Physics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mru..conf..288l&link_type=abstract
The Metal-Rich Universe, The Cambridge Contemporary Physics. Conference Proceedings from The Metal Rich Universe, 2006. Edited
Physics
Massive Stars, Starburst Galaxies, Wolf-Rayet Stars, Population Synthesis, Massive Galaxies, Metal-Rich Galaxies, Star-Forming Galaxies, Spectroscopy
Scientific paper
We conducted an optical survey (Keck Telescope, 3700-7000 A) of 24 high metallicity (Z) starburst galaxies to investigate if high-Z environments favor the formation of Wolf-Rayet (W-R) stars. We searched for the presence of the He II 4686 A line produced by the massive W-R stars. We detected this feature in 6 galaxies of 25% of the sample. We also used a stellar population synthesis code to determine their ages. We find that: (i) All galaxies hosting considerable numbers of W-R stars are very young systems, with ages log(t) < 8 [years]; (ii) Not all young star-forming galaxies host W-R stars, or at least that population cannot be detected in their integrated spectra; (iii) Most galaxies hosting W-R populations are found in interacting systems. We for the first time detect W-R populations in galaxies ESO 485-G003, NGC 6090 and NGC 2798.
Bresolin Fabio
Cid Fernandes Roberto
Leão João Rodrigo S.
Leitherer Cl.
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