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An Evolutionary Scenario for Short Period (≤10 Days) Millisecond Binary Pulsars

Published online by Cambridge University Press:  12 April 2016

E. Ergma ,
M. J. Sarna  and
J. Antipova
E. Ergma
Affiliation:
Tartu University, Physics Department, Ülikooli 18, EE2400, Tartu, Estonia NORDITA, Blegdamsvej 17, DK2100, Copenhagen 0, Denmark
M. J. Sarna
Affiliation:
Tartu University, Physics Department, Ülikooli 18, EE2400, Tartu, Estonia N. Copernicus Astronomical Center, Polish Academy of Science, ul. Bartycka 18, 00–716 Warsaw, Poland
J. Antipova
Affiliation:
Tartu University, Physics Department, Ülikooli 18, EE2400, Tartu, Estonia

Extract

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We present numerical calculations that simulate the evolution of a low mass (1M⊙) star transfering mass to a compact object (Muslimov & Sarna 1993; Ergma & Sarna 1996). Mass transfer starts when the secondary turns off the main sequence (having a small helium core). We have calculated 14 evolutionary sequences with the assumption of non-conservative or conservative evolution. We can conclude that near the bifurcation point the evolution is very sensitive to: (i) the assumption of conservative or non-conservative evolution, (ii) the structure of the mass losing star. Small changes in the initial period when the secondary fills its Roche lobe will lead to large changes in the final period and final mass of the remnant. Presently there are 40 known low-mass binary pulsars (LMBP). The evolutionary scenario for the wider systems (10 < Porb(d) < 1000) is connected with that of wide low-mass X-ray binaries (LMXB) in which the donor star will fill its Roche lobe after helium core formation.

Type
Post Common Envelope Binaries & Evolution
Information
International Astronomical Union Colloquium , Volume 158: Cataclysmic Variables and Related Objects , 1996 , pp. 473 - 474
Copyright
Copyright © Kluwer 1996

References

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