Table 1: Characteristics of the O star sample. The spectral type is taken from Mason et al. (1998), except where indicated. The "observed'' absolute magnitude $M_V^{\rm H}$ is calculated from the Hipparcos parallax $\pi _{\rm H}$ (in mas), and is corrected for interstellar extinction ($A_{\rm V}$). The predicted absolute magnitude $M_V^{\rm SK}$ is derived from the spectral type according to the calibration of Schmidt-Kaler et al. (1982).
HD Sp. type $\pi_{\rm H} \pm \sigma_{\pi_{\rm H}}$ $A_{\rm V}$ $M_V^{\rm H}$ $M_V^{\rm SK}$   HD Sp. type $\pi_{\rm H} \pm \sigma_{\pi_{\rm H}}$ $A_{\rm V}$ $M_V^{\rm H}$ $M_V^{\rm SK}$
108 O7.5If1) $0.08 \pm 0.65$ 1.35 -9.5 -6.7   91452 O9.5Iab-Ib $-1.08 \pm 0.67$ 1.46   -6.3
1337 O9.5III $0.57 \pm 0.69$ 0.46 -5.0 -5.4   93206 O9.5I $1.23 \pm 0.86$ 1.08 -3.5 -6.5
5005 O6.5V $-0.81 \pm 1.71$ 1.19   -5.4   93403 O5.5I5) $1.13 \pm 0.61$ 1.65 -3.9 -6.8
13745 O9.7II((n)) $0.63 \pm 0.91$ 1.24 -4.4 -5.8   96670 O7V(f)n $0.82 \pm 0.73$ 1.42 -4.4 -5.2
14633 ON8V $1.10 \pm 0.85$ 0.36 -2.7 -4.9   96917 O8.5Ib(f) $-0.08 \pm 0.70$ 1.13   -6.2
14947 O5If+ $0.34 \pm 1.00$ 2.17 -6.5 -6.6   100099 O9III $0.02 \pm 0.75$ 1.28 -11.7 -5.6
15137 O9.5II-III(n) $0.37 \pm 0.87$ 0.90 -5.2 -5.6   101131 O6V((f)) $1.41 \pm 0.69$ 0.99 -3.1 -5.5
15558 O5III $2.01 \pm 1.34$ 2.46 -2.9 -6.3   101298 O6V((f)) $0.44 \pm 0.78$ 1.17 -4.9 -5.5
17505 O6.5V((f)) $1.98 \pm 1.17$ 2.02 -3.2 -5.4   101413 O8V $-0.70 \pm 2.86$ 1.22   -4.9
18326 O7V(n) $1.80 \pm 1.12$ 1.93 -2.7 -5.2   101436 O6.5V $-1.39 \pm 2.10$ 1.20   -5.4
19820 O8.5III $2.34 \pm 0.90$ 2.31 -3.2 -5.7   101545 O9.5Ib-II $1.16 \pm 1.12$ 0.79 -3.6 -6.0
24431 O9III $0.48 \pm 1.04$ 2.04 -6.8 -5.6   105056 ON9.7Iae $1.74 \pm 0.67$ 0.80 -2.2 -6.9
24912 O7.5III(n)((f)) $1.84 \pm 0.70$ 1.03 -5.7 -5.9   105627 O9II-III $0.03 \pm 1.29$ 0.93 -10.3 -5.8
25639 O9IV2) $3.03 \pm 5.60$ 2.12 -1.9 -5.2   112244 O8.5Iab(f) $1.73 \pm 0.57$ 0.90 -4.4 -6.5
30614 O9.5Ia $0.47 \pm 0.60$ 0.75 -8.1 -6.9   115071 O9Vn $-0.63 \pm 0.91$ 1.66   -4.5
