Table 1
Overview of our sample: spectral types and UV observations used for spectral fitting.
| Source | Spectral type (Vink et al. 2023)(†) | Ref(†) | Revised spectral type (Bestenlehner et al. 2025) | Instrument(‡) | |
|---|---|---|---|---|---|
| λ <1141 Å | λ >1141 Å | ||||
| Presumed single | |||||
| W61-28-23 | O3.5 V((f+)) | a | O3.5 III(f*) | COS-1096 | COS |
| Sk −67° 167 | O4 Inf+ | b | O4 If | FUSE/L | STIS |
| ST 92-4-18 | O5 If | c | O4 Ifp | − | COS |
| Sk −67°69 | O4 III(f) | b | O4 III(f) | − | STIS |
| Farina-88 | O4 III(f) | d | O4 III(f) | − | COS |
| LMCe 078-1 | O6 Ifc | e | O5 Ifpc | − | COS |
| Sk −67°111 | O6 Ia(n)fpv | f | O6 Ia(n)fpv | FUSE/L | STIS |
| N11-018 | O6 II(f+) | g | O6.5 II(f) | FUSE/M | COS |
| Sk −69°50 | O7(n)(f)p | f | O7 I(n)(f)p | FUSE/L | STIS |
| Sk −71°50 | O6.5 III | h | O7 III(f)p | FUSE/L | STIS+ |
| Sk −69° 104 | O6 Ib(f) | i | O7 III(f) | FUSE/L | STIS+ |
| Sk −68°16 | O7 III | c | O7 III(f) | − | STIS |
| LH 9-34 | O8.5 Iaf | j | O8-8.5 Ifp | − | STIS |
| Sk −66°171 | O9 Ia | k | O9 Ia | FUSE/L | STIS+ |
| Sk −71°41 | O9.7 Iab | l | O9.5 Ib | FUSE/M | STIS |
| Sk −67°5 | O9.7 Ib | i | B0 Ib | FUSE/L | STIS+ |
| Signs of binarity | |||||
| LH 114-7 | O2 III(f*)+OB? | m | O2 III(f*) | − | STIS |
| VFTS-267 | O3 III-I(n)f* | n | O3.5 III(f*) | − | COS |
| Sk −71°46 | O4 If | o | O4 If | − | COS |
| Sk −67°108 | O4-5 III | k | O5 III(f) | FUSE/L | STIS |
| Sk −71°19 | O6 III | h | O6 V((f)) | FUSE/L | COS |
| Sk −70°115 | O6 If+O8: | p | O6.5 Ifc | FUSE/L | STIS+ |
| BI 173 | O8 II: | q | O7.5 III((f))p | FUSE/L | STIS+ |
| Sk −68°155 | B0.5 I | r | O9 Ia | FUSE/L | COS® |
| BI 272 | O7 II | h | O7:V + B2 | − | STIS |
Notes. The stars are ordered from early to late, adopting the spectral types of Bestenlehner et al. (2025). Optical observations are not specified here: all were obtained with VLT/X-shooter. (†) Vink et al. (2023) list spectral types from literature; original references: a: Massey et al. (2005), b: Garmany & Walborn (1987), c: Massey et al. (2000), d: Fariña et al. (2009), e: Massey et al. (2017), f: Walborn et al. (2010), g: Evans et al. (2006), h: Conti et al. (1986), i: Walborn (1977), j: Parker et al. (1992), k: Fitzpatrick (1988), l: Ramachandran et al. (2018b), m: Walborn et al. (2002b), n: Walborn et al. (2014), o: Massey et al. (1995), p: Niemela & Gamen (2004), q: Walborn et al. (2002a), r: Rousseau et al. (1978). (‡)‘FUSE/L’ and ‘FUSE/M’ indicate that FUSE/LWRS and FUSE/MDRS data were used, respectively. ‘COS-1096’ indicates COS/G130M/1096 data. ‘STIS’ indicates STIS/E140M/1425 data, ‘STIS+’ indicates STIS/E140M/1425 and STIS/E230M/1978 data. ‘COS’ indicates COS/G130M/1291 and COS/G160M/1611 data. (β)In the case of Sk -68’155 the COS/G130M/1291 data do not reach lower than 1178 Å, and we therefore use FUSE/LWRS data for the range 1141-1178 Å.
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