Time variation of the pulse period of Vela X-1 |
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Authors: | Fumiaki Nagase |
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Institution: | (1) Department of Astrophysics, Nagoya University, Nagoya, Japan |
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Abstract: | X-ray pulsar Vela X-l was observed with the X-ray astronomy satellite HAKUCHO in five occasions between March 1979 and March 1981. An increase of the pulsation period at an average rate of P/P 3.0 × 10–4 yr–1 was observed over the time span of two years. Besides, variations of the pulse period in the time scale of 10 days were resolved in superposition on the secular spin-down trend. The observed rate of change P - 3 × 10–8, for both spin-up and spin-down, is an order of magnitude greater than the secular spin-down rate. |
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