QPOs and preferred time scales in the variability of X ray pulsars

Details QPOs and preferred time scales in the variability of X ray pulsars QPOs and preferred time scales in the variability of X ray pulsars

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296...81a&link_type=abstract

In its The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 81-87 (SEE N90-25711 19-89)

Astronomy and Astrophysics

Astronomy

5

Noise Spectra, Pulsars, Stellar Mass Accretion, Stellar Oscillations, X Ray Binaries, Periodic Variations, Radio Bursts, Spectrum Analysis, Variability, Variable Stars

Scientific paper

Fourier analysis techniques are applied to investigate the noise variability of two X-ray pulsars observed with EXOSAT, EXO 2030+375 and SMC X-1. In the power spectra of EXO 2030+375 a peak was detected and interpreted as due to Quasi-Periodic Oscillations (QPOs). The observed QPOs strength, frequency and frequency-luminosity dependence are in agreement with the predictions of the beat frequency model for QPOs. In the power spectra of SMC X-1 a highly significant turnover for frequencies lower than 0.01 Hz is present. This indicates a preferred time scale of approximately 100 seconds in the source variability. A single burst-like event lasting approximately 80 seconds is probably a manifestation of the source activity on this sort of time scale.

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