1998 (IPP)
Permanent URI for this collectionhttp://localhost:4000/handle/11007/2980
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Item Evolution of multipolar magnetic field in isolated neutron stars(2015-03-13) Mitra, Dipanjan; Konar, Sushan; Bhattacharya, DipankarItem Magnetic field evolution of accreting neutron stars - III(2015-03-13) Konar, Sushan; Bhattacharya, DipankarThe evolutionary scenario of the neutron star magnetic field is examined assuming a spindown-induced expulsion of magnetic flux originally confined to the core, in which case the expelled flux undergoes ohmic decay. The nature of field evolution, for accreting neutron stars, is investigated incorporating the crustal microphysics and material movement due to accretion. This scenario explains the observed field strengths of neutron stars but only if the crustal lattice contains a large amount of impurity which is in direct contrast to the models that assume an original crustal field.Item Magnetic field evolution of accreting neutron stars- II(2015-03-13) Konar, Sushan; Bhattacharya, DipankarWe investigate the evolution of the magnetic field of isolated pulsars and of neutron stars in different kinds of binary systems, assuming the field to be originally confined to the crust. Our results for the field evolution in isolated neutron stars helps us to constrain the physical parameters of the crust. Modelling the full evolution of a neutron star in a binary system through several stages of interaction we compare the resulting final field strength with that observed in neutron stars in various types of binary systems. One of the interesting aspects of our result is a positive correlation between the rate of accretion and the final field strength, for which some observational indication already exists. Our results also match the overall picture of the field evolution in neutron stars derived from observations.