Table 2
Derived mass loss from optical studies and estimates, from different prescriptions, of the hot mass loss derived with our X-ray data.
| Target name | log (Ṁliterature) | log (ṀVink + 01) | EM | log (ṀHuenemoerder + 12) | log (ṀCohen + 08) | ||||||||
| (M⊙ yr-1) | (M⊙ yr-1) | (1052 cm-3) | (M⊙ yr-1) | (M⊙ yr-1) | |||||||||
| Low Teff | High Teff | ||||||||||||
|
|
|||||||||||||
| HD 34816 | −8.50 ± 0.06 | 74.1 ± 4.2 | <–8.1 to <–7.6 | <–8.0 to <–7.6 | |||||||||
| HD 35468 | −8.33 ± 0.09 | 2.20 ± 0.07 | –10.0 to –8.4a | –9.3 to –8.4a | |||||||||
| HD 36512 | −6.22 ± 0.06 | 2466 ± 344 | <–7.2 to <–6.7 | <–7.1 to <–6.6 | |||||||||
| HD 36960 | −7.79 ± 0.07 | 159 ± 23 | <–7.8 to <–7.3 | <–7.8 to <–7.3 | |||||||||
| HD 38771 | −6.05 [1],  [2] |
−6.80 ± 0.08 | −8.01 ± 0.07 | 252 ± 21 | –7.7 to –7.2 | –7.6 to –7.2 | |||||||
| HD 44743 | −7.33 ± 0.08 | −8.55 ± 0.08 | 26.1 ± 0.8 | <–8.6 to <–8.2 | <–8.5 to <–8.0 | ||||||||
| HD 52089 | −9 [3],−8 [4] | −7.53 ± 0.08 | 28.9 ± 0.8 | –8.3 to –7.8 | –8.3 to –7.8 | ||||||||
| HD 63922 | −6.93 ± 0.06 | 460 ± 16 | <–7.6 to <–7.1 | <–7.6 to <–7.1 | |||||||||
| HD 79351 | −8.71 ± 0.10 | 25.9 ± 0.6 | –9.5 to –7.9 a | –8.7 to –7.8a | |||||||||
| HD 144217 | −8.04 ± 0.06 | 59.1 ± 2.3 | <–8.1 to <–7.7 | <–8.1 to <–7.6 | |||||||||
| HD 158926 | −6.50 ± 0.08 | 19.8 ± 1.5 | –8.2 to –7.7 | –8.1 to –7.7 | |||||||||
Notes. The second column lists the mass-loss rate value derived in recent optical studies using atmosphere models: [1]: Crowther et al. (2006), [2]: Searle et al. (2008), [3]: Hamann et al. (priv. comm.; Fossati et al. 2015), [4]: Najarro et al. (1996). The third and fourth columns provide the mass-loss estimates from the formulae of Vink et al. (2001) when the adopted Teff is in the range 12 500−22 500 K (cool side of the bi-stability jump) and 27 500−50 000 K (hot side of the bi-stability jump), respectively. When the adopted Teff (Table A.1) is in the range 22 500−27 500 K (in the bi-stability jump), mass-loss estimates for both the cool and hot sides of the bi-stability jump are provided. The fifth column yields the total X-ray emission measures, estimated from the normalisation factors of the spectral fittings (Table 1). The last two columns provide the mass-loss rates predicted by Eq. (1) of Huenemoerder et al. (2012, with b = 0.97 and the formula on p. 1868 of Cohen et al. (2008), respectively. In these columns only a range of mass-loss rates are given: the lower values correspond to a terminal wind velocity of 500 km s-1, while the highest values correspond to a terminal wind velocity of 1500 km s-1.
These values were derived assuming Rfir = 1 to 7 R⋆, which is in line with the formation radii derived in Sect. 3.1.
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