|
A pulsar, which originally standed for pulsating radiosource, is a rapidly rotating neutron star, whose electromagnetic radiation is observed in regularly spaced interval, or pulses. |
|
A pulsar, which originally stood for pulsating radiosource, is a rapidly rotating neutron star, whose electromagnetic radiation is observed in regularly spaced interval, or pulses. |
|
on 1967. They were using a radio array to study the scintillation |
|
in 1967. They were using a radio array to study the scintillation |
|
the signal was ruled out by the time it took the object to reappear, a [sidereal day]? instead of a [solar day]?. |
|
the signal was ruled out because the time it took the object to reappear was a [sidereal day]? instead of a [solar day]?. |
|
a neutron star, a kind of object up to then only hypotesized. |
|
a neutron star, a kind of object up to then only hypothesized. |
|
In the 80's a new discovering was made, of millisecond pulsars, that, as their name indicates, instead of having periods of a few seconds, ahve periods of a few milliseconds. |
|
In the 80's a new discovery was made, the millisecond pulsars, that, as their name indicates, instead of having periods of a few seconds, have periods of a few milliseconds. |
|
system. The high precision of the measurements allowed astronomers to calculate the loss of orbital energy of the system, that is thought to be emitted as [gravitational wave]?s. |
|
system. The high precision of the measurements allowed astronomers to calculate the loss of orbital energy of the system, which is thought to be emitted as [gravitational wave]?s. |
|
axis of the magnetic field of the star. The source of energy of the beam is the rotational energy of the neutron star, that slows down. |
|
axis of the magnetic field of the star; the beam is emitted from the poles of the neutron star's magentic field, which may be offset from the rotational poles by a wide angle. The source of energy of the magnetic field is the rotational energy of the neutron star, which is slowing down. Millisecond pulsars are thought to have been spun up to high rotational speed by infalling matter pulled off of a companion star. |
|
of the neutron star. This velocity is slowing down steadily, except by sudden by sudden variations |
|
of the neutron star. This velocity is slowing down steadily, except by sudden variations. These were for a time believed to be "starquakes" due to the adjustment of the crust of the neutron star. Models where the glitch is due to a decoupling of the possibly superconducting interior of the star have also been advanced. Importance As mentioned above, the discovery of pulsars allowed astronomers to study an object never observed before, the neutron star. This kind of object is the only place where the behaviour of matter at nuclear density can be observed (though not directly). Also, millisecond pulsars have allowed one test of general relativity in conditions of an intense gravitational field. /Talk? |
![[Home]](wikipedia.png)