X-Shooting ULLYSES: Massive stars at low metallicity - IV. Spectral analysis methods and exemplary results for O stars

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Volume 689 (September 2024)

A&A, 689 (2024) A30

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Table C.3

Best-fit parameters for the O9 Ia star Sk -66° 171 derived with the different methods. Adopted values are in italics.

Sk-66° 171	F1	F2	F3^‡	F4	C1	C2	P2
T_eff (kK)	31.1 ± 0.5	31.25 ± 1.00	${32.25}_{- 1.75}^{+ 0.75}$ $32.25_{ - 1.75}^{ + 0.75}$	${29.1}_{- 0.7}^{+ 2.0}$ $29.1_{ - 0.7}^{ + 2.0}$	30.0 ± 1.0	30.3 ± 0.2	${29.3}_{- 1}^{+ 1}$ $29.3_{ - 1}^{ + 1}$
log g (cms⁻²)	3.11 ± 0.05	${3.05}_{- 0.13}^{+ 0.05}$ $3.05_{ - 0.13}^{ + 0.05}$	${3.20}_{- 0.13}^{+ 0.48}$ $2.9_{ - 0.1}^{ + 0.2}$	${2.9}_{- 0.1}^{+ 0.2}$ $3.08_{ - 0.10}^{ + 0.15}$	3.0 ± 0.1	3.15	${3.08}_{- 0.10}^{+ 0.15}$ $5.75_{ - 0.04}^{ + 0.04}$
log L (L_⊙)	5.73 ± 0.01	${5.75}_{- 0.04}^{+ 0.04}$ $5.80_{ - 0.07}^{ + 0.03}$	${5.80}_{- 0.07}^{+ 0.03}$ $5.64_{ - 0.08}^{ + 0.14}$	${5.64}_{- 0.08}^{+ 0.14}$ $5.7_{ - 0.1}^{ + 0.1}$	5.71 ± 0.02	5.72 ± 0.02	${5.7}_{- 0.1}^{+ 0.1}$ $25.9_{ - 0.9}^{ + 1.0}$
R_2/3 (R_⊙)	25.3 ± 0.3	${25.9}_{- 0.9}^{+ 1.0}$ $25.8_{ - 0.9}^{ + 1.1}$	${25.8}_{- 0.9}^{+ 1.1}$ $22.1_{ - 2.7}^{ + 6.3}$	${22.1}_{- 2.7}^{+ 6.3}$ $27.2_{ - 3}^{ + 2}$	26.5 ± 1.7	26.5	${27.2}_{- 3}^{+ 2}$ $27.4_{ - 5.7}^{ + 3.0}$
M_spec (M_⊙)	31 ± 1	${27.4}_{- 5.7}^{+ 3.0}$ $40.4_{ - 7.4}^{ + 67.9}$	${40.4}_{- 7.4}^{+ 67.9}$ $14_{ - 6}^{ + 9}$	$14_{- 6}^{+ 9}$ $33.2_{ - 7}^{ + 9}$	25.6 ± 3.2	36.2	${33.2}_{- 7}^{+ 9}$ $1.6_{ - 0.3}^{ + 0.7}$
ß₁	≥ 1.1	1.0	${1.6}_{- 0.3}^{+ 0.7}$ $\log \dot M\left( {{M_ \odot }{\rm{y}}{{\rm{r}}^{ - 1}}} \right)$	1.0	1.3	2.0	1.1
ß₂	–	–	–	–	–	–	1.8
