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Table 5.
Comparison of system parameters from single and binary evolution models that best match the derived parameters from spectroscopic analysis of M33 X-7.
| Parameter | Single star model | Binary model 1 | Binary model 2 | Empirically derived |
|---|---|---|---|---|
| T* [kK] |
 |
31.4 | 30.9 |
 |
| log g* [cm s−2] |
 |
3.44 | 3.34 |
 |
| log L [L⊙] |
 |
5.54 | 5.54 |
 |
| R* [R⊙] |
 |
20 | 20.6 |
 |
| log Ṁwind [M⊙yr−1] |
 |
−6.35 | −6.1 |
 |
| vrot [km s−1] |
 |
30 | 278 |
 |
| XHe [mass fr.] |
 |
0.28 | 0.3 |
 |
| log[C/H]+12 | 7.58 | 7.64 | 7.56 | 7.05 |
| log[N/H]+12 | 7.84 | 7.63 | 7.67 | 7.85 |
| log[O/H]+12 | 8.27 | 8.3 | 8.32 | 8.45 |
| P [days] | 4.1 | 6.3 | 3.45 | |
| MO [M⊙] |
 |
39.4 | 34.2 |
 |
| MBH [M⊙] | ≲10.5 | ≲12.2 |
 |
|
| dBH [R*] | 2 | 2.5 |
 |
|
| Rrl [R*] | 1 | 1.1 |
 |
|
| Age [Myr] |
 |
5.76 | 5.08 |
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