X-Shooting ULLYSES: Massive stars at low metallicity - VIII. Stellar and wind parameters of newly revealed stripped stars in Be binaries

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Volume 692 (December 2024)

A&A, 692 (2024) A90

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Table 4.

Fundamental parameters and abundances derived for Sk −71° 35.

	Stripped star	Oe star
Spectral type	B1 Ia	O9 Ve
T_* (kK)	$21_{- 2}^{+ 2}$ $21^{+2}_{-2}$	$32_{- 3}^{+ 3}$ $32^{+3}_{-3}$
T_2/3 (kK)	$20_{- 2}^{+ 2}$ $20^{+2}_{-2}$	$31 . 8_{- 3}^{+ 3}$ $31.8^{+3}_{-3}$
log g_* (cm s⁻²)	$2 . 6_{- 0.2}^{+ 0.2}$ $2.6^{+0.2}_{-0.2}$	$3 . 8_{- 0.2}^{+ 0.2}$ $3.8^{+0.2}_{-0.2}$
log g_2/3 (cm s⁻²)	$2 . 51_{- 0.2}^{+ 0.1}$ $2.51^{+0.1}_{-0.2}$	$3 . 79_{- 0.2}^{+ 0.2}$ $3.79^{+0.2}_{-0.2}$
log g_true ^( † ) (cm s⁻²)	$2 . 65_{- 0.2}^{+ 0.1}$ $2.65^{+0.1}_{-0.2}$	$3 . 85_{- 0.2}^{+ 0.2}$ $3.85^{+0.2}_{-0.2}$
log L (L_⊙)	$4 . 93_{- 0.1}^{+ 0.1}$ $4.93^{+0.1}_{-0.1}$	$5 . 12_{- 0.2}^{+ 0.2}$ $5.12^{+0.2}_{-0.2}$
R_* (R_⊙)	$22 . 1_{- 2}^{+ 2}$ $22.1^{+2}_{-2}$	$11 . 8_{- 2}^{+ 2}$ $11.8^{+2}_{-2}$
R_2/3 (R_⊙)	$24 . 3_{- 2}^{+ 2}$ $24.3^{+2}_{-2}$	log Ṁ $11 . 9_{- 2}^{+ 2}$ $11.9^{+2}_{-2}$
(M_⊙ yr⁻¹)	$- 7 . 0_{- 0.2}^{+ 0.2}$ $-7.0^{+0.2}_{-0.2}$	$- 7 . 1_{- 0.2}^{+ 0.2}$ $-7.1^{+0.2}_{-0.2}$
v_∞ (km s⁻¹)	$400_{- 50}^{+ 50}$ $400^{+50}_{-50}$	$900_{- 100}^{+ 100}$ $900^{+100}_{-100}$
β	0.8	0.8 (fixed)
D	10	10 (fixed)
v sin i (km s⁻¹)	$85_{- 10}^{+ 10}$ $85^{+10}_{-10}$	$250_{- 80}^{+ 80}$ $250^{+80}_{-80}$
v_mac (km s⁻¹)	$30_{- 10}^{+ 10}$ $30^{+10}_{-10}$	50 (fixed)
v/v_crit	≳0.4	≳0.4
ξ (km s⁻¹)	15	15 (fixed)
X_H (mass fr.)	$0 . 7_{- 0.1}^{+ 0.04}$ $0.7^{+0.04}_{-0.1}$	0.737 (fixed)
X_He (mass fr.)	$0 . 29_{- 0.1}^{+ 0.1}$ $0.29^{+0.1}_{-0.1}$	0.26 (fixed)
X_C/10⁻⁵ (mass fr.)	$10_{- 2}^{+ 2}$ $10^{+2}_{-2}$	$3_{- 1}^{+ 1}$ $3^{+1}_{-1}$
X_N/10⁻⁵ (mass fr.)	$100_{- 10}^{+ 10}$ $100^{+10}_{-10}$	$20_{- 7}^{+ 7}$ $20^{+7}_{-7}$
X_O/10⁻⁵ (mass fr.)	$64_{- 10}^{+ 10}$ $64^{+10}_{-10}$	$164_{- 50}^{+ 100}$ $164^{+100}_{-50}$
E_B − V (mag)	$0 . 14_{- 0.02}^{+ 0.02}$ $0.14^{+0.02}_{-0.02}$
M_spec (M_⊙)	$7 . 8_{- 3}^{+ 3.6}$ $7.8^{+3.6}_{-3}$	$35 . 7_{- 14}^{+ 18}$ $35.7^{+18}_{-14}$
log Q_H (s⁻¹)	47.2	48.4
log Q_He II (s⁻¹)	–	42
P_orb (days)	9.398
R_RL (R_⊙)	$17 . 0_{- 7}^{+ 9}$ $17.0^{+9}_{-7}$	$33 . 8_{- 15}^{+ 19}$ $33.8^{+19}_{-15}$
f_RL	$1 . 29_{- 0.56}^{+ 0.71}$ $1.29^{+0.71}_{-0.56}$	$0 . 35_{- 0.15}^{+ 0.2}$ $0.35^{+0.2}_{-0.15}$

Notes. ^( † )log(g_* + (v sin i)²/R_*).

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