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pulsar (PSR)
subject			fact

pulsar	has acronym PSR
	has definition A fast-spinning neutron star that emits radiation toward Earth every-time it rotates.
	has definition Neutron stars that spin rapidly and have strong magnetic fields, which produce electromagnetic radiation. (See neutron star.)
	has definition An object discovered at Cambridge University in 1967 which has the mass of a star and a radius no larger than that of Earth and which emits radio pulses with a very high degree of regularity (periods range from 0.03 s for the youngest to more than 3 s for the oldest). All pulsars are characterized by the general properties of dispersion, periodicity, and short duty cycle. Pulsars are believed to be rotating, magnetic (surface magnetic fields of 1010 to 1014 gauss are estimated) neutron stars which are the end products of supernovae. Type S pulsars have a simple pulse shape: Type C, complex: Type D have drifting subpulses.
	is a kind of neutron star
	is a kind of radio 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
massive compact halo object	is a part of halo
celestial body	has spectra
dark matter	is a part of dark halo
	has synonym hidden mass
hypothetical particle	has acceptance status hypothetical
physical object	has location or center of gravity
	has angular momentum
	has momentum
	has temperature
	has volume
	has extent
particle	obeys uncertainty principle
	has frequency inversely proportional to the wavelength
	has wavelength inversely proportional to its momentum
	has charge

Kinds of pulsar :

• binary pulsar (1 kind, 7 facts)
• Crab pulsar (7 facts) (NP 0532) - A pulsar associated with the Crab Nebula. It has the shortest period of any known pulsar.
• PSR B 1257+12 (2 facts) - A pulsar in the constellation Virgo and the site of the first solar system to be discovered outside our own. The planets were detected in 1991.
• Vela pulsar (6 facts) (PSR 0833-45, Vela X) - A compact radio source about 400-500 pc distant associated with the Vela supernova remnant (q.v.). It has a nonthermal radio spectrum and is about 20 percent polarized. It is associated with the Gum Nebula, the Vela pulsar, and the X-ray source 2U 0832-45, although the pulsar and the X-ray source are displaced about 0°.7 from the center of the Vela X radio emission. Vela Y and Vela Z are outlying components, also nonthermal, but too weak to exhibit polarization., A pulsar about 400-500 pc distant, probably associated with the Vela supernova remnant. Period 0.0892 seconds.
• X-ray pulsar (2 kinds, 22 facts) - Pulsar (q.v.) that radiates in the X-ray region of the spectrum. Best verified examples are Her X-1 and Cen X-3. They are thought to be rotating, strongly magnetic neutron stars of about 1 M_sun in a grazing orbit around a more massive star from which they are accreting matter.

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