Table 4.
Predicted populations derived with various different assumptions.
| Fiduciala | Kick-265 | Kick-0 | Kick-BH | logPq-flat | SFH-S | SFH-R | υcrit-0.98 | υcrit-0.8 | NS-limit | |
|---|---|---|---|---|---|---|---|---|---|---|
| WR+O | 2.75 | = | = | = | 2.62 | 1.08 | 2.78 | 4.91 | 1.68 | = |
| WR+Oe | 3.97 | = | = | = | 5.19 | 1.82 | 4.01 | 1.80 | 5.03 | = |
| He+OB | 12.1 | = | = | = | 8.63 | 10.2 | 15.1 | 15.6 | 8.71 | = |
| He+OBe | 223 | = | = | = | 200 | 221 | 347 | 220 | 226 | = |
| BH+OB | 40.3 | = | = | 29.5 | 42.1 | 30.5 | 52.3 | 64.0 | 17.1 | 0 |
| BH+OBe | 170 | = | = | 96.4 | 226 | 165 | 261 | 147 | 194 | 0 |
| NS+OB | 3.74 | 1.41 | 8.02 | = | 2.79 | = | 6.75 | 4.39 | 1.84 | 3.74+14.2 |
| NS+OBe | 21.0 | 3.24 | 95.1 | = | 21.8 | = | 46.3 | 20.4 | 23.0 | 21.0+28.1 |
| OB disr. | 2.83 | 5.38 | 0 | 2.83+7.45 | 1.73 | = | 4.74 | 3.47 | 1.36 | 2.83+24.7 |
| OBe disr. | 71.5 | 91.0 | 0 | 71.5+74.9 | 93.5 | = | 153 | 70.8 | 73.0 | 71.5+138 |
| OBe | 489 | = | = | = | 546 | 502 | 811 | 460 | 521 | = |
| − Oe | 22.6 | = | = | = | 29.5 | 17.3 | 23.0 | 16.1 | 27.4 | = |
| O stars | 1072 | = | = | = | 1080 | 444 | 1083 | = | = | = |
| − pre-int. | 979 | = | = | = | 1010 | 367 | = | = | = | = |
| − merger | 43.1 | = | = | = | 20.0 | 37.4 | 52.5 | = | = | = |
| − post-int. | 49.3 | = | = | = | 49.2 | 38.6 | 51.0 | = | = | = |
Notes. The predictions of fiducial model are listed for comparison purposes, and were computed with the Kroupa IMF (Eq. 7), the Sana distributions for initial mass ratios and orbital periods (Eq. 8 and Eq. 9), and with our fiducial kick velocity distributions (Table 1). A Be feature is assumed with υrot/υcrit > 0.95 and BH forms with He core mass above 6.6 M⊙ at the core He depletion. We varied these assumptions in different models (see Sect. 4 for the definitions). O stars are defined by effective temperatures above 31.6 kK, which are further divided into pre-interaction, merger products, and the MS companions in post-interaction binaries. In the table, ‘=’ means the same value as the fiducial model, and ‘+’ indicates the number change compared with the fiducial model, for example, in the NS-limit model, the number of NS+OB binaries is ‘3.74+14.2’, which means that the NS-limit predicts 14.2 more NS+OB binaries than the fiducial model.
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