Study of the cyclotron feature in MXB 0656-072

Details Study of the cyclotron feature in MXB 0656-072 Study of the cyclotron feature in MXB 0656-072

2006-02-06

arxiv.org/abs/astro-ph/0602113v1

Astronomy and Astrophysics

Astrophysics

7 pages, 6 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20054239

We have monitored a Type II outburst of the Be/X-ray binary MXB 0656-072 in a series of pointed RXTE observations during October through December 2003. The source spectrum shows a cyclotron resonance scattering feature at 32.8 +/- 0.5 keV, corresponding to a magnetic field strength of (3.67 +/- 0.06) x 10^12 G and is stable through the outburst and over the pulsar spin phase. The pulsar, with an average pulse period of 160.4 +/- 0.4 s, shows a spin-up of 0.45 s over the duration of the outburst. From optical data, the source distance is estimated to be 3.9 +/- 0.1 kpc and this is used to estimate the X-ray luminosity and a theoretical prediction of the pulsar spin-up during the outburst.

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