Table 2
Dependence of orbital periods of binary Cepheids on their environment or type of companion.
| Binary type | Q50 | Q75 − Q50 | Q50 − Q25 |
|---|---|---|---|
| All ProCeps | 2.0 | 2.1 | 1.2 |
| All BiCeps | 4.8 | 2.1 | 1.4 |
| BiCeps in field | 4.5 | 2.1 | 1.2 |
| BiCeps in clusters | 5.3 | 2.0 | 1.8 |
| BiCeps in clusters of Mecl < 500 M⊙ | 5.9 | 1.4 | 1.3 |
| BiCeps in clusters of Mecl > 1000 M⊙ | 4.1 | 1.1 | 1.1 |
| BiCeps with compact companion | 4.6 | 0.9 | 0.5 |
| All outer triples including BiCeps | 8.5 | 0.8 | 1.4 |
| All BiCeps in control models | 4.2 | 1.2 | 1.1 |
Notes. Q50 indicates the median of the orbital period (in log10(P[days])). The extent and asymmetry of the log10(P) distribution is indicated by the difference between its median and its upper quartile Q75 (75th percentile) and lower quartile Q25 (25th percentile). The upper eight lines pertain to the standard models, while the last line pertains to the control models. The results correspond to the population of clusters with Rg = 8 kpc and Z = 0.014.
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