HEAO 1 high-energy X-ray observations of Centaurus X-3

Details HEAO 1 high-energy X-ray observations of Centaurus X-3 HEAO 1 high-energy X-ray observations of Centaurus X-3

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272..678h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 15, 1983, p. 678-686.

Astronomy and Astrophysics

Astrophysics

13

Binary Stars, Centaurus Constellation, Heao 1, Pulsars, X Ray Sources, Luminosity, Pulsed Radiation, Radiant Flux Density, X Ray Spectra

Scientific paper

Pulsations of 4.8 sec were detected up to energies above 38 keV by the present High Energy X-ray and Low Energy Gamma-Ray HEAO 1 satellite experiment observations of Cen X-3, and an analysis of the X-ray spectrum as a function of pulse phase indicates that the spectrum hardens during an interval of about 1.2 sec which lags the pulse peak by about 0.6 sec. The results of correlated observations of pulse period and X-ray intensity include (1) the detection of a high intensity state during which the pulse period is on the average increasing, (2) the measurement of comparable high intensities during episodes of both period increase and decrease, (3) the detection of X-ray pulsations at a much reduced level during a period of low intensity, and (4) the detection of a transition between spin-down, and spin-up episodes that coincides with a rapid decrease in X-ray intensity.

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