Comprehensive UV and optical spectral analysis of Cygnus X-1 - Stellar and wind parameters, abundances, and evolutionary implications

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Table 8

Parameters of MESA Models with different mass-loss scaling factors compared to the observed values of the donor in Cyg X-1.

Parameterf_wind	M1 1	M2 0.5	M3 Observation 0.2
T_eff (kK)	28.6	29.1	29.3	${28.5}_{- 1}^{+ 1}$ $28.5_{ - 1}^{ + 1}$
log L (L_⊙)	5.41	5.46	5.47	${5.5}_{- 0.1}^{+ 0.1}$ $5.5_{ - 0.1}^{ + 0.1}$
log g	3.29	3.29	3.30	3.2 ${3.2}_{- 0.1}^{+ 0.1}$ $3.2_{ - 0.1}^{ + 0.1}$
R (R⊙)	20.58	21.21	21.20	${22.3}_{- 2.5}^{+ 1.5}$ $22.3_{ - 2.5}^{ + 1.5}$
M_donor (M_⊙)	30.4	32.6	33.4	$29_{- 3}^{+ 6}$ $29_{ - 3}^{ + 6}$
M_BH (M_⊙)	17.58	17.49	17.43	${17.5}_{- 1}^{+ 2}$ $17.5_{ - 1}^{ + 2}$
P_orb (days)	5.589	5.590	5.501	5.599
f_RL	0.99	0.99	0.99	${1.1}_{- 0.2}^{+ 0.15}$ $1.1_{ - 0.2}^{ + 0.15}$
$\log \dot{M} (M_{⊙} {yr}^{- 1})$ $\log \dot M({M_ \odot }{\rm{y}}{{\rm{r}}^{ - 1}})$	−6.34	−6.49	−6.85	$- {6.5}_{- 0.2}^{+ 0.2}$ $- 6.5_{ - 0.2}^{ + 0.2}$

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