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A massive helium star with a sufficiently strong magnetic field to form a magnetar

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arxiv 2308.08591 v1 pith:ZEFV457L submitted 2023-08-16 astro-ph.SR astro-ph.HE

A massive helium star with a sufficiently strong magnetic field to form a magnetar

T. Shenar , G. A. Wade , P. Marchant , S. Bagnulo , J. Bodensteiner , D. M. Bowman , A. Gilkis , N. Langer
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A.-N. Chene L. Oskinova T. Van Reeth H. Sana N. St-Louis A. Soares de Oliveira H. Todt S. Toonen
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classification astro-ph.SR astro-ph.HE
keywords starsfieldmagneticstarwolf-rayetheliummagnetarmass
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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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