The Wolf-Rayet stellar populations in low-metallicity star-forming galaxies

Details The Wolf-Rayet stellar populations in low-metallicity star-forming galaxies The Wolf-Rayet stellar populations in low-metallicity star-forming galaxies

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003noao.prop...91i&link_type=abstract

NOAO Proposal ID #2003A-0091

Computer Science

Scientific paper

We propose to obtain high signal-to-noise ratio spectrophotometric observations of 10 metal-deficient Wolf-Rayet (WR) galaxies in the wavelength range (lambda)4000-6200Å. Our main aim is the determination of the very poorly known properties of WR stars in the low- metallicity regime, with oxygen abundances in the range 12+log O/H=7.16 - 8.09. This metallicity range cannot be explored with Local Group galaxies. We will measure the intensities of the broad WR emission lines associated with WR stars of different types. The data will be used to derive the relative numbers of WR-to-O stars, compare them with predictions of population synthesis models and put constraints on massive star evolution models at low metallicities. The proposed study will have implications on the analysis of the properties of low- metallicity massive stellar populations in the integrated spectra of distant high-redshift galaxies.

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