Chemical evolution of dwarf spheroidal galaxies

Details Chemical evolution of dwarf spheroidal galaxies Chemical evolution of dwarf spheroidal galaxies

Publishing date

Aug 2003

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23...19l&link_type=abstract

Journals

Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 19-19

Science

Astronomy and Astrophysics

Field

Astronomy

Type

Scientific paper

Abstract

We will present the results of a study of the star formation and chemical evolution in a sample of 8 Dwarf Spheroidal (dSph) galaxies of the Local Group made through comparisons between the predictions of chemical evolution models and several observed abundance ratios. Detailed models with up to date nucleosynthesis taking into account the role played by supernovae of different types (II, Ia) were developed for this type of galaxy allowing us to follow the evolution of several chemical elements (H, D, He, C, N, O, Mg, Si, S, Ca, and Fe). The models are specified by the prescriptions of the star formation and galactic wind efficiencies chosen to reproduce the main features of these galaxies, i.e. one or two long episodes of activity and a very efficient wind. We also compared the predictions of the models to the abundance ratios observed in Damped Lyman a Systems (DLAs). The main conclusions are: i) the observed distribution of [a/Fe] vs. [Fe/H] in dSph galaxies is mainly an effect of the star formation rate coupled with the wind efficiency; ii) a low star formation efficiency (n = 0.01-1 Gyr-1) and a high wind efficiency (wi = 10-13 Gyr-1) are required to reproduce the observational data for dSph galaxies; iii) the low gas content of these galaxies is the result of the combined action of gas consumption by star formation and gas removal by galactic winds; vii) the models for the dSph galaxies reproduce the abundance ratios observed in DLAs at early stages of chemical evolution.

Affiliated with

Also associated with

No associations

Rating

Chemical evolution of dwarf spheroidal galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Chemical evolution of dwarf spheroidal galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chemical evolution of dwarf spheroidal galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1665199