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Table 4

Basic observed properties.

VFTS Spectral type V BV J H Ks [3.6] [4.5] [5.8] IC VIC

450 O9.7 II–Ib + O7:: 13.60 0.20 13.08 12.91 12.89 11.00 10.65 10.52 13.26 +0.19
652 B1 Ib + O9: III: 13.88 0.20 13.40 13.28 13.22 12.97 ··· 12.73 13.63 +0.36

Notes. Photometry follows Bonanos et al. (2009). The primary source for the B, V photometry is Selman et al. (1999); their observations were obtained over only ~10 min, so the (BV) colours are insensitive to orbital variability. JHK results are from IRSF (the InfraRed Survey Facility; Kato et al. 2007), and the mid-IR photometry from Spitzer “SAGE” Legacy Science Program (Meixner et al. 2006). Measurement uncertainties are 005, excepting the [5.8] magnitude for VFTS 450 (±015), but both stars are variable with amplitudes of ~02 (Fig. 5). The last two columns are average results from our OGLE photometry (Sect. 2.2.1).

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