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physical object > natural object > celestial body > star > early star > Wolf-Rayet > [WR] star |
[WR] star comparison table |
Subject | is a kind of | has definition |
---|---|---|
Wolf-Rayet | emission line star | One of a class of very luminous, very hot (as high as 50000 K) stars whose spectra have broad emission lines (mainly He I and He II), which are presumed to originate from material ejected from the star at very high (~ 2000 km s-1 ) velocities. Some W-R spectra show emission lines due to carbon (WC stars); others show emission lines due to nitrogen (WN stars). (Hiltner and Schild classification: WN-A, narrow lines; WN-B, broad lines.) |
[WR] star | Wolf-Rayet | WR star that is the central object of a planetary nebula. |
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