A Model for the Braking Indices of Pulsars

A Model for the Braking Indices of Pulsars

Author de Oliveira, Heitor O. Google Scholar
Marinho, Rubens M., Jr. Google Scholar
Magalhaes, Nadja S. Autor UNIFESP Google Scholar
Abstract Stars known as pulsars are generally modeled as magnetized spheres made of neutrons with high rotation frequency. It is known that such stars are spinning down and this braking is measured by a parameter, n, known as braking index. For the canonical model such parameter should have a single value for all pulsars: n = 3. However, from observations it is known that n diverges from 3. In this work, differently from the canonical model, we have hypothesized the existence of a variation of the moment of inertia of the star through a time-varying radius. Using energy conservation we find the values for the variation of the radius of our pulsar sample. Our results indicate that it may be reasonable to consider that the radius of pulsars can be changing with time.
Keywords Pulsars
Star Rotation
Magnetic Fields
xmlui.dri2xhtml.METS-1.0.item-coverage Singapore
Language English
Sponsor Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
National Institute of Science and Technology in Astrophysics (INCT-A, Brazil)
National Institute of Science and Technology in Astrophysics (a joint CNPq project, FAPESP )
National Institute of Science and Technology in Astrophysics (a joint FAPESP project, FAPESP)
FAPESP
Grant number INCT-A a joint CNPq project, FAPESP: 2008/57807-5
National Institute of Science and Technology in Astrophysics a joint FAPESP project, FAPESP: 2008/57807-5
FAPESP: 2013/26258-4
Date 2017
Published in Proceedings Of The 7th International Workshop On Astronomy And Relativistic Astrophysics (Iwara 2016). Singapore, v. 45, p. -, 2017.
ISSN 2010-1945 (Sherpa/Romeo, impact factor)
Publisher World Scientific Publ Co Pte Ltd
Extent -
Origin http://dx.doi.org/10.1142/S2010194517600369
Access rights Closed access
Type Conference paper
Web of Science ID WOS:000410658500036
URI https://repositorio.unifesp.br/handle/11600/55458

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