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Table A.1

Photometry and extinction properties of the stars in our sample.

Source U [mag] B [mag] V [mag] J [mag] H [mag] K [mag] AV [mag] MV [mag] AK [mag] MK [mag] Ref
Presumed single
W61-28-23 12.52 13.65 13.81 14.16 14.20 14.24 0.55 −5.22 0.06 −4.30 c, l
Sk −67°167 11.24 12.31 12.53 12.90 12.88 12.94 0.54 −6.48 0.06 −5.60 b, l
ST 92-4-18 12.63 13.64 13.66 13.77 13.77 13.78 0.91 −5.73 0.10 −4.80 c, l
Sk −67°69 11.88 12.93 13.09 13.52 13.64 13.60 0.49 −5.88 0.06 −4.93 i, l
Farina-88 12.87 13.56 13.63 13.86 13.82 13.92 0.93 −5.78 0.11 −4.66 d, l
LMCE 078-1 12.49 13.46 13.49 13.68 13.75 0.83 −5.82 0.09 −4.82 d, l
Sk-67°111 11.33 12.39 12.60 12.95 12.95 13.02 0.53 −6.41 0.06 −5.52 b, l
N11-018 13.04 13.13 13.33 13.31 13.35 0.79 −6.13 0.09 −5.22 h, l
Sk −69°50 12.16 13.15 13.31 13.60 13.67 13.66 0.63 −5.80 0.07 −4.89 b, l
Sk −71°50 12.31 13.32 13.44 13.73 13.76 13.82 0.65 −5.69 0.07 −4.73 i, l
Sk −69°104 10.86 11.89 12.10 12.53 12.62 12.63 0.45 −6.83 0.05 −5.90 f, l
Sk −68°16 11.68 12.66 12.85 13.36 13.43 13.45 0.44 −6.07 0.05 −5.08 b, l
LH 9-34 11.66 12.61 12.69 12.88 12.86 12.86 0.82 −6.61 0.09 −5.71 g, l
Sk −66°171 11.02 12.04 12.19 12.62 12.57 12.62 0.55 −6.84 0.06 −5.92 e, l
Sk −71°41 11.78 12.75 12.82 12.94 12.98 12.91 0.86 −6.52 0.10 −5.67 b, l
Sk −67°5 11.53 12.48 12.68 13.03 13.07 13.16 0.56 −6.35 0.06 −5.38 d, l
Signs of binarity
LH 114-7 12.27 13.41 13.66 14.12 14.26 14.38 0.32 −5.13 0.04 −4.13 b, m
VFTS-267 13.44 13.49 13.34 13.27 13.30 1.19 −6.18 0.14 −5.31 j, l
Sk −71°46 12.37 13.26 13.27 13.02 12.93 12.99 1.30 −6.51 0.15 −5.64 a, l
Sk −67°108 11.33 12.37 12.57 13.07 13.06 13.15 0.44 −6.34 0.05 −5.38 b, l
Sk −71°19 13.15 14.03 14.23 14.77 14.87 14.85 0.45 −4.70 0.05 −3.68 d, l
Sk −70°115 11.16 12.14 12.24 12.37 12.30 12.33 0.88 −7.12 0.10 −6.25 e, l
BI 173 11.78 12.80 12.96 13.24 13.27 13.30 0.64 −6.15 0.07 −5.25 b, l
Sk −68°155 11.84 12.74 12.75 12.63 12.64 12.60 1.14 −6.87 0.13 −6.01 b, l
BI 272 12.05 13.06 13.28 13.72 13.79 13.86 0.45 −5.64 0.05 −4.67 k, l

Notes. AV, MV, AK and MK are derived in this work by fitting the Fitzpatrick (1999) extinction curve, adopting RV = 3.1 (see main text). Observed magnitudes are taken from the literature overview of Vink et al. (2023); references are indicated in the last column, where the first letter refers to the U, B, and V photometry, and the second to the J, H, and Ks photometry: a: Massey et al. (1995), b: Massey (2002), c: Massey et al. (2000), d: Zaritsky et al. (2004), e: Isserstedt (1975), f: Ardeberg et al. (1972), g: Schmidt-Kaler et al. (1999), h: Evans et al. (2006), i: Isserstedt (1979), j: Evans et al. (2011), k: Isserstedt (1982), l: J and Ks from Cioni et al. (2011), H from Cutri et al. (2003), m: J, H, and Ks from Cutri et al. (2012).

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