A sample of Wolf-Rayet galaxies from the Sloan Digital Sky Survey
Heading:
| 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 |
Abstract: 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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