Abstract
A neutron star in a weak stellar wind from a binary companion will spindown because of pulsar emission and the ‘ propeller ’ mechanism of Illarionov & Sunyaev. Large density fluctuation in this wind can then turn the neutron star into a transient X-ray source with a relatively long rotation period. The transient X-ray source, Ariel 1118 – 61, which has a period of 6·75 min is shown to be in general agreement with the above considerations.

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