Table 4
Observed and predicted numbers of nitrogen rich targets with enhancements of greater than 0.3 dex (ϵN ≥ 7.2 dex) and 0.6 dex (ϵN ≥ 7.5 dex).
| Sample | N | f(ve) | ϵN ≥ 7.2 | ϵN ≥ 7.5 | ||
| ve sini (km s−1) | 0–40 | 40–80 | 0–40 | 40–80 | ||
| VFTS sample | ||||||
| Observed | 255 | – | 7 | 3 | 5 | 1 |
| MC | 255 | VFTS | 2.30 ± 1.50 | 7.17 ± 2.63 | 1.45 ± 1.18 | 4.46 ± 2.08 |
| MC Prob (%) | 255 | VFTS | 0.8 | 7 | 2 | 6 |
| MC | 220/188 | VFTS | 1.98 ± 1.14 | 5.29 ± 2.27 | 1.25 ± 1.11 | 3.32 ± 1.80 |
| MC Prob (%) | 220/188 | VFTS | 0.4 | 22 | 0.9 | 16 |
| FLAMES-I sample | ||||||
| Observed | 103 | – | 6 | 2 | 4 | 1 |
| MC | 103 | VFTS | 0.92 ± 0.96 | 2.89 ± 1.69 | 0.58 ± 0.76 | 1.82 ± 1.33 |
| MC Prob(%) | 103 | VFTS | 0.03 | 45 | 0.3 | 46 |
| MC | 73 | FLAMES-I | 0.57 ± 0.76 | 1.82 ± 1.33 | 0.26 ± 0.51 | 0.79 ± 0.89 |
| MC Prob(%) | 73 | FLAMES-I | 0.01 | 55 | 0.04 | 56 |
Notes The Monte-Carlo simulations are designated as “MC”. When two number of targets, N, are listed, they refer to simulations tailored to the different nitrogen abundance limits as discussed in the text. The rotational velocity distribution, f(ve), is either from Dufton et al. (2013, VFTS) or from the deconvolution illustrated in Fig. 6 (FLAMES-I