S. B. Popov
Published 2015-07-28Version 1
I review several scenarios of magnetar formation in binary systems via spin-up of a progenitor due to interaction with its companion. Mostly, these evolutionary channels lead to formation of isolated magnetars, and indeed, all well-established sources of this class are single objects. However, some binaries can survive, and several candidates to accreting magnetars have been proposed. I discuss this issue, and conclude that new accretion models can explain properties of the proposed candidates without large magnetic field in correspondence with models of magnetic field evolution.
Comments: 10 pages, no figures, based on a talk presented at "Ioffe Workshop on GRBs and other transient sources: 20 Years of Konus-Wind Experiment", subm. to a special issue of Astron. Astrophys. Trans
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