$\log \dot{M} (M_{⊙} {yr}^{- 1})$ $- 5.72_{ - 0.08}^{ + 0.05}$	−5.27 ± 0.10	$- {5.72}_{- 0.08}^{+ 0.05}$ $- 6.19_{ - 0.08}^{ + 0.55}$	$- {6.19}_{- 0.08}^{+ 0.55}$ $- 5.96_{ - 0.04}^{ + 0.5}$	–	$- {5.96}_{- 0.04}^{+ 0.5}$ $- 5.68_{ - 0.03}^{ + 0.03}$	$- {5.68}_{- 0.03}^{+ 0.03}$ $- 5.8_{ - 0.1}^{ + 0.1}$	$- {5.8}_{- 0.1}^{+ 0.1}$ $\log \left( {\dot M\sqrt {{f_{{\rm{cl}}}}} } \right)\left( {{M_ \odot }{\rm{y}}{{\rm{r}}^{ - 1}}} \right)$
$\log (\dot{M} \sqrt{f_{cl}}) (M_{⊙} {yr}^{- 1})$ $- 5.22_{ - 0.08}^{ + 0.05}$	−5.27 ± 0.10	$- {5.22}_{- 0.08}^{+ 0.05}$ $- 5.42_{ - 0.03}^{ + 0.03}$	−5.60	–	−5.37	$- {5.42}_{- 0.03}^{+ 0.03}$ $- 5.15_{ - 0.15}^{ + 0.15}$	$- {5.15}_{- 0.15}^{+ 0.15}$ $1850_{ - 100}^{ + 75}$
v_∞ (km s⁻¹)	1850	1876	$1850_{- 100}^{+ 75}$ $1800_{ - 200}^{ + 200}$	–	1700 ± 100	2000	$1800_{- 200}^{+ 200}$ $125_{ - 25}^{ + 10}$
v sin i (km s⁻¹ )	97 ± 10	$125_{- 25}^{+ 10}$ $410_{ - 20}^{ + 20}$	125	~100	98	90	98 ± 10
v_rad (km s⁻¹)	412	407 ± 16	408 ± 2	~420	410	~450	$410_{- 20}^{+ 20}$ $315_{ - 102}^{ + 37}$
v_mac (km s⁻¹)	30	0	0	20	20	0	10
ξ (km s⁻¹)	≥ 15	15	15	10	15	25 ± 5	18
v_windturb (km s⁻¹)	–	187	$315_{- 102}^{+ 37}$ $0.68_{ - 0.1}^{ + 0.04}$	–	250	–	180
X_h (mass fr.)	0.71	${0.68}_{- 0.1}^{+ 0.04}$ $0.6_{ - 0.1}^{ + 0.05}$	0.68	0.74	0.62	0.61	${0.6}_{- 0.1}^{+ 0.05}$ $0.31_{ - 0.04}^{ + 0.1}$
X_He (mass fr.)	0.28	${0.31}_{- 0.04}^{+ 0.1}$ $0.39_{ - 0.05}^{ + 0.1}$	0.31	0.26	0.37	0.38	${0.39}_{- 0.05}^{+ 0.1}$ $7_{ - 2}^{ + 37}$
X_c/10⁻⁴ (mass fr.)	4.3	$7_{- 2}^{+ 37}$ $15_{ - 8}^{ + 55}$	$15_{- 8}^{+ 55}$ $14_{ - 10}^{ + 12}$	–	10 ± 1	9 ± 1	8 ± 1
X_N/10⁻⁴ (mass fr.)	1.3	$14_{- 10}^{+ 12}$ $6.9_{ - 6.3}^{ + 7.7}$	${6.9}_{- 6.3}^{+ 7.7}$ $4.5_{ - 1.0}^{ + 2.9}$	–	${4.5}_{- 1.0}^{+ 2.9}$ $1.0_{ - 0.6}^{ + 6.4}$	13.8 ± 4.6	8 ± 2
X_O/10⁻³ (mass fr.)	2.5	${1.0}_{- 0.6}^{+ 6.4}$ $5.6_{ - 5.0}^{ + 2.8}$	${5.6}_{- 5.0}^{+ 2.8}$ $2.9_{ - 0.5}^{ + 1.0}$	–	${2.9}_{- 0.5}^{+ 1.0}$ $0.11_{ - 0.02}^{ + 0.06}$	1.39 ± 0.35	3.0 ± 0.5
y_He	0.10 ± 0.02	${0.11}_{- 0.02}^{+ 0.06}$ $7.95_{ - 0.05}^{ + 0.75}$	0.11	0.09	0.15 ± 0.01	0.155	0.164
ϵ_C	7.7	${7.95}_{- 0.05}^{+ 0.75}$ $8.25_{ - 0.30}^{ + 0.65}$	${8.25}_{- 0.30}^{+ 0.65}$ $8.15_{ - 0.55}^{ + 0.25}$	–	8.13	8.04	8.1
