Long-term studies with the Ariel-5 asm. 1: HER X-1, VELA X-1 and CEN X-3

Details Long-term studies with the Ariel-5 asm. 1: HER X-1, VELA X-1 and CEN X-3 Long-term studies with the Ariel-5 asm. 1: HER X-1, VELA X-1 and CEN X-3

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978stin...7830018h&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Ariel Satellites, Binary Stars, Periodic Variations, Stellar Radiation, X Ray Astronomy, X Ray Sources, Centaurus Constellation, Data Reduction, Fast Fourier Transformations, Hercules Nova

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 approximately 35-d variation of Her X-1, for which we can refine the period to 34.875 plus or minus .030-d. No such longer-term periodicity less than 200-d is observed from Vela X-1. The 26.6-d low-state recurrence period for Cen X-3 previously suggested is not observed, but a 43.0-d 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.

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