Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-08-05
Astronomy and Astrophysics
Astrophysics
Talk presented at the 33rd COSPAR Scientific Assembly, Warsaw, Poland, 16-23 July 2000. Submitted for publication in Advances
Scientific paper
10.1016/S0273-1177(01)00417-3
Before the launch of the Rossi X-ray Timing Explorer (RXTE) satellite, the differences in the rapid X-ray variability between the two main types of neutron star binaries (i.e., the Z and atoll sources) could be explained by invoking different mass accretion rates and magnetic field strengths. However, the results obtained with RXTE now show that these systems are more similar than previously thought and although differences in mass accretion rate are still likely, the differences in the magnetic field strength have become questionable. The great similarities between the neutron star systems and the black-hole candidates at low mass accretion rates also point towards a similar origin of their timing phenomena indicating that the presence or absence of a solid surface, a magnetic field, or an event horizon do not play a significant role in the production mechanisms for the rapid X-ray variability.
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