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white supergiant
subject			fact

white supergiant	has definition A supergiant star with a spectral type of A. White supergiants are rare; the nearest is Deneb, which lies 1500 light-years away.
	is a kind of A star
A star	has color white
	has surface temperature 10000 K
	has absorption line H I
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 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 temperature
	has volume
	has extent

Kinds of white supergiant :

• Deneb (12 facts) (alpha Cyg, HR 7924) - An A2 Ia supergiant at the head of the Northern Cross. Most distant first-magnitude star.
• epsilon Aurigae (7 facts) - An eclipsing binary with an invisible supergiant companion. The primary is an extremely luminous A8 Ia supergiant of 30 M_sun in a post-main-sequence stage of evolution; the secondary may be a collapsed star or black hole. It has at least six components.

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