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Observations uncover synchronous decreases in eclipsing minima in SS433, suggesting a third light source at mass-loss rates.
UBVRcIc observations of microquasar SS 433 from 1980 to 2023 revealed a stable effect unusual for classical eclipsing binary systems. In the phases of maximum accretion disk opening, the depths of the primary and secondary eclipsing minima of the orbital light curve decrease synchronously with increasing wavelength. To explain this effect, we have used the model of an eclipsing binary system in which there is a third non- eclipsing light. We show that the main source of the third light at a mass-loss rate of 10−4
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A.V. Dodin (2025) studied this question.
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