Table 1
N-body models and their initial conditions.
| Model |  (pc) |
IMS | f bin | IPD | Pairing method | e dist. |
|
|
||||||
| MS1OP | 0.1 | Y | 1 | Kroupa | OP | thermal |
| MS3OP_SPC | 0.3 | Y | 1 | Sana et al. | OP | e = 0 |
| MS3OP_SP | 0.3 | Y | 1 | Sana et al. | OP | thermal |
| MS3UQ_SP | 0.3 | Y | 1 | Sana et al. | uniform q-dist. | thermal |
| MS3OP | 0.3 | Y | 1 | Kroupa | OP | thermal |
| MS3RP | 0.3 | Y | 1 | Kroupa | RP | thermal |
| MS3S | 0.3 | Y | 0 | – | – | – |
| NMS3OP | 0.3 | N | 1 | Kroupa | OP | thermal |
| NMS3RP | 0.3 | N | 1 | Kroupa | RP | thermal |
| NMS3S | 0.3 | N | 0 | – | – | – |
| MS8OP | 0.8 | Y | 1 | Kroupa | OP | thermal |
| MS8RP | 0.8 | Y | 1 | Kroupa | RP | thermal |
| MS8S | 0.8 | Y | 0 | – | – | – |
| NMS8OP | 0.8 | N | 1 | Kroupa | OP | thermal |
| NMS8RP | 0.8 | N | 1 | Kroupa | RP | thermal |
| NMS8S | 0.8 | N | 0 | – | – | – |
Notes. Initial half-mass radius, , is listed in Col. 2. Column 3 denotes initial mass segregation (IMS), N standing for the initially unsegregated cluster model and Y for the initially mass-segregated one. The initial binary fraction, fbin, is listed in Col. 4. Initial period distributions (IPD) applied to massive binaries are listed in Col. 5, where Sana et al. and Kroupa refer to the distributions introduced in Sana et al. (2012, Eq. (3 and Kroupa (1995b, Eq. (2. Column 6 is the pairing method for massive binaries (primary mass m1 ≥ 5 M⊙, for details see Sect. 2). The last column gives the initial eccentricity distribution for massive binaries. In binary-rich clusters, all low-mass binaries have the period distribution of Kroupa (1995b) and a thermal eccentricity distribution, and their component masses are randomly paired for consistency with observational data (Kroupa 1995a,b; Marks & Kroupa 2011). Each model is computed Nrun = 100 times with different random number seeds to obtain representative statistics.
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