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Fig. 3

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Orbital geometry of BD +60 73, as seen when looking down on the orbital plane, with the compact companion’s orbit indicated by the solid line in relative units. The dotted and dashed lines correspond to the orbits that the optical companion would have if the compact companion had a mass of 1.7 M (i = 90°; dotted) or 3.5 M (i = 30°; dashed), both corresponding to a mass M ~ 22   M for the optical companion, as suggested in Sect. 5. The centre-of-mass of the system is marked by the cross, and the position and phases of periastron and apastron (solid circles) and superior and inferior conjunction (open circles) along with the phase corresponding to maximum X-ray flux (open square) are also labelled.

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