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Magnetars are highly magnetized neutron stars; their formation mechanism is
unknown. Hot helium-rich stars with spectra dominated by emission lines are
known as Wolf-Rayet stars. We observe the binary system HD 45166 using
spectropolarimetry, finding that it contains a Wolf-Rayet star with a mass of 2
solar masses and a magnetic field of 43 kilogauss. Stellar evolution
calculations indicate that this component will explode as a type Ib or IIb
supernova, and the strong magnetic field favors a magnetar remnant. We propose
that the magnatized Wolf-Rayet star formed by the merger of two lower mass
helium stars.
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