34078 O9.5V $2.24 \pm 0.74$ 1.56 -3.8 -4.3   116852 O9III $1.07 \pm 0.79$ 0.65 -2.0 -5.6
34656 O7II(f) $-0.13 \pm 0.86$ 0.99   -6.0   117856 O9.5III $0.33 \pm 1.31$ 1.42 -6.4 -5.4
36486 O9.5IIn $3.65 \pm 0.83$ 0.39 -5.1 -5.8   122879 O9.5I $-0.05 \pm 0.76$ 1.03   -6.5
36861 O8III((f))3) $3.09 \pm 0.78$ 0.33 -4.3 -5.8   124314 O6V(n)((f)) $1.41 \pm 0.96$ 1.51 -3.9 -5.5
36879 O7V(n) $0.28 \pm 1.06$ 1.40 -6.6 -5.2   125206 O9.5IV(n) $1.32 \pm 0.94$ 1.54 -3.0 -5.0
37043 O9III $2.46 \pm 0.77$ 0.31 -5.3 -5.6   135240 O7III-V6) $0.51 \pm 0.71$ 0.75 -6.8 -5.5
37366 O9.5V $2.31 \pm 1.54$ 1.12 -1.6 -4.3   135591 O7.5III((f)) $0.02 \pm 0.71$ 0.70 -13.8 -5.9
37468 O9.5V $2.84 \pm 0.91$ 0.36 -4.0 -4.3   148546 O9Ia $1.67 \pm 1.12$ 1.73 -2.9 -6.8
37742 O9.7Ib $3.99 \pm 0.79$ 0.35 -5.5 -6.1   148937 O6.5f?p $0.61 \pm 1.31$ 1.97 -6.3 -6.7
38666 O9.5V $2.52 \pm 0.55$ 0.10 -2.9 -4.3   149038 O9.7Iab $0.70 \pm 0.73$ 0.89 -6.8 -6.4
39680 O6V(n)pe var $0.37 \pm 1.13$ 1.05 -5.3 -5.5   149404 O8.5I $1.07 \pm 0.89$ 1.83 -5.7 -6.5
41161 O8Vn $0.21 \pm 0.86$ 0.68 -7.3 -4.9   149757 O9.5Vn $7.12 \pm 0.71$ 1.06 -4.3 -4.3
42088 O6.5V $2.38 \pm 1.13$ 1.05 -1.6 -5.4   151003 O9II $0.32 \pm 0.91$ 1.52 -6.9 -5.9
46149 O8.5V $-0.15 \pm 1.23$ 1.28   -4.7   151515 O7II(f) $0.55 \pm 0.81$ 1.37 -5.5 -6.0
46150 O5V((f)) $1.97 \pm 0.88$ 1.29 -3.1 -5.7   151564 O9.5IV $1.35 \pm 1.20$ 1.13 -2.5 -5.0
46223 O4V((f)) $0.57 \pm 0.95$ 1.48 -5.4 -5.9   151804 O8Iaf $0.48 \pm 0.83$ 1.04 -7.4 -6.7
46573 O7III((f)) $0.83 \pm 1.11$ 1.91 -4.4 -5.9   152246 O9III-IV((n)) $-0.10 \pm 1.02$ 1.38   -5.4
46966 O8V $-1.22 \pm 0.96$ 0.79   -4.9   152270 O6V7) $-0.59 \pm 0.91$ 1.49   -5.5
47432 O9.7Ib $0.96 \pm 0.89$ 1.05 -6.1 -5.7   152405 O9.7Ib-II $-0.02 \pm 0.96$ 1.12   -5.9
47839 O7V((f)) $3.19 \pm 0.73$ 0.17 -2.9 -5.2   152408 O8Iafpe $0.34 \pm 0.73$ 1.31 -7.9 -6.7
48279 O8V $-0.66 \pm 1.32$ 1.16   -4.9   152424 OC9.7Ia $-0.15 \pm 0.86$ 1.98   -6.9
52266 O9IV(n) $2.06 \pm 0.91$ 0.85 -2.1 -5.2   152623 O7V(n)((f)) $-2.02 \pm 1.52$ 1.13   -5.2
