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| Paper: |
Photometric Constraints on Chemical Evolution Models of Irregular Galaxies |
| Volume: |
230, Galaxy Disks and Disk Galaxies |
| Page: |
349 |
| Authors: |
Carigi, L.; Bruzual, G. |
| Abstract: |
The photometric properties of stellar populations that evolve according to chemical evolution models developed by Carigi, Colin & Peimbert (1999) and Carigi & Peimbert (2001) are explored. The models explain the oxygen abundance and gas mass fraction of the irregular galaxies NGC 1560, I Zw 18, NGC 2366, and a typical irregular galaxy. The photometric predictions narrow down the range of possible chemical evolution models. The observed colors of I Zw 18 require an age of 108 - 109 yr for its dominant population, while an older age of 109 - 1010 yr is preferred for the rest of the galaxy sample. The observed colors are in general, within errors, close to the predicted ones. There is a tendency for the observed (B-V) color to imply higher metallicities at a fixed age than (U-B) (equivalently, (U-B) implies younger ages than (B-V)). |
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