A sample of Wolf-Rayet galaxies from the Sloan Digital Sky Survey

1Agiienko, KB, 1Guseva, NG, 1Izotov, YI
1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Kinemat. fiz. nebesnyh tel (Online) 2013, 29(3):48-63
Start Page: Extragalactic Astronomy
Language: Russian

We analysed spectra of Blue Compact Dwarf galaxies from Data Release 7 of the Sloan Digital Sky Survey (SDSS) and created a sample of 271 galaxies with Wolf-Rayet (WR) features in their spectra which are produced by high-velocity stellar winds. The blue WR-feature (bump) is a blend of the emission lines N V λλ 460.5, 462.0 nm, N III λλ 463.4, 464.0 nm, C III λ 465.0 nm, C IV λ 465.8 nm and He II λ 468.6 nm. The red WR-feature (bump) is a broad emission of C IV λ 580.8 nm. Nitrogen WR-stars (WN-stars) are main contributors to the blue bump and carbon WR-stars (WC-stars) contribute to the red bump. The blue bump is presented in all the spectra of our sample and the red bump is seen for 50 % of our spectra. We obtained the number of early-type WC and late-type WN stars from the luminosity of single WC and WN stars of the red and blue bump, respectively. The number of O-stars was derived from the Hβ luminosity. The number ratio of WR stars to all massive stars is decreased with a reduction in metallicity, which is in good agreement with evolution population synthesis models.

Keywords: dwarf galaxies, galaxies Wolf-Rayet, SLOAN

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