Star formation histories of local group dwarf galaxies |
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| Authors: | Chisato Ikuta Nobuo Arimoto Pascale Jablonka |
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| Affiliation: | (1) JSPS fellow, School of Physics & Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, U.K.;(2) National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;(3) DAEC-URA 8631, Observatoire de Paris-Meudon, Place Jules Janssen, F-92195 Meudon, France |
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| Abstract: | We present the study of the star formation histories (SFHs) of a sample of Local Group dwarf galaxies (LGDGs), via the analysis and modelling, with the means of an evolutionary stellar population synthesis, of their colour-magnitude (CM) diagrams. It appears that important parameters to describe the SFHs are star formation rate (SFR) and duration of star formation. We find a possible correlation between the mass and the SFRs. The correlation might be the origin of the observed luminosity-metallicity relation in the LGDGs. A well-defined correlation between the durations of star formation and the distance from M31 or the Galaxy indicates that the current early-type dwarf galaxies should have been transformed from late-type by strong tidal force of the massive galaxies. This revised version was published online in August 2006 with corrections to the Cover Date. |
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