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Evolution of the X-ray Binary System Sco X-1

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Abstract

The possible evolution of a bright low-mass X-ray binary system Sco X-1 is numerically investigated within the framework of a model assuming that the donor-star of the system (a satellite of a neutron star) fills its Roche lobe. The calculations consider a strong induced stellar wind (ISW) of the donor, which occurs due to irradiation by hard radiation of an accreting relativistic star. At the same time, using the example of Sco X-1, three hypotheses are investigated, within the framework of which a high rate of mass exchange can be obtained for semi-detached X-ray binaries. The first hypothesis is the presence of a strong ISW of the donor with standard magnetic braking. Calculations have shown that in this case it is possible to obtain a high rate of mass exchange, but at the same time the donor cannot fill the Roche lobe—it “goes under it.” The second hypothesis is an increase of magnetic braking, that is, an increase of the loss of angular momentum from the system due to the magnetic stellar wind of the donor (MSW). Such an amplification may be associated with the intense ISW of the donor in the presence of a strong magnetic field. Numerical modeling shows that with an increase of MSW by \( \sim {\kern 1pt} 20\) times, a high rate of mass exchange is possible when the donor fills its Roche lobe. The third hypothesis suggests the possibility of canceling the direct exchange of angular momentum between the orbital moment of the system and the moment of accreted matter passing from a low-mass donor to a more massive accretor. With such cancellation, the main process, increasing the semi-axis of the orbit, disappears. Calculations show that in this case it is possible to obtain a sufficiently high rate of mass exchange. However, the most likely reason for the increase of the rate of mass exchange in low-mass X-ray binary systems is probably the increase of magnetic braking.

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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.

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  1. Institute of Astronomy, Russian Academy of Sciences, 119017, Moscow, Russia

    A. V. Fedorova & A. V. Tutukov

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  1. A. V. Fedorova
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  2. A. V. Tutukov
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Correspondence to A. V. Fedorova or A. V. Tutukov.

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Translated by E. Seifina

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Fedorova, A.V., Tutukov, A.V. Evolution of the X-ray Binary System Sco X-1. Astron. Rep. 67, 1074–1090 (2023). https://doi.org/10.1134/S1063772923100049

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