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The Formation of Low-Mass Transient X-Ray Binaries | A. R. King
; U. Kolb
; | Date: |
16 Dec 1996 | Subject: | astro-ph | Affiliation: | University of Leicester, U.K. | Abstract: | We consider constraints on the formation of low-mass X-ray binaries containing neutron stars (NLMXBs) arising from the presence of soft X-ray transients among these systems. We show that in short-period systems driven by angular momentum loss these constraints require the secondary at the beginning of mass transfer to have a mass > 1.2 M_sun, and to be significantly nuclear-evolved. As a consequence a comparatively large fraction of such systems appear as soft X-ray transients even at short periods, as observed. Moreover the large initial secondary masses account for the rarity of NLMXBs at periods less than 3 hr. In contrast, NLMXB populations forming with large kick velocities would not have these properties, suggesting that the kick velocity is generally small compared to the pre-SN orbital velocity in a large fraction of systems. We derive constraints on progenitor system parameters and on the strength of magnetic braking. | Source: | arXiv, astro-ph/9612154 | Services: | Forum | Review | PDF | Favorites |
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