Fig. 3.
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Ultraviolet spectrum of Ho II X-1 normalised to the stellar model continuum. Solid blue: the COS disentangled spectrum; dotted green: the modelled PoWR stellar spectrum of a B0.5I supergiant (T* = 26 k K, log g = 3.1 [cm s−2] and log L/L⊙ = 5.3, see Sect. 3.1); dotted purple: the CLOUDY nebular model for an X-ray ionising source modelled with diskir (see Sect. 3.3); dotted red: the combined PoWR and CLOUDY spectra. This last one also accounts for interstellar absorption lines (i.s.)
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