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Table A.1

Spectroscopic parameters for the O stars analyzed in this work and for which high-resolution spectra are available.

Name SpT Sp source Line vsini [km s−1] vmac [km s−1] Teff [kK] log g [dex] log gtrue [dex] −log Q [dex] Y(He) [10−2 dex]
HD 93 250 A,B O4 IV (fc) LiLiMaRlin- OWN O III 70 84 45.0±0.8 3.86±0.07 3.86−0.07+0.07$3.86_{ - 0.07}^{ + 0.07}$ 12.51±0.21 10.4±2.5
HD 93 160 A,B O7 III ((f)) LiLiMaRlin- OWN O III 120 64 36.6±0.7 3.79±0.12 3.80−0.12+0.12$3.80_{ - 0.12}^{ + 0.12}$ 12.65±0.10 <6.8
HD 93 222 A,B O7 V ((f)) LiLiMaRlin- OWN O III 50 90 36.9±0.5 3.68±0.05 3.68−0.05+0.05$3.68_{ - 0.05}^{ + 0.05}$ 12.98±0.25 10.3±2.5
HDE 303 308 A,B O4.5 V ((fc)) LiLiMaRlin- OWN O III 85 67 41.2±0.9 3.90±0.07 3.90−0.07+0.07$3.90_{ - 0.07}^{ + 0.07}$ 12.74±0.20 <6.9
HD 93 249 A O9 III GES - UVES O III 106 53 32.1±1.0 3.41±0.11 3.42−0.11+0.11$3.42_{ - 0.11}^{ + 0.11}$ 12.96±0.45 <7.9
HD 93 028 O9 IV LiLiMaRlin- OWN O III 25 55 35.0±0.5 3.87±0.06 3.87−0.06+0.06$3.87_{ - 0.06}^{ + 0.06}$ 13.30±0.33 9.5±2.5
HD 93 146 A O7 V ((f)) LiLiMaRlin- OWN O III 60 67 38.6±0.7 3.85±0.08 3.85−0.08+0.08$3.85_{ - 0.08}^{ + 0.08}$ 12.88±0.25 <10.3
HD 93 204 O5.5 V ((f)) GES - UVES O III 112 98 38.9±0.5 3.61±0.07 3.62−0.07+0.07$3.62_{ - 0.07}^{ + 0.07}$ 12.95±0.25 13.5±2.8
HDE 305 523 O9 II-III LiLiMaRlin- OWN O III 57 78 32.6±0.5 3.47±0.06 3.47−0.06+0.06$3.47_{ - 0.06}^{ + 0.06}$ 12.90±0.25 9.9±2.5
CPD -59 2600 O6V ((f)) GES - UVES O III 121 112 38.2±0.6 3.84±0.07 3.85−0.07+0.07$3.85_{ - 0.07}^{ + 0.07}$ 12.75±0.25 <6.8
HD 93 161 B O6.5 IV ((f)) GES - UVES O III 100 105 38.1±1.1 3.72±0.13 3.73−0.13+0.13$3.73_{ - 0.13}^{ + 0.13}$ 12.65±0.11 9.9±3.0
HD 93 128 O3.5 V ((fc))z LiLiMaRlin- OWN O III 58 56 49.0±2.0 4.03±0.09 4.03−0.09+0.09$4.03_{ - 0.09}^{ + 0.09}$ 12.72±0.22 10.1±2.5
HD 93 027 O9.5 IV GES - UVES O III 49 56 34.1±0.5 4.03±0.09 4.03−0.09+0.09$4.03_{ - 0.09}^{ + 0.09}$ 12.93±0.25 9.5±2.5
HD 93 129 B O3.5 V ((f))z LiLiMaRlin- OWN O III 66 62 46.8±1.2 3.93±0.06 3.93−0.06+0.06$3.93_{ - 0.06}^{ + 0.06}$ 12.75±0.26 10.3±2.5
HDE 303 311 O6 V ((f))z LiLiMaRlin- OWN O III 47 61 40.7±0.7 3.98±0.09 3.98−0.09+0.09$3.98_{ - 0.09}^{ + 0.09}$ 13.72±0.99 10.4±2.5
HDE 305 524 O6.5 V n((f))z GES - UVES O III 308 110 36.8±0.6 3.57±0.06 3.65−0.05+0.07$3.65_{ - 0.05}^{ + 0.07}$ >12.71 11.1±2.5
CPD -59 2551 O9 V LiLiMaRlin- OWN O III 124 92 34.8±0.5 3.89±0.05 3.90−0.05+0.05$3.90_{ - 0.05}^{ + 0.05}$ 13.75±0.61 10.8±2.5
CPD -58 2611 O6 V ((f))z LiLiMaRlin- OWN O III 39 73 40.0±0.5 3.90±0.05 3.90−0.05+0.05$3.90_{ - 0.05}^{ + 0.05}$ 13.36±0.54 10.4±2.5
CPD -59 2624 O9.7 V GES - Giraffe Si III 20 30 32.5±0.9 4.10±0.15 4.10−0.15+0.15$4.10_{ - 0.15}^{ + 0.15}$ <13.52 <7.9
