The role of binding energies of neutron stars on the accretion driven evolution

Details The role of binding energies of neutron stars on the accretion driven evolution The role of binding energies of neutron stars on the accretion driven evolution

2011-02-14

arxiv.org/abs/1102.2912v1

MNRAS 413 (2011) L47

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted for publication in MNRAS Letters

Scientific paper

10.1111/j.1745-3933.2011.01030.x

Millisecond pulsars are believed to descend from low mass x-ray binaries. Observable parameters of binary millisecond pulsars e.g. mass of the pulsar, mass of the companion, spin period of the pulsar, orbital period, orbital eccentricity etc are used to probe the past accretion history of the millisecond pulsars. But unfortunately in these studies, binding energy of the neutron star is not considered commonly. We show that the effect of the binding energy is significant in the estimation of the amount of mass accretion and thus should be incorporated in models for binary evolutions. Moreover, different Equations of State for dense matter give different values for the accreted mass for the same amount of increase in the gravitational mass of the neutron star implying the need of constraining dense matter Equations of State even to understand the spin-up procedure properly.

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