Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..563h&link_type=abstract
Astrophysical Journal, Part 1, vol. 227, Jan. 15, 1979, p. 563-568.
Astronomy and Astrophysics
Astronomy
24
Ariel 5 Satellite, Binary Stars, Satellite Observation, X Ray Astronomy, X Ray Stars, Fast Fourier Transformations, Histograms, Light Curve
Scientific paper
Twelve hundred days of 3-6 keV X-ray data from Her X-1, Vela X-1, and Cen X-3 accumulated with the Ariel 5 All-Sky Monitor are interrogated. The binary periodicities of all three can be clearly observed, as can the 35 day variation of Her X-1, for which we can refine the period to 34.875 plus or minus 0.030 days. No such longer-term periodicity less than 200 days is observed from Vela X-1. The 26.6 days low-state recurrence period for Cen X-3 is not observed, but a 43.0 day candidate periodicity is found which may be consistent with the precession of an accretion disk in that system. The present results are illustrative of the long-term studies which can be performed on approximately 50 sources over a temporal base which will ultimately extend to at least 1800 days.
Boldt Elihu A.
Holt Stephen S.
Kaluzienski L. J.
Serlemitsos P. A.
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