Fig. 5.
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Two examples of HST/STIS G230L spectra that deviate from a normal B-type star continuum. This behaviour is observed in SkKM 108, 209, 286, and 320 (209 and 286 shown in this figure). The red spectrum shows an IUE spectrum of 32 Cyg published in Che et al. (1983) at an orbital phase of 0.7. The blue spectrum shows an example of a normal B-type spectrum of Alpha Sco B from unpublished IUE data retrieved from the INES database (programme ID LGLMS; PI: M. A. Smith), which highlights the differences observed. Note that as the comparison stars (Alpha Sco B and 32 Cyg) are both galactic stars, the flux distribution bluewards of ∼2500 Å is different as a result of the differing extinction laws in the two galaxies. Line identifications are shown in grey. We note that in the SMC spectra the Mg II feature is dominated by the interstellar component.
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