Do all binary X-ray pulsars spin-up by accretion from a Keplerian disc

Details Do all binary X-ray pulsars spin-up by accretion from a Keplerian disc Do all binary X-ray pulsars spin-up by accretion from a Keplerian disc

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....83..375s&link_type=abstract

Astronomy and Astrophysics, vol. 83, no. 3, Mar. 1980, p. 375-377. Research supported by the European Space Agency.

Astronomy and Astrophysics

Astrophysics

7

Astrophysics, Binary Stars, Pulsars, Stellar Mass Accretion, X Ray Stars, Angular Momentum, Roche Limit, Stellar Winds

Scientific paper

It is examined whether the observed spin-up rates of binary X-ray pulsars can be explained by accretion of low angular momentum stellar wind matter from the optical counterparts, without the mediation of a Keplerian disk. It is concluded that of the three X-ray pulsars considered, Vela X-1, Cen X-3 and SMC X-1, only Vela X-1 is likely to be powered by the stellar wind of its companion. Cen X-3 and SMC X-1 are presumably surrounded by an accretion disk and powered by critical lobe overflow.

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