Evolutionary scenarios for the X-ray binary pulsars 4U 1626-67 and Hercules X-1, and their implications for the decay of neutron star magnetic fields

Details Evolutionary scenarios for the X-ray binary pulsars 4U 1626-67 and Hercules X-1, and their implications for the decay of neutron star magnetic fields Evolutionary scenarios for the X-ray binary pulsars 4U 1626-67 and Hercules X-1, and their implications for the decay of neutron star magnetic fields

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...234..195v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 234, no. 1-2, Aug. 1990, p. 195-202.

Astronomy and Astrophysics

Astrophysics

70

Neutron Stars, Pulsars, Stellar Evolution, X Ray Binaries, Stellar Magnetic Fields, Stellar Mass Accretion, White Dwarf Stars, X-Ray Binaries, Neutron Stars, Field Decay

Scientific paper

Several X-ray pulsars with strong magnetic fields, have mass donors which are old compared to the time scale of 10? yr on which magnetic fields of neutron stars are thought to decay. It has been suggested that such neutron stars were formed recently, via accretion-induced collapse of a white dwarf. We investigate the viability of this suggestion for 4U 1626-67 and Her X-1.
We find that the neutron star in 4U 1626-67 is almost certainly older than ˜108 yr, even if it was formed via accretion- induced collapse. The large distance of Her X-1 to the galactic plane can only be explained if its neutron star formed from a massive progenitor, which implies an age of the neutron star ≳6 × 108 yr. This leads us to suggest that some neutron stars grow old without losing their strong (≳1012 G) magnetic field. If our suggestion is correct, it implies that there is no observational evidence for the occurrence of accretion-induced collapse in any of the systems for which this process has been hitherto suggested. It also implies that the neutron star in 4U 1626-67 has accreted ≳ 0.1 Msun, without losing its magnetic field.

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