Magnetic field decay and period evolution of the source RX J0720.4-3125
Popov, S. B. · Konenkov, D. Yu.
Original · EN
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 from the interstellar medium. Magnetic field of the source is estimated to be 10⁶ - 10⁹ Gs (most probably ≈ 2· 10⁸ Gs), and it is difficult to explain the observable 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 the accretion rate (10⁻¹⁴ - 10⁻¹⁶ M/yr), velocity of the source relative to the interstellar medium (10 - 50 km/s), the neutron star age (2· 10⁹ - 10¹⁰ yrs) are obtained.
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