53975 O7.5V $0.66 \pm 0.77$ 0.61 -5.0 -5.1   152723 O6.5III(f) $1.20 \pm 1.46$ 1.46 -3.8 -6.0
54662 O6.5V $0.56 \pm 0.81$ 0.95 -6.0 -5.4   153426 O9II-III $1.00 \pm 1.15$ 1.38 -3.9 -5.8
55879 O9.5II-III $1.34 \pm 0.71$ 0.88 -4.2 -5.6   153919 O6.5Iaf+ $-0.21 \pm 0.86$ 1.69   -6.7
57060 O7.5-O8Iabf $1.09 \pm 0.65$ 0.42 -5.0 -6.7   154368 O9.5Iab $2.73 \pm 0.96$ 2.13 -3.8 -6.5
57682 O9IV $-0.81 \pm 0.84$ 0.38   -5.2   154811 OC9.7Iab $2.38 \pm 0.94$ 1.76 -3.0 -6.4
60369 O9IV $0.52 \pm 1.46$ 0.84 -4.1 -5.2   155806 O7.5V(n)e $0.73 \pm 0.77$ 0.82 -5.9 -5.1
60848 O8Vpe $2.01 \pm 0.94$ 0.33 -1.9 -4.9   155889 O9IV $0.61 \pm 0.74$ 0.91 -5.0 -5.2
61827 O8V4) $0.63 \pm 0.75$ 2.67 -6.0 -4.9   156212 O9.7Iab $0.51 \pm 1.10$ 2.37 -5.9 -6.4
66811 O4I(n)f $2.33 \pm 0.51$ 0.13 -6.1 -6.5   156292 O9.5III $0.69 \pm 1.01$ 1.73 -5.0 -5.4
68273 O8III $3.88 \pm 0.53$ 0.51 -5.6 -5.8   158186 O9.5V $0.20 \pm 0.95$ 0.89 -7.3 -4.3
68450 O9.7Ib-II $1.33 \pm 0.56$ 0.70 -3.7 -5.9   159176 O7V $0.96 \pm 1.59$ 1.13 -4.7 -5.2
71304 O9.5Ib $-0.66 \pm 1.75$ 2.45   -6.2   162978 O7.5II((f)) $-0.40 \pm 0.85$ 0.98   -6.0
73882 O8.5V((n)) $2.00 \pm 1.18$ 2.19 -3.2 -4.7   163800 O7III((f)) $-0.18 \pm 0.97$ 1.71   -5.9
74194 O8.5Ib(f) $0.36 \pm 0.64$ 1.43 -6.1 -6.2   163892 O9IV((n)) $0.38 \pm 1.02$ 1.30 -5.9 -5.2
75211 O9Ib $0.90 \pm 0.68$ 1.87 -4.6 -6.2   164438 O9III $-0.30 \pm 1.17$ 1.73   -5.6
75222 O9.7Iab $1.97 \pm 0.70$ 1.68 -2.8 -6.4   164492 O7.5III((f)) $-3.59 \pm 2.32$ 0.80   -5.9
75759 O9V $1.71 \pm 0.53$ 0.61 -2.7 -4.5   164794 O4V((f)) $0.66 \pm 1.01$ 1.12 -6.1 -5.9
76341 O9Ib $0.82 \pm 0.62$ 1.62 -4.9 -6.2   165052 O6.5V $2.27 \pm 1.13$ 1.25 -2.0 -5.4
76968 O9.7Ib $-0.07 \pm 0.57$ 1.15   -6.1   165319 O9.5Iab $1.40 \pm 1.02$ 2.55 -3.9 -6.5
89137 O9.5IIInp $-1.39 \pm 0.78$ 0.80   -5.4   165921 O7V $1.85 \pm 1.05$ 1.24 -2.2 -5.2
166546 O9.5II-III $0.05 \pm 0.96$ 0.96 -10.2 -5.6   193793 O4-5V8) $0.62 \pm 0.62$ 2.45 -6.2 -5.8
