Compact stars and pulsars
Compact stars
The Crab Nebula, the remains of a star which went supernova in AD 1054. A powerful radio pulsar lies near the centre of the nebula.
Compact stars as the endpoint of stellar evolution
Compact stars last forever
Thought experiment in building compact objects ...
In general, compact stars of less than 1.44 solar masses, the Chandrasekhar limit, are white dwarfs; above 2 to 3 solar masses (the Tolman-Oppenheimer-Volkoff limit), a Quark star might be created, however this is uncertain.
COMPACT STAR
Compact stars are very dense stars with a radius much smaller than than the our Sun. Some compact stars include black holes, white dwarfs, and neutron stars.
For compact stars like white dwarfs and neutron stars an increase in the mass results in a decrease in radius. This means increasing the mass of such a star will lead to a big increase in escape speed.
You've just found the "heart" of the Hydra. To find its head, look for the compact stars to the northwest. It is easiest to do this with the naked eye, or with binoculars. These stars are not quite as far north as Regulus.
Giant stars have a much lower surface gravity than main sequence stars, while the opposite is the case for degenerate, compact stars such as white dwarfs.
It was predicted by Albert Einstein with his general relativity theory -- According to which periodic processes are slowed down in a gravitational field. This Einstein Shift is noticeable in the spectra of massive, compact stars, ...
In the case of compact stars embedded in the winds from companion stars, magnetospheres similar to that of the Earth are set up.
It is now known that such x-ray sources are compact stars, such as neutron stars and black holes. The energy source is gravitational energy, which comes from gas heated by the fall in the strong gravitational field of such objects.
 See also: Dwarf, Star, Time, Gravitation, White Dwarf
  
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