Evidence of a non-conservative mass transfer in the ultra-compact X-ray source XB 1916-053

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Table 8.

Parameters of XB 1916-053.

Parameter
Mass ratio q	0.048
Orbital period P (s)	3000.66
Orb. period derivative Ṗ (s s⁻¹)	(1.46 ± 0.03) × 10⁻¹¹
Orbital separation a^(a) (cm)	3.54 × 10¹⁰
Roche lobe radius of the CS, R_L₂	0.156a
Roche lobe radius of the NS, R_L₁	0.594a
Outer radius of the accretion disc, r	0.47a
Distance of the CM from the NS	0.046a
Distance of L₁ from the NS, b₁	0.772a
Inclination angle i	60° < i < 80°
Bloating thermal factor b_f of the CS ^(a)	1.92
Observed luminosity ^(a) (10³⁷ erg s⁻¹)	0.41–1.46
β^(b)	0.03–0.11
Boundaries of the ejection region ^(c)	0.065a-0.101a

Notes.

^(a)

Assuming a NS mass of 1.4 M_⊙.

^(b)

Fraction of the mass transferred from the CS that accretes onto the NS.

^(c)

The boundaries are measured from the inner Lagrangian point L₁.

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