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Title:
Populating the Galaxy with low-mass X-ray binaries
Authors:
Kiel, Paul D.; Hurley, Jarrod R.
Affiliation:
AA(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia; Department of Mathematics, PO Box 28M, Monash University, Victoria 3800, Australia), AB(Department of Mathematics, PO Box 28M, Monash University, Victoria 3800, Australia)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 369, Issue 3, pp. 1152-1166. (MNRAS Homepage)
Publication Date:
07/2006
Origin:
MNRAS
MNRAS Keywords:
binaries: close: stars: evolution: stars: low-mass, brown dwarfs: stars: neutron: Galaxy: stellar content: X-rays: binaries, binaries: close, stars: evolution, stars: low-mass, brown dwarfs, stars: neutron, Galaxy: stellar content, X-rays: binaries
DOI:
10.1111/j.1365-2966.2006.10400.x
Bibliographic Code:
2006MNRAS.369.1152K

Abstract

We perform binary population-synthesis calculations to investigate the incidence of low-mass X-ray binaries (LMXBs) and their birth rate in the Galaxy. We use a binary-evolution algorithm that models all the relevant processes including tidal circularization and synchronization. Parameters in the evolution algorithm that are uncertain and may affect X-ray binary formation are allowed to vary during the investigation. We agree with previous studies that under standard assumptions of binary evolution the formation rate and number of black hole (BH) LMXBs predicted by the model are more than an order of magnitude less than what is indicated by observations. We find that the common-envelope process cannot be manipulated to produce significant numbers of BH LMXBs. However, by simply reducing the mass-loss rate from helium stars adopted in the standard model, to a rate that agrees with the latest data, we produce a good match to the observations. Including LMXBs that evolve from intermediate-mass systems also leads to favourable results. We stress that constraints on the X-ray binary population provided by observations are used here merely as a guide as surveys suffer from incompleteness and much uncertainty is involved in the interpretation of results.

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