Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...184..209h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 184, no. 1-2, Oct. 1987, p. 209-214.
Astronomy and Astrophysics
Astrophysics
11
B Stars, Eccentric Orbits, Stellar Evolution, Stellar Mass, X Ray Binaries, Molecular Clouds, Neutron Stars, O Stars, Orbital Elements, Stellar Magnetic Fields, Supernovae
Scientific paper
Previous evolutionary scenarios for the formation of Be/X-ray binaries from moderately massive close binaries explain the observed range of orbital periods (Porb) but not the observed large orbital eccentricities e unless an asymmetric supernova (SN) explosion is assumed. As an alternative, the paper presents a scenario in which highly eccentric Be/X-ray binaries are formed from very massive close binaries in a symmetric SN explosion after highly nonconservative evolution. This scenario may apply to systems with Porb less than about 50 d and e greater than about 0.3 and, in particular, to the X-ray binary A 0538-668. The age and runaway velocity of A 0538-668 as derived from the alternative scenario are discussed. It is concluded that the system is in any case old (greater than about 2-3 x 10 to the 7th yr). This agrees with the derived ages from the pulse period and magnetic field strength of the neutron star in A 0538-668. The derived runaway velocity in any evolutionary scenario is so large (since e is so large) that A 0538-668 is unlikely to be a member of the O-association against which it is projected in the LMC.
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