Table 2.
Number and frequency of possible isolated stars relative to nearby clusters or OB associations.
| Sample | Method 1 | Method 2 | |||||
|---|---|---|---|---|---|---|---|
| dthresh, 1 = 74 pc | Number | Frequency | Number | Frequency | |||
| Only clusters | |||||||
| d.o.f. = 4 | 70 | 0.299 | 72 | 0.308 | |||
| d.o.f. = 3 | 86 | 0.368 | 90 | 0.385 | |||
| d.o.f. = 2 | 19 | 0.081 | 20 | 0.085 | |||
| Whole sample | 175 | 0.748 | 182 | 0.778 | |||
| Only OB associations | |||||||
| d.o.f. = 4 | 81 | 0.346 | 87 | 0.372 | |||
| d.o.f. = 3 | 92 | 0.393 | 94 | 0.402 | |||
| d.o.f. = 2 | 15 | 0.064 | 16 | 0.068 | |||
| Whole sample | 188 | 0.803 | 197 | 0.842 | |||
| Clusters + OB associations | |||||||
| d.o.f. = 4 | 66 | 0.282 | 69 | 0.295 | |||
| d.o.f. = 3 | 80 | 0.342 | 85 | 0.363 | |||
| d.o.f. = 2 | 13 | 0.056 | 15 | 0.064 | |||
| Whole sample | 159 | 0.679 | 169 | 0.722 | |||
| dthresh, 2 = 204pc | Number | Frequency | Number | Frequency | |||
| Only clusters | |||||||
| d.o.f. = 4 | 35 | 0.149 | 40 | 0.171 | |||
| d.o.f. = 3 | 57 | 0.244 | 68 | 0.291 | |||
| d.o.f. = 2 | 9 | 0.038 | 11 | 0.047 | |||
| Whole sample | 101 | 0.432 | 119 | 0.509 | |||
| Only OB associations | |||||||
| d.o.f. = 4 | 64 | 0.274 | 71 | 0.303 | |||
| d.o.f. = 3 | 84 | 0.359 | 91 | 0.389 | |||
| d.o.f. = 2 | 11 | 0.047 | 13 | 0.056 | |||
| Whole sample | 159 | 0.679 | 175 | 0.748 | |||
| Clusters + OB associations | |||||||
| d.o.f. = 4 | 26 | 0.111 | 33 | 0.141 | |||
| d.o.f. = 3 | 49 | 0.209 | 62 | 0.265 | |||
| d.o.f. = 2 | 4 | 0.017 | 8 | 0.034 | |||
| Whole sample | 79 | 0.338 | 103 | 0.440 | |||
Notes. Number and frequency of possible isolated stars relative to nearby star clusters or OB associations, given the threshold distance of dthresh, 1 = 74 pc and dthresh, 2 = 204 pc. Method 1 only takes the de-projected positions of stars, clusters and OB associations into account, while method 2 considers stellar groups whose age difference to the stars is 5 Myr at most. The frequencies are normalized to the total sample of stars.
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