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Star formation histories in dwarf irregular galaxies in the Local Group

Published online by Cambridge University Press:  19 July 2016

L. Greggio ,
G. Marconi ,
P. Focardi  and
M. Tosi
L. Greggio
Affiliation:
Astronomy Department, University of Bologna, CP 596, I-40100 Bologna, Italy
G. Marconi
Affiliation:
Astronomy Department, University of Bologna, CP 596, I-40100 Bologna, Italy
P. Focardi
Affiliation:
Astronomy Department, University of Bologna, CP 596, I-40100 Bologna, Italy
M. Tosi
Affiliation:
Astronomical Observatory of Bologna, Via Zamboni 33, I-40100 Bologna, Italy

Abstract

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The process of star formation (SF) and the modalities with which it occurs in galaxies of different sizes are still poorly understood. On the other hand, interpretation of the chemical and photometric properties of galaxies requires the adoption of adequate laws for the SF rate and Initial Mass Function (IMF) in model computations. Dwarf irregular galaxies in the Local Group offer the chance to study their SF history through analysis of their HR diagrams, which can be derived down to V 25, corresponding to MV0, i.e. to main sequence stars of 2 M⊙. Therefore, for these galaxies, we can derive information on the star formation activity which has occurred over the last 1 Gyr approximately. In this framework, we have undertaken CCD observations of Dwarf irregular galaxies in the Local Group with ESO telescopes and briefly present here the results obtained for DDO 210, Sextans B and NGC 3109.

Type
Stellar Evolution
Information
Symposium - International Astronomical Union , Volume 148: The Magellanic Clouds , 1991 , pp. 343 - 344
Copyright
Copyright © Kluwer 1991 

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