CPD -59 2626 A,B O7.5 V (n) GES - Giraffe He I 265 130 36.0±0.5 3.80±0.06 3.84−0.05+0.06$3.84_{ - 0.05}^{ + 0.06}$ 13.69±0.70 <6.8
ALS 15 196 O8.5 V LiLiMaRlin- OWN O III 66 41 36.3±0.5 4.03±0.05 4.03−0.05+0.05$4.03_{ - 0.05}^{ + 0.05}$ 13.19±0.25 10.0±2.5
CPD -59 2644 O9 V GES - Giraffe Si III 156 8 34.1±0.5 3.89±0.05 3.90−0.05+0.05$3.90_{ - 0.05}^{ + 0.05}$ >13.52 10.4±2.5
HDE 305 532 O6.5 V ((f))z LiLiMaRlin- OWN O III 51 53 39.0±0.5 3.80±0.05 3.80−0.05+0.05$3.80_{ - 0.05}^{ + 0.05}$ 13.30±0.48 10.8±2.5
CPD -59 2627 O9.5 IV GES - Giraffe Si III 23 38 34.7±0.7 4.00±0.13 4.00−0.13+0.13$4.00_{ - 0.13}^{ + 0.13}$ 13.44±0.46 9.5±2.5
CPD -58 2627 O9.5 V (n) GES - Giraffe Si III 306 15 33.1±0.5 3.93±0.10 3.97−0.09+0.09$3.97_{ - 0.09}^{ + 0.09}$ >13.32 14.2±2.5
CPD -59 2673 O5.5 V (n)((f))z GES - Giraffe He I 258 12 40.6±0.8 3.78±0.05 3.82−0.05+0.05$3.82_{ - 0.05}^{ + 0.05}$ >12.65 9.5±2.5
ALS 15 210 O3.5 I f*Nwk GES - Giraffe N V 93 84 38.8±1.1 3.58±0.11 3.59−0.11+0.11$3.59_{ - 0.11}^{ + 0.11}$ 12.47±0.14 <9.2
CPD -58 2625 O9.5 V GES - Giraffe Si III 27 58 34.7±0.7 3.99±0.14 3.99−0.14+0.14$3.99_{ - 0.14}^{ + 0.14}$ >12.95 10.2±2.5
CPD -59 2629 O8.5 Vp GES - Giraffe Si III 15 20 37.5±0.8 >4.10 >4.0 12.75±0.27 <6.8
ARV2008-206 O6V ((f)) GES - Giraffe He I 134 5 40.2±1.2 3.96±0.10 3.97−0.10+0.10$3.97_{ - 0.10}^{ + 0.10}$ >12.98 <12.0
Tyc 8626-02506-1 O9 V (n) GES - Giraffe He I 223 0 35.7±0.8 4.15±0.16 4.11−0.15+0.16$4.11_{ - 0.15}^{ + 0.16}$ >13.44 10.6±2.5
2MASS J10460477-5949217 O9.7 V (n) GES - Giraffe Si III 233 10 31.6±0.7 4.15±0.11 4.16−0.11+0.11$4.16_{ - 0.11}^{ + 0.11}$ >13.07 10.7±2.5
2MASS J10453807-5944095 O8 V z GES - Giraffe He I 30 57 36.8±1.2 4.00±0.23 4.00−0.23+0.23$4.00_{ - 0.23}^{ + 0.23}$ >12.90 10.0±2.5
ESK2003-148 O9.2 V (n) GES - Giraffe He I 216 207 33.3±3.1 3.80±0.40 3.82−0.38+0.38$3.82_{ - 0.38}^{ + 0.38}$ >12.88 <22.0
2MASS J10443089-5914461 O7.5 II (f) GES - Giraffe He I 110 100 34.9±2.0 3.54±0.25 3.55−0.24+0.24$3.55_{ - 0.24}^{ + 0.24}$ 12.67±0.17 11.9±5.1
2MASS J10453185-6000293 O8.5 V GES - Giraffe He I 183 91 34.8±3.7 3.80±0.30 3.82−0.29+0.29$3.82_{ - 0.29}^{ + 0.29}$ >12.93 <17.0
HD 93 130 O6.5 III (f) LiLiMaRlin- OWN O III 74 70 38.1±0.5 3.86±0.09 3.86−0.09+0.09$3.86_{ - 0.09}^{ + 0.09}$ 12.65±0.10 <6.8

Notes: Uncertainties for vsini are in the range 10-20%. Column labeled ’Line’ indicates the line used to derive the rotational parameters.

Lines O III: O III 5592; Si III: Si III 4552; He I: He I 4713,4471; He II: He II 4542; Nv: N v 4603, 4620 gtrue = g + gcent = g + ( Vrotsini)2 / R*.

ARV2008-217 (an O3: III:(n) star, see Berlanas et al. (2023)) has been not included in the analysis due to its noisy spectrum.

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