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physical object > natural object > celestial body > star > early star > Wolf-Rayet > [WR] star

[WR] star
subject			fact

[WR] star	has definition WR star that is the central object of a planetary nebula.
	is a kind of Wolf-Rayet
Wolf-Rayet	has emission line He I, He II
	has ejection velocity 2000 km s-1
	has temperature up to 50000 K
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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