Orbital period decay of compact black hole X-ray binaries: the influence of circumbinary disks?

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Table 3

Calculated result of BHXBs with a donor star of 1.5 M_⊙ under different input parameters δ.

Item	δ	M _bh	M _d	P _orb	Ṗ _orb
		(M_⊙)	(M_⊙)	(d)	(ms yr^-1)

1^a	0.0001	7.26	0.25	12.17	0.03
2^a	0.00015	7.31	0.21	2.19	0.00
3	0.00017	7.34	0.18	0.59	–0.01
4	0.00018	7.33	0.18	0.17	–2.19
5^b	0.0002	–	–	–	–

Notes.

^(a)

When the binary system has already evolved into a detached system, the donor star mass is still greater than 0.18 M_⊙.

^(b)

The mass transfer is dynamically unstable.

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