Time variation of the pulse period of VELA X-1

Details Time variation of the pulse period of VELA X-1 Time variation of the pulse period of VELA X-1

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30..395n&link_type=abstract

(European Space Agency, ESLAB Symposium on X-ray Astronomy, 15th, Amsterdam, Netherlands, June 22-26, 1981.) Space Science Revie

Astronomy and Astrophysics

Astronomy

11

Eclipsing Binary Stars, Pulsars, Pulse Duration, Secular Variations, X Ray Sources, Japanese Space Program, Orbital Elements, Pulsed Radiation, Satellite-Borne Instruments, Stellar Rotation

Scientific paper

The X-ray pulsar Vela X-1 was observed with the X-ray astronomy satellite Hakucho on five occasions between March 1979 and March 1981. An increase of the pulsation period at an average rate of about 0.00030/yr was observed over the time span of two years. Variations of the pulse period in the time scale of about 10 days were resolved in superposition on the secular spin-down trend. The observed rate of change, 3 x 10 to the -8th for both spin-up and spin-down, is an order of magnitude greater than the secular spin-down rate.

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