167263 O9.5II-III((n)) $-0.22 \pm 0.91$ 0.86   -5.6   195592 O9.7Ia $0.92 \pm 0.62$ 3.38 -6.5 -6.9
167264 O9.7Iab $-0.33 \pm 0.93$ 0.77   -6.4   198846 O9V $1.04 \pm 0.82$ 0.68 -2.6 -4.5
167633 O6V((f)) $2.21 \pm 1.17$ 1.64 -1.8 -5.7   199579 O6V $0.83 \pm 0.61$ 1.09 -5.5 -5.5
167771 O7III(n)((f)) $0.49 \pm 1.00$ 1.13 -5.5 -5.9   201345 ON9V $0.61 \pm 0.77$ 0.51 -3.8 -4.5
167971 O8Ib(f)p $1.30 \pm 1.07$ 2.94 -5.0 -6.2   202124 O9.5Iab $-0.62 \pm 0.74$ 1.42   -6.5
175754 O8II((f)) $-0.13 \pm 0.97$ 0.64   -6.0   203064 O7.5IIIn((f)) $-0.05 \pm 0.55$ 0.79   -5.9
175876 O6.5III(n) $0.27 \pm 0.86$ 0.60 -6.5 -6.0   204827 O9.5V $0.97 \pm 0.79$ 3.44 -5.6 -4.3
186980 O7.5III((f)) $-0.01 \pm 0.75$ 1.08   -5.9   206183 O9.5V $2.00 \pm 0.97$ 1.17 -2.2 -5.4
188001 O7.5Iaf $0.28 \pm 0.70$ 0.83 -7.4 -6.7   207198 O9Ib-II $1.62 \pm 0.48$ 1.88 -4.9 -6.1
188209 O9.5Iab $0.22 \pm 0.48$ 0.53 -8.2 -6.5   207538 O9.5V $0.30 \pm 0.62$ 1.81 -7.1 -4.3
189957 O9.5III $-0.70 \pm 0.60$ 0.87   -5.4   209481 O8.5III $0.70 \pm 0.46$ 1.01 -5.7 -5.7
190429 O4If+ $0.03 \pm 1.02$ 1.42 -11.9 -6.5   209975 O9.5Ib $0.60 \pm 0.49$ 1.55 -7.6 -6.2
190864 O6.5III(f) $0.67 \pm 0.76$ 1.42 -4.5 -6.0   210809 O9Ib $-0.19 \pm 0.66$ 0.90   -6.2
191612 O6.5f?pe $0.11 \pm 0.74$ 1.60 -8.6 -6.7   210839 O6I(n)f $1.98 \pm 0.46$ 1.56 -5.0 -6.6
192281 O5Vn((f))p $1.85 \pm 0.67$ 1.98 -3.1 -5.7   214680 O9V $3.08 \pm 0.62$ 0.32 -3.0 -4.5
192639 O7Ib(f) $1.22 \pm 0.64$ 1.83 -4.3 -6.3   215835 O6V $-0.79 \pm 1.00$ 2.06   -5.5
193322 O9V((n)) $2.10 \pm 0.61$ 1.19 -3.6 -4.5   217086 O7Vn $1.20 \pm 0.92$ 2.75 -4.7 -5.2
193443 O9III $1.23 \pm 0.65$ 1.98 -3.7 -5.6   218915 O9.5Iab $0.48 \pm 0.75$ 0.69 -5.1 -6.5
193514 O7Ib(f) $0.41 \pm 0.69$ 2.18 -6.7 -6.3   226868 O9.7Iab $0.58 \pm 1.01$ 3.01 -5.4 -6.4
References: 1) Nazé et al. (2001); 2) Lorenz et al. (1998); 3) Walborn (1972); 4) Goy (1973);
5) Rauw et al. (2000); 6) Penny et al. (2001); 7) Luehrs (1997); 8) Setia Gunawan et al. (2001).


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