4.7 Article

Signs of magnetic accretion in the young Be/X-ray pulsar SXP 1062

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出版社

WILEY-BLACKWELL
DOI: 10.1111/j.1745-3933.2012.01285.x

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accretion, accretion discs; stars: magnetic field; stars: neutron; X-rays: binaries; X-rays: individual: SXP 1062

资金

  1. Programme of Presidium of Russian Academy of Sciences [N 21]
  2. [NSH-1625.2012.2]

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The spin behaviour of the neutron star in the newly discovered young Be/X-ray long-period pulsar SXP 1062 is discussed. The star is observed to rotate with the period of 1062 s, and spin down at the rate similar to-2.6 x 10(-12) Hz s(-1). I show that all of the conventional accretion scenarios encounter major difficulties in explaining the rapid spin-down of the pulsar. These difficulties can be, however, avoided within the magnetic accretion scenario in which the neutron star is assumed to accrete from a magnetized wind. The spin-down rate of the pulsar can be explained within this scenario provided the surface magnetic field of the neutron star is B-* similar to 4 x 10(13) G. I show that the age of the pulsar in this case lies in the range (2-4) x 10(4) yr, which is consistent with observations. The spin evolution of the pulsar is briefly discussed.

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