Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340l..21l&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 340, May 1, 1989, p. L21-L23.
Astronomy and Astrophysics
Astrophysics
14
Galactic Bulge, Milky Way Galaxy, Neutron Stars, X Ray Binaries, Color-Color Diagram, Exosat Satellite, Noise Intensity, Power Spectra, Stellar Oscillations
Scientific paper
The timing analysis of four Exosat observations of the bright Galactic burst source 4U 1705-44 is presented. A correlation is found between the aperiodic noise components and the spectral variability. 4U 1705-44 shows in its low-intensity state a strong variability of the X-ray flux in the frequency range 1-64 Hz, corresponding to an rms modulation of 20 percent. During this low-intensity state, where the spectrum is hardest and type I bursts are most frequent, the hardness of the energy spectrum shows a negative correlation with intensity. In the high-intensity state, the shape of the power spectrum is best described by a power law. In this state, no significant signal at frequencies greater than 1 Hz is measured and the spectral hardness shows no clear correlation with intensity.
Hasinger Guenter
Langmeier Andreas
Truemper Joachim
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