Braking indices of pulsars obtained in the presence of an effective force
Magalhães, Nadja Simão [UNIFESP]
Okada, Anderson Seiji [UNIFESP]
Is part ofMonthly Notices Of The Royal Astronomical Society
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Braking indices of pulsars present a scientific challenge as their theoretical calculation is still an open problem. In this paper, we report results of a study regarding such calculation which adapts the canonical model (which admits that pulsars are rotating magnetic dipoles) basically by introducing a compensating component in the energy conservation equation of the system. This component would correspond to an effective force that varies with the first power of the tangential velocity of the pulsar's crust. We test the proposed model using data available and predict braking indices values for different stars. We comment on the high braking index recently measured of the pulsar J1640-4631.
CitationMonthly Notices Of The Royal Astronomical Society. Oxford, v. 461, n. 4, p. 3993-3996, 2016.
Keywordsstars: fundamental parameters
stars: magnetic field
pulsars: individual: PSR B0531+21, PSR B1509-58, PSR B0540-69, PSR B0833-45, PSR J1119-6127, PSR J1846-0258, PSR J1640-4631
SponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
National Institute of Science and Technology in Astrophysics (INCT-A, Brazil)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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