Optical spectrophotometry of Wolf-Rayet galaxies

Details Optical spectrophotometry of Wolf-Rayet galaxies Optical spectrophotometry of Wolf-Rayet galaxies

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401..543v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 2, p. 543-558.

Other

235

Spectrophotometry, Starburst Galaxies, Stellar Composition, Visible Spectrum, Wolf-Rayet Stars, Emission Spectra, Forbidden Transitions, Helium, O Stars

Scientific paper

We have obtained long-slit optical spectra of 10 Wolf-Rayet galaxies and four other starburst galaxies. Using the nebular emission lines we have determined the electron temperatures, electron densities, extinctions, oxygen abundances, mass of ionized hydrogen, and numbers of ionizing photons due to hot stars in these galaxies. The various forbidden line ratios clearly indicate a stellar origin for the emission-line spectrum. From the flux of the broad He II 4686 A emission feature we have estimated the number of Wolf-Rayet stars present. We have accounted for the contribution of these stars to the total ionizing flux and have calculated the ratio of the number of these stars to the number of O stars. Wolf-Rayet galaxies are among the youngest examples of the starburst phenomenon, which we observed at a propitious moment.

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