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Table 2.
Parameters of the inner binary in HR 6819 compared to those of the inner binary in LB-1 (Liu et al. 2019).
| Parameter | [unit] | HR 6819 | LB-1 |
|---|---|---|---|
| P | [d] | 40.333 ± 0.004 | 78.9 |
| K1 | [km s−1] | 61.3 ± 0.6 | 52.8 |
| e | 0.03 ± 0.01 | 0.03 | |
| Tconj | [MJD] | 53177.44 ± 0.07 | N/A |
| ω (fixed) | [°] | 89 | N/A |
| γ | [km s−1] | 9.4 ± 0.5 | 28.7 |
| Mass function fM | [M⊙] | 0.96 ± 0.03 | 1.20 |
| Minimum B star mass | [M⊙] | 5.0 | 8.2 |
| Minimum BH mass | [M⊙] | > 4.2 | > 6.3 |
Notes. The minimum BH mass for HR 6819 was derived with fM − 2σ = 0.90 instead of fM itself to obtain a true lower limit.
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