Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-02-18
Mon.Not.Roy.Astron.Soc. 326 (2001) 274
Astronomy and Astrophysics
Astrophysics
9 pages, 6 figures
Scientific paper
10.1046/j.1365-8711.2001.04606.x
We present results and applications of high precision timing measurements of the millisecond pulsar J1012+5307. Combining our radio observations with results based on optical observations, we derive complete 3-D velocity information for this system. Correcting for Doppler effects, we derive the intrinsic spin parameters of this pulsar and a characteristic age of 8.6 +/- 1.9 Gyr. Our upper limit for the orbital eccentricity of only 8 * 10^-7 (68% C.L.) is the smallest ever measured for a binary system. We demonstrate that this makes the pulsar an ideal laboratory to test certain aspects of alternative theories of gravitation. Our precise measurements suggest deviations from a simple pulsar spin-down timing model, which are consistent with timing noise and the extrapolation of the known behaviour of slowly rotating pulsars.
Backer Donald C.
Camilo Fernando
Doroshenko Oleg
Kramer Mallie Mae
Lange Ch.
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