the impact of the initial mass function, the star formation rate and the time-scale for bulge formation on the metallicity distribution function of stars. We compute several models of chemical evolution using the metallicity distribution of dwarf stars as an observational constraint for the bulge of M31. Then, using the model that best reproduces the metallicity distribution function, we predict the {[}X/Fe] versus {[}Fe/H] relations for several chemical elements (O, Mg, Si, Ca, C, N). Our best model for the bulge of M31 is obtained by using a robust statistical method and assumes a Salpeter initial mass function, a Schmidt-Kennicutt law for star formation with an exponent k = 1.5, an efficiency of star formation of similar to 15 +/- 0.27 Gyr(-1) and an infall time-scale of similar to 0.10 +/- 0.03 Gyr. Our results suggest that the bulge of M31 formed very quickly as a result of an intense star formation rate and an initial mass function flatter than in the solar vicinity but similar to that inferred for the Milky Way bulge. The {[}alpha/Fe] ratios in the stars of the bulge of M31 should be high for most of the {[}Fe/H] range, as observed in the Milky Way bulge. These predictions await future data to be proven. (AU)

FAPESP's process: 10/17142-4 - Chemical evolution of nearby spiral galaxies
Grantee:Monica Midori Marcon Uchida Sguazzardi
Support Opportunities: Scholarships in Brazil - Post-Doctoral