RX J0720.4--3125 as a Possible Example of the Magnetic Field Decay of Neutron Stars

Details RX J0720.4--3125 as a Possible Example of the Magnetic Field Decay of Neutron Stars RX J0720.4--3125 as a Possible Example of the Magnetic Field Decay of Neutron Stars

1997-07-29

arxiv.org/abs/astro-ph/9707318v1

Astronomy Letters (English translation of Pisma v Astronomicheskii Zhurnal), Vol. 23, p. 569-575, 1997 (August)

Astronomy and Astrophysics

Astrophysics

12 pages (LATEX), 2 PostScript figures. Also available at http://xray.sai.msu.su/~polar/ (with the Russian variant of the arti

Scientific paper

10.1007/BF02676708

We studied possible evolution of the rotational period and the magnetic field of the X-ray source RX J0720.4-3125 assuming this source to be an isolated neutron star accreting interstellar medium. Magnetic field of the source is estimated to be $10^6 - 10^9$ G, and it is difficult to explain observed rotational period 8.38 s without invoking hypothesis of the magnetic field decay. We used the model of ohmic decay of the crustal magnetic field. The estimates of accretion rate ($10^{-14} - 10^{-16} M_\odot/yr$), velocity of the source relative to interstellar medium ($10 - 50 $ km/s), neutron star age ($2\cdot 10^9 - 10^{10}$ yrs) are obtained.

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