Revealing the state transition of Cen X-3 at high spectral resolution with Chandra

Open Access

Table 1.

Properties of the Cen X-3 system.

Donor star
MK type	O6-8 III	Hutchings et al. (1979)
M_opt	$20 . 2_{- 1.5}^{+ 1.8} M_{⊙}$ $20.2^{+1.8}_{-1.5}\,M_\odot$	van der Meer et al. (2007)
R_*	12.1 ± 0.5 R_⊙	Naik et al. (2011)
E(B − V)	2.456 mag	Willingale et al. (2013)

Neutron star

M_NS	$1 . 34_{- 0.14}^{+ 0.16} M_{⊙}$ $1.34^{+0.16}_{-0.14}\,M_\odot$	van der Meer et al. (2007)
Spin period	4.79 s	This work
Magnetic field	(2.4 − 3.0)×10¹² G	Naik et al. (2011)

Orbit

Orbital period	2.087139842(18) d	Klawin et al. (2023)
Ṗ	−1.03788(27) × 10⁻⁸ days day⁻¹	Klawin et al. (2023)
i	$72_{- 5}^{° + 6}$ $72^{\circ+6}_{-5}$	Falanga et al. (2015)
Eccentricity e	0.00006–0.000266	Klawin et al. (2023)
Semimajor axis a	$1 . 58_{- 0.04}^{+ 0.05} R_{*}$ $1.58^{ +0.05}_{-0.04}\,R_\ast$	Sanjurjo-Ferrín et al. (2021)
NS distance to the barycenter	1.48 ± 0.01 R_*	Sanjurjo-Ferrín et al. (2021)
NS velocity with respect to the barycenter	436 ± 4 km s⁻¹	Sanjurjo-Ferrín et al. (2021)
Distance	$6 . 8_{- 0.5}^{+ 0.6}$ $6.8^{+0.6}_{-0.5}$ kpc	Bailer-Jones et al. (2021)
T₀ (MJD)	50506.788423(7)	Falanga et al. (2015)

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