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Table 1

Observed and derived properties of W49nr1.

α(J2000) (h m s) 19:10:17.43
δ(J2000) (°′′) +9:06:20.93

J (mag) 16.57 ± 0.18
H(mag) 13.47 ± 0.12
K (mag) 11.93 ± 0.10

EW(Brγ) (Å) 8.2 ± 1.7
EW(He ii) (Å) 2.4 ± 0.7
EW(N iii) (Å) 2.3 ± 1.0
EW(N v) (Å) 2.6 ± 0.9

Spectral type O2-3.5If*
Teff (K) 40 000–50 000
BC (mag) –5.2 – –4.55

AK (mag) 2.9a/2.6–3.5b
Initial mass ( M) 100–180a/90–250b
Luminosity (L/ L) 1.7–3.1 × 106a/1.2–4.9 × 106b

Notes.

(a)

With extinction law of Indebetouw et al. (2005).

(b)

Considering other extinction laws (see text).

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