- #1
wolram
Gold Member
Dearly Missed
- 4,446
- 558
From Wiki.
The pulsar and its neutron star companion both follow elliptical orbits around their common center of mass. The period of the orbital motion is 7.75 hours, and the two neutron stars are believed to be nearly equal in mass, about 1.4 solar masses. Radio emissions have been detected from only one of the two neutron stars.
The minimum separation at periastron is about 1.1 solar radii; the maximum separation at apastron is 4.8 solar radii. The orbit is inclined at about 45 degrees with respect to the plane of the sky. The orientation of periastron changes by about 4.2 degrees per year in direction of the orbital motion (relativistic precession of periastron). In January 1975, it was oriented so that periastron occurred perpendicular to the line of sight from Earth.[2] [5]
The orbit has decayed since the binary system was initially discovered, in precise agreement with the loss of energy due to gravitational waves predicted by Einstein's general theory of relativity.[2][5][6][7] The ratio of observed to predicted rate of orbital decay to be 0.997±0.002.[7] The total power of the gravitational radiation (waves) emitted by this system presently, is calculated to be 7.35 × 1024 watts. For comparison, this is 1.9% of the power radiated in light by our own Sun. (Another comparison is that our own Solar System radiates only about 5000 watts in gravitational waves, due to the much larger distances and orbit times, particularly between the Sun and Jupiter).
With this comparatively large energy loss due to gravitational radiation, the rate of decrease of orbital period is 76.5 microseconds per year, the rate of decrease of semimajor axis is 3.5 meters per year, and the calculated lifetime to final inspiral is 300,000,000 years.[2] [7]
Mass of companion: 1.387 MSun
Orbital period: –7.751939106 hr
Eccentricity: –0.617131
Semimajor axis: 1,950,100 km
Periastron separation: 746,600 km
Apastron separation: 3,153,600 km
Orbital velocity of stars at periastron (relative to center of mass): 450 km/s
Orbital velocity of stars at apastron (relative to center of mass): 110 km/s
In 2004, Taylor and Joel M. Weisberg published a new analysis of the experimental data to date, concluding that the 0.2% disparity between the data and the predicted results is due to poorly known galactic constants, and that tighter bounds will be difficult to attain with current knowledge of these figures. They also mapped the pulsar's two-dimensional beam structure using the fact that the system's precession leads to varying pulse shapes. They found that the beam shape is latitudinally elongated, and pinched longitudinally near the centre, leading to an overall figure-of-eight shape.[3]
From this i am trying to understand what is being converted into gravity waves, is it angular momentum, mass, or what.
In a binary system how would one calculate which one would inspiral into the other.
And how many watts per year for say a binary system of 1.5 solar masses each would be given off before coalition. given some arbitrary orbit.
The pulsar and its neutron star companion both follow elliptical orbits around their common center of mass. The period of the orbital motion is 7.75 hours, and the two neutron stars are believed to be nearly equal in mass, about 1.4 solar masses. Radio emissions have been detected from only one of the two neutron stars.
The minimum separation at periastron is about 1.1 solar radii; the maximum separation at apastron is 4.8 solar radii. The orbit is inclined at about 45 degrees with respect to the plane of the sky. The orientation of periastron changes by about 4.2 degrees per year in direction of the orbital motion (relativistic precession of periastron). In January 1975, it was oriented so that periastron occurred perpendicular to the line of sight from Earth.[2] [5]
The orbit has decayed since the binary system was initially discovered, in precise agreement with the loss of energy due to gravitational waves predicted by Einstein's general theory of relativity.[2][5][6][7] The ratio of observed to predicted rate of orbital decay to be 0.997±0.002.[7] The total power of the gravitational radiation (waves) emitted by this system presently, is calculated to be 7.35 × 1024 watts. For comparison, this is 1.9% of the power radiated in light by our own Sun. (Another comparison is that our own Solar System radiates only about 5000 watts in gravitational waves, due to the much larger distances and orbit times, particularly between the Sun and Jupiter).
With this comparatively large energy loss due to gravitational radiation, the rate of decrease of orbital period is 76.5 microseconds per year, the rate of decrease of semimajor axis is 3.5 meters per year, and the calculated lifetime to final inspiral is 300,000,000 years.[2] [7]
Mass of companion: 1.387 MSun
Orbital period: –7.751939106 hr
Eccentricity: –0.617131
Semimajor axis: 1,950,100 km
Periastron separation: 746,600 km
Apastron separation: 3,153,600 km
Orbital velocity of stars at periastron (relative to center of mass): 450 km/s
Orbital velocity of stars at apastron (relative to center of mass): 110 km/s
In 2004, Taylor and Joel M. Weisberg published a new analysis of the experimental data to date, concluding that the 0.2% disparity between the data and the predicted results is due to poorly known galactic constants, and that tighter bounds will be difficult to attain with current knowledge of these figures. They also mapped the pulsar's two-dimensional beam structure using the fact that the system's precession leads to varying pulse shapes. They found that the beam shape is latitudinally elongated, and pinched longitudinally near the centre, leading to an overall figure-of-eight shape.[3]
From this i am trying to understand what is being converted into gravity waves, is it angular momentum, mass, or what.
In a binary system how would one calculate which one would inspiral into the other.
And how many watts per year for say a binary system of 1.5 solar masses each would be given off before coalition. given some arbitrary orbit.
