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Constrains on parameters of magnetic field decay for accreting isolated neutron stars | | S.B. Popov
; M.E. Prokhorov
; | | Date: |
19 May 2000 | | Subject: | astro-ph | | Affiliation: | Sternberg Astronomical Institute | | Abstract: | The influence of exponential magnetic field decay (MFD) on the spin evolution of isolated neutron stars is studied. The ROSAT observations of several X-ray sources, which can be accreting old isolated neutron stars, are used to constrain the exponential and power-law decay parameters. We show that for the exponential decay the ranges of minimum value of magnetic moment, $mu_b$, and the characteristic decay time, $t_d$, $sim 10^{29.5}ge mu_b ge 10^{28} {
m G} {
m cm}^3$, $sim 10^8ge t_d ge 10^7 {
m yrs}$ are excluded assuming the standard initial magnetic moment, $mu_0=10^{30} {
m G} {
m cm}^3$. For these parameters, neutron stars would never reach the stage of accretion from the interstellar medium even for a low space velocity of the stars and a high density of the ambient plasma. The range of excluded parameters increases for lower values of $mu_0$. We also show, that, contrary to exponential MFD, no significant restrictions can be made for the parameters of power-law decay from the statistics of isolated neutron star candidates in ROSAT observations. Isolated neutron stars with constant magnetic fields and initial values of them less than $mu_0 sim 10^{29} {
m G} {
m cm}^3$ never come to the stage of accretion. We briefly discuss the fate of old magnetars with and without MFD, and describe parameters of old accreting magnetars. | | Source: | arXiv, astro-ph/0005402 | | Services: | Forum | Review | PDF | Favorites | |
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