X-Ray Timing of the 34 Millisecond Binary Pulsar SAX J0635+0533

Astronomy and Astrophysics – Astronomy

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Gamma Rays: Observations, Stars: Pulsars: General, Stars: Individual: Alphanumeric: 2Eg J0635+0521, Stars: Individual: Alphanumeric: Sax J0635+0533, Stars: Neutron

Scientific paper

Modulations detected in the observed spin period of the 34 ms X-ray pulsar SAX J0635+0533 show that the pulsar is in a binary system with a period of 11.2+/-0.5 days, a projected orbital semimajor axis asini=83+/-11 lt-s, a mass function in the range of 3.4-7.8 Msolar, and an orbital eccentricity of 0.29+/-0.09. A combination of observations spanning 2 yr places a lower bound on the intrinsic period derivative of the pulsar of 3.8×10-13. The period derivative implies a high torque on the neutron star that would require a very high mass accretion rate, in excess of 6×10-7 Msolar yr-1, if produced via accretion. The torque and X-ray luminosity are both within the range typical of young, rotation-powered pulsars.

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