AAS 204th Meeting, June 2004
Session 40 Galaxies
Poster, Tuesday, June 1, 2004, 10:00am-7:00pm, Ballroom

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[40.24] The Wolf-Rayet Population of High-Metalicity Starburst Galaxies

J. R. S. Leao, C. Leitherer (STScI), F. Bresolin (University of Hawaii), R. R. Lacerda, R. Cid Fernandes (Universidade Federal de Santa Catarina)

We present early results of the stellar population analysis of a sample of 4 high metalicity Starburst galaxies. The galaxies were observed in the optical using Keck/LRIS and in the IR using UKIRT/UIST. The optical spectra cover the wavelength range 3000 - 7000 Angstrons while the IR spectra cover the range 1.4 - 2.5 micrometers.

Some of the galaxies show a very clear Wolf-Rayet bump around 4686 Angstrons (He II) indicating the presence of Wolf-Rayet stars. A comparison between the optical and IR spectra and an estimation of the ionizing output are presented.

By using a stellar population synthesis code that we developed we were able to subtract the underlying older stellar population from our galaxies. The resulting spectra are dominated by a pure young-age (10Gyr) stellar component. In these spectra the Wolf-Rayet features are even more pronounced than in the composite (Young + old population) spectra which showed a diluted evidence of the Wolf-Rayet feature.

The synthesis also provides a good estimate of the relative importance of the young, intermediate and old stellar populations components to the integrated observed spectra.

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