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Table A.1

Equivalent widths (in Å) and equivalent width ratios as measured for the O-type stars in our sample.

Star He I λ4471  He II λ4541  He I λ4143  Si IV λ4089 log EW(4686) a log Wb log W′′c Quant. class.

HD 64568 0.84 –0.46
HD 93204 0.34 0.81 –0.17 −0.38 O5.5 V
HD 93843 0.30 0.70 –0.72 −0.37 O5.5 III
CPD −59 2600 0.43 0.63 –0.24 −0.17 O6.5 V/III
HD 63005 0.59 0.80 –0.12 −0.13 O6.5 V
HD 152723 0.45 0.60 –0.36 −0.12 O6.5 III
HD 93160 0.55 0.62 0.15 0.17 −0.05 0.05 O7 V
HD 94963 0.59 0.61 0.11 0.23 −0.01 0.32 O7-7.5 I/III
CPD −58 2620 0.64 0.76 0.12 0.22 −0.07 0.26 O7 III
HD 69464 0.64 0.66 0.10 0.19 −0.01 0.28 O7-7.5 III
HD 93222 0.60 0.65 0.12 0.23 −0.03 0.28 O7 III
HD 91824 0.58 0.75 0.13 0.15 –0.05 −0.11 O6.5 V
CD −43 4690 0.47 0.75 0.08 0.16 –0.23 −0.20 O6.5 V/III
HD 92504 0.87 0.42 0.29 0.37 0.32 0.11 O9 III/V
HD 151003 0.78 0.37 0.25 0.44 0.32 0.24 O9 III
HD 152247 0.86 0.35 0.30 0.47 0.39 0.19 O9 III
HD 302505 0.79 0.55 0.22 0.37 0.16 0.22 O8 III
CPD −44 4865 0.89 0.22 0.32 0.50 0.61 0.19 O9.5 III
HD 69106 0.95 0.17 0.74 O9.7

Notes. Accuracy of individual equivalent width measurements: 0.02 to 0.07 dex, depending on the strength of the line (the stronger the line, the higher the accuracy). Quantitative classification accounting for the error in log W′ (~±0.03 dex) and log W′′(≤±0.05 dex).

(a)

log EW(λ 4686) determines the luminosity class for stars of spectral types O6.5 and earlier (see Mathys 1988).

(b)

log W′ = log EW (HeIλ4471) − log EW(HeIIλ4541) determines the spectral type (see Conti & Alschuler 1971 and Mathys 1988).

(c)

log   W”= log EW (HeIλ4143) − log EW (SiIVλ4089) determines the luminosity class for stars of O7 and later (Conti & Alschuler 1971).

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