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Table 1

Stellar parameters of the most massive stars in the Arches cluster.

Star Subtype T⋆ L log (Ṁ) MHeb Mhom Mw2 Mw1
[kK] [L⊙] [] [km s-1] [%] [M⊙] [M⊙] [M⊙] [M⊙]
F8 WN8-9 33.7 6.10  −4.50 1000 0.18 1.64 37.1 55.5 51.0 43.3 0.63 0.42 0.46 0.54
F5 WN8-9 35.8 5.95  −4.64 900 0.22 1.95 29.5 47.3 36.5 31.1 0.58 0.36 0.46 0.54
F3 WN8-9 29.9 6.10  −4.60 800 0.27 2.79 37.1 62.7 63.2 52.4 0.68 0.40 0.40 0.48
F4 WN7-8 37.3 6.30  −4.35 1400 0.36 2.10 51.0 93.6 75.7 66.4 0.83 0.45 0.56 0.64
F2 WN8-9 34.5 6.00  −4.72 1400 0.40 1.43 31.8 63.3 49.2 41.6 0.68 0.34 0.44 0.52
F7 WN8-9 33.7 6.30  −4.60 1300 0.43 1.86 51.0 101.2 102.3 86.3 0.88 0.44 0.44 0.52
F6 WN8-9 34.7 6.35  −4.62 1400 0.54 1.14 55.4 121.8 119.2 101.0 0.97 0.44 0.45 0.53
F12 WN7-8 37.3 6.20  −4.75 1500 0.54 2.26 43.4 97.5 82.1 70.0 0.87 0.39 0.46 0.54
B1 WN8-9 32.2 5.95  −5.00 1600 0.69 2.41 29.5 82.0 60.4 49.8 0.80 0.29 0.39 0.47
F1 WN8-9 33.7 6.30  −4.70 1400 0.69 1.45 51.0 133.0 119.4 100.9 1.03 0.40 0.44 0.52
F9 WN8-9 36.8 6.35  −4.78 1800 0.69 1.46 55.4 143.6 131.3 111.3 1.07 0.41 0.45 0.53
F14 WN8-9 34.5 6.00  −5.00 1400 0.69 0.49 31.8 87.4 64.8 54.0 0.83 0.30 0.41 0.49
F16 WN8-9 32.4 5.90  −5.11 1400 0.69 1.46 27.4 76.9 56.0 45.9 0.76 0.27 0.37 0.46
F10 O4-6If 32.4 5.95  −5.30 1600 0.69 0.39 29.5 82.0 69.1 55.3 0.80 0.29 0.34 0.42
F15 O4-6If 35.8 6.15  −5.10 2400 0.69 0.49 40.1 107.0 96.9 79.7 0.93 0.35 0.38 0.47
F18 O4-6I 37.3 6.05  −5.35 2150 0.69 0.39 34.3 93.3 82.5 66.9 0.86 0.32 0.36 0.44
F20 O4-6I 38.4 5.90  −5.42 2850 0.69 0.30 27.4 76.9 57.4 46.7 0.76 0.27 0.36 0.45
F21 O4-6I 35.8 5.95  −5.49 2200 0.69 0.39 29.5 82.0 70.2 56.0 0.80 0.29 0.33 0.42
F22 O4-6I 35.8 5.80  −5.70 1900 0.69 0.39 23.7 68.0 52.5 41.3 0.70 0.24 0.32 0.40
F23 O4-6I 35.8 5.80  −5.65 1900 0.69 0.69 23.7 68.0 51.5 40.7 0.70 0.24 0.32 0.41
F26 O4-6I 39.8 5.85  −5.73 2600 0.69 0.40 25.5 72.3 56.6 45.0 0.73 0.26 0.33 0.42
F28 O4-6I 39.8 5.95  −5.70 2750 0.69 0.40 29.5 82.0 71.5 56.8 0.80 0.29 0.33 0.41
F29 O4-6I 35.7 5.75  −5.60 2900 0.69 0.30 22.1 64.1 44.8 35.6 0.67 0.23 0.33 0.42
F32 O4-6I 40.8 5.85  −5.90 2400 0.69 0.29 25.5 72.3 59.3 46.6 0.73 0.26 0.31 0.40
F33 O4-6I 39.8 5.85  −5.73 2600 0.69 0.39 25.5 72.3 56.6 45.0 0.73 0.26 0.33 0.42
F34 O4-6I 38.1 5.75  −5.77 1750 0.69 0.40 22.1 64.1 46.0 36.3 0.67 0.23 0.32 0.40
F35 O4-6I 33.8 5.70  −5.76 2150 0.69 0.20 20.6 60.5 43.1 33.6 0.64 0.22 0.31 0.39
F40 O4-6I 39.8 5.75  −5.75 2450 0.69 0.40 22.1 64.1 44.5 35.5 0.67 0.23 0.33 0.42

Notes. Designations, subtypes, stellar temperatures (T⋆), luminosities (L), mass-loss rates (Ṁ), terminal wind velocities , hydrogen, and nitrogen surface mass fractions (, ), from Martins et al. (2008), and mass estimates from the present work: He-burning masses (MHeb), and homogeneous masses (Mhom) according to Eqs. (11–13), with coefficients from rows 11, and 16 in Table A.1, wind masses according to Gräfener & Hamann (2008) for Z = 2Z⊙ (Mw2), and Z = 1Z⊙ (Mw1). The corresponding Eddington factors Γe are given in the last four columns.

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