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2010MNRAS.401.2552D - Mon. Not. R. Astron. Soc., 401, 2552-2560 (2010/February-1)
Evolution of low-mass close binary systems with a neutron star: its dependence with the initial neutron star mass.
DE VITO M.A. and BENVENUTO O.G.
Abstract (from CDS):
It is found that the evolution of systems, with fixed initial values for the orbital period and the mass of the normal donor star, heavily depends upon the mass of the neutron star. In some cases, varying the initial value of the neutron star mass, we obtain evolved configurations ranging from ultra-compact to widely separated objects.
We also analyse the dependence of the final orbital period with the mass of the white dwarf. In agreement with previous expectations, our calculations show that the final orbital period-white dwarf mass relation is fairly insensitive to the initial neutron star mass value. A new period-mass relation based on our own calculations is proposed, which is in good agreement with period-mass relations available in the literature.
As a consequence of considering a set of values for the initial neutron star mass, these models allow finding different plausible initial configurations (donor and neutron star masses and orbital period interval) for some of the best observed binary systems of the kind we are interested in here. We apply our calculations to analyse the case of PSR J0437-4715, showing that there is more than one possible set of initial parameters (masses, period and the fraction β of matter accreted by the neutron star) for this particular system.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): binaries: close - stars: evolution - white dwarfs
Simbad objects: 11
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