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Sco X-1 is the brightest persistent X-ray in the sky. It is generallybelieved that Sco X-1 is a low-mass X-ray binary containing a neutron staraccreting from a low-mass donor star where mass transfer is driven by themagnetic braking. However, the mass transfer rate predicted by the standardmagnetic braking model is at least one order of magnitude lower than the oneinferred by X-ray luminosity. In this work, we investigate whether this sourcecould evolved from an intermediate-mass X-ray binary including Ap/Bp stars witha slightly strong magnetic field of 300 - 1000 G. The coupling between themagnetic field and an irradiation-driven wind induced by the X-ray flux fromthe accretor can yield a strong magnetic braking, which could give rise to arelatively high mass transfer rate. According to the observed orbital period,the mass transfer rate, the mass ratio, and the donor star spectral type, theprogenitor of Sco X-1 should be an intermediate-mass X-ray binary including a1.6 $-$ 1.8 $\rm M_{\odot}$ Ap/Bp donor star in a 1.3 $-$ 1.5 day orbit.Therefore, we propose that anomalous magnetic braking of Ap/Bp stars providesan alternative evolutionary channel to a part of luminous X-ray sources.

Formation of Sco X-1 induced by anomalous magnetic braking of Ap/Bp stars