SIMBAD references

2009MNRAS.397.1563M - Mon. Not. R. Astron. Soc., 397, 1563-1576 (2009/August-2)

Supernova kicks and misaligned Be star binaries.


Abstract (from CDS):

Be stars are rapidly spinning B stars surrounded by an outflowing disc of gas in Keplerian rotation. Be star/X-ray binary systems contain a Be star and a neutron star. They are found to have non-zero eccentricities and there is evidence that some systems have a misalignment between the spin axis of the star and the spin axis of the binary orbit. The eccentricities in these systems are caused by a kick to the neutron star during the supernova that formed it. Such kicks would also give rise to misalignments. In this paper, we investigate the extent to which the same kick distribution can give rise to both the observed eccentricity distribution and the observed misalignments. We find that a Maxwellian distribution of velocity kicks with a low velocity dispersion, σk~ 15km/s, is consistent with the observed eccentricity distribution but is hard to reconcile with the observed misalignments, typically i ≥ 25°. Alternatively, a higher velocity kick distribution, σk= 265km/s, is consistent with the observed misalignments but not with the observed eccentricities, unless post-supernova circularization of the binary orbits has taken place. We discuss briefly how this might be achieved.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): accretion, accretion discs - stars: emission lines, Be - stars: neutron - X-rays: binaries

Simbad objects: 37

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2009MNRAS.397.1563M and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact