The Galactic WC and WO stars - The impact of revised distances from Gaia DR2 and their role as massive black hole progenitors

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Table 3.

Revised stellar parameters of the single Galactic WO stars based on the atmosphere models used in Tramper et al. (2015) and the Gaia DR2 based distances from Bailer-Jones et al. (2018).

	WR 93b	WR 102	WR 142
Subtype	WO3	WO2	WO2
T_*^a (kK)	160	210	200
υ_∞^a (km s⁻¹)	5000	5000	4900
X_He^a	0.29	0.14	0.26
X_C^a	0.53	0.62	0.54
X_O^a	0.18	0.24	0.21
R_* (R_⊙)	0.44	0.24	0.39
logL/L_⊙^b
log Ṁ/(M_⊙ yr⁻¹) ^b
M_*^b^, ^c (M_⊙)

Notes. The parameters for the two WO2 stars based on the spectral analysis from Sander et al. (2012) can be found in Table 1.

^(a)

Taken from Tramper et al. (2015).

^(b)

Errors based on uncertainties of Gaia DR2 parallaxes converted into distances by Bailer-Jones et al. (2018).

^(c)

Masses are calculated from luminosity after Langer (1989) using their M–L relation for WC stars.

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