Actas de congresos
Decay of magnetic field in black widow pulsars
Fecha
2013Registro en:
Latin American Regional IAU Meeting, 14, 2013, Florianópolis.
0185-1101
Autor
Castilho, Celia Maria Moraes de
Benvenuto, O. G.
De Vito, M. A.
Horvath, Jorge Ernesto
Institución
Resumen
A small fraction of the binary relativistic systems
display the “black widow” effect: the companion
is being ablated by the (recycled) pulsar wind. In
these binary systems the evolution of the companion
star (of the solar-type) reaches the point of filling
its Roche lobe, thus initiating the process of mass
accretion onto the pulsar. Accretion is generally believed
to result in magnetic field decay, while isolated
neutron star fields decay very slowly, if at all. We
shall show that the very long evolution of the “black widow” system, starting from a solar-type star and
lasting > 5 Gyr to reach the observed position in the
plane, allows us to conclude that the magnetic field
does not decay below the bottom value , extending
the previous conclusions drawn from younger systems.
In addition, the masses of the “black widow”
pulsars are naturally predicted to be > 2 Mo due to
the accretion history, in full agreement with recent
measurements.