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physical object > natural object > celestial body > star > supergiant

supergiant
subject			fact

supergiant	has luminosity class I
	has definition An extremely luminous star of large diameter and low density. No supergiants are near enough to establish a trigonometric parallax.
	is a kind of star
star	has star surface temperature
	has spectral type
	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 temperature
	has volume
	has extent

Kinds of supergiant :

• Alpha Persei (10 facts) (HR 1017)
• Beta Arae (10 facts) (HR 6461)
• blue supergiant (2 kinds, 25 facts) - A supergiant star with spectral type O or B. All blue supergiants are hot and young. Rigel, in the constellation Orion, is the best example.
• Canopus (14 facts) (alpha Car, HR 2326) - A supergiant, the second brightest star in the southern sky.
• Epsilon Pegasi (10 facts) (HR 8308)
• Polaris (20 facts) (HR 424, Pole star, North Star) - A supergiant F8 Ib, F3 V visual binary, with an orbital period of thousands of years. The primary (a Cepheid with a pulsation period of 3.97 days) is itself a single-lined spectroscopic double with a period of 29.6 years. There are at least two more faint (12th mag) components of the system.
• post-asymptotic branch star (3 facts) - F-type supergiant with strong sulfur lines.
• R Coronae Borealis variable (1 kind, 17 facts) - A very luminous helium-rich, carbon-rich, hydrogen-poor eruptive variable supergiant whose light declines up to 8 magnitudes at irregular intervals.
• red supergiant (2 kinds, 23 facts) - A supergiant with spectral type M. Red supergiants are the largest stars in the universe: if put in place of the Sun, some would touch Saturn. The two brightest red supergiants in Earth's sky are Betelgeuse and Antares.
• Vela X-1 (11 facts) (HD 77581, 3U 0900-40)
• yellow supergiant (2 kinds, 21 facts) - A supergiant star with a spectral type of G.

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