| Wolf-Rayet | has emission line He I, He II |  |
| has ejection velocity 2000 km s-1 | |
| has temperature up to 50000 K | |
| has definition Hot stars characterized by wide emission lines of highly ionized elements, standing out distinctly from the continuous spectrum. There exist three varieties: WN, WC and WO | |
| has definition 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.) | |
| is a kind of early star | |
| is a kind of emission line star | |
| early star | has spectral type O, B, A, and early F | |
| star | has star surface temperature | |
| has V magnitude | |
| has B magnitude | |
| has U magnitude | |
| has position on celestial sphere from the point of view of Earth | |
| has parallax from the point of view of Earth's orbit | |
| has proper motion | |
| has radiation at surface which is diffused out from the hotter core | |
| has energy source gravitational contraction and or fusion | |
| has energy production which takes place primarily within the core | |
| has surface density which depends on luminosity class | |
| has surface temperature greater than 1000 Kelvin | |
| has apparent magnitude | |
| has absolute magnitude | |
| has age | |
| has catalog star catalog | |
| has material hydrogen, helium | |
| has velocity determined from proper motion and radial velocity | |
| has mass greater than 0.08 the sun's mass | |
| celestial body | has spectra | |
| physical object | has location or center of gravity | |
| has angular momentum | |
| has momentum | |
| has volume | |
| has extent | |
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