ϵ_N	7.1	${8.15}_{- 0.55}^{+ 0.25}$ $7.85_{ - 1.0}^{ + 0.30}$	${7.85}_{- 1.0}^{+ 0.30}$ $7.95_{ - 0.35}^{ + 0.85}$	–	7.71	8.2	8.0
ϵ_O	8 3	${7.95}_{- 0.35}^{+ 0.85}$ $8.70_{ - 0.95}^{ + 0.15}$	${8.70}_{- 0.95}^{+ 0.15}$ $49.30_{ - 0.04}^{ + 0.07}$	–	8.46	8.15	8.5
E_b–v (mag)	0.07	0.18	0.18	0.08	0.12	0.11	0.09
log (L_X/L)	–	−6.88	−6.91	–	−6.1	−7.25	−6.0
log Q_h (s⁻¹)	–	${49.30}_{- 0.04}^{+ 0.07}$ $49.31_{ - 0.14}^{ + 0.05}$	${49.31}_{- 0.14}^{+ 0.05}$ $47.97_{ - 0.09}^{ + 0.13}$	49.1	49.71	–	49.12
log Q_{He I} (s⁻¹)	–	${47.97}_{- 0.09}^{+ 0.13}$ $47.90_{ - 0.43}^{ + 0.13}$	${47.90}_{- 0.43}^{+ 0.13}$ $41.58_{ - 0.14}^{ + 0.09}$	47.6	48.3	–	47.15
log Q_{He II} (s⁻¹)	–	${41.58}_{- 0.14}^{+ 0.09}$ $41.64_{ - 0.15}^{ + 0.07}$	${41.64}_{- 0.15}^{+ 0.07}$ ${D_\infty }{\rm{ or }}{f_{{\rm{cl}}}}{\rm{ or }}f_{\rm{v}}^{ - 1}$	–	38.76	–	42.22
log Q_ws	−12.3 ± 0.1	−12.2	−12.6	−12.3	−12.4	−12.5	−12.2
$D_{\infty} or f_{cl} or f_{v}^{- 1}$ $20_{ - 10}^{ + 10}$ ^†	1	10		1	14	3.33	$20_{- 10}^{+ 10}$ $30_{ - 1}^{ + 2}$
v_cl (km s⁻¹)	–	–	–	–	30	10	–
v_cl,start (km s−¹)	–	94		–	–	–	–
R_D (R₂₀)	–	–	–	–	–	–	3
log f_ic	–	−1		–	–	–	–
f_vel	–	0.5		–	–	–	–
T₂₀ (kK)	–	–	–	–	–	30.8 ± 0.2	$30_{- 1}^{+ 2}$ $26.2_{ - 3}^{ + 2}$
R₂₀ (R_⊙)	–	–	–	–	–	25.6	${26.2}_{- 3}^{+ 2}$ ${D_\infty } = {f_{{\rm{cl}}}} = f_{\rm{V}}^{ - 1}$
T₁₀₀ (kK)	–	–	–	–		31.1 ± 0.2	–

Notes. ^(†)For optically thin clumping with no inter–clump medium: $D_{\infty} = f_{cl} = f_{V}^{- 1}$ ${f_{{\rm{cl}}}},\log \left( {\dot M\sqrt {{f_{{\rm{cl}}}}} } \right)$ (cf. Sect. 3.1.2) ^(‡)Three dots (…) indicate that a quantity is included as a free parameter, but cannot be constrained. For an unconstrained $f_{cl}, \log (\dot{M} \sqrt{f_{cl}})$ ${f_{{\rm{cl}}}},\log \left( {\dot M\sqrt {{f_{{\rm{cl}}}}} } \right)$ and log Q_ws are computed assuming f_cl = 15.

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