Astronomy   View all facts   Glossary   Help

physical object > natural object > celestial body > star > emission line star > P Cygni star

P Cygni star
subject			fact

P Cygni star	has prototype P Cygni
	has definition A type of star whose spectrum shows strong emission lines, like those of the Be and Wolf-Rayet stars, with blueshifted absorption components which are presumed to come from an expanding shell of low-density matter. A P Cygni profile is taken as an indication of mass loss.
	has definition High-luminosity, early-type star, in which all lines have a P Cyg type profile (an emission component on the red side of the absorption line).
	is a kind of emission line star
emission line star	has emission line
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 P Cygni star :

• P Cygni (5 facts)

Next emission line star: shell star    Up: emission line star    Previous emission line star: Of star