Change in the orbital period of a binary system due to an outburst in a windy accretion discстатья
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Дата последнего поиска статьи во внешних источниках: 8 декабря 2021 г.
Аннотация:We consider a new mechanism for the removal of angular momentum from an X-ray binarysystem and the change in its orbital period—the mass loss in the form of a wind from an accretion disk. A powerful wind from a disk is observed in X-ray transients and is predicted by models. We have obtainedan analytical estimate for the increase in the orbital period of a binary system with a wind from the disk during an outburst; quantitative estimates are given for the systems XTE J1118+480, A0620−00, andGRS 1124−68. The rates of increase in the period are comparable in absolute value to the observed ratesof secular decrease in the period. We also compare the predicted rates of change in the period of a binarysystem due to the mass transfer into the disk and the outflow from the second Lagrange point with the observed ones. We conclude that the above-mentioned mechanisms cannot explain the observed secular decrease in the period, and it is necessary to consider a circumbinary disk that removes the binary’s angularmomentum.