Angular momentum loss and the evolution of binaries of extreme mass ratio

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Binary Stars, Momentum Transfer, Pulsars, Stellar Evolution, Stellar Mass Ejection, Angular Momentum, Mass Ratios, X Ray Binaries

Scientific paper

Results are presented for 10 evolutionary sequences of close binary systems of extreme mass ratio. Angular momentum loss associated with material outflow from the system, a consequence of the ineffectiveness of tidal torques, as well as gravitational radiation is included in the calculations. It is found that a previously described mass transfer instability is extremely sensitive to the amount of angular momentum loss by material means. The application of these results to the millisecond pulsar PSR 1937 + 214 suggests that its origin does not involve the continuous accretion of matter in a low-mass X-ray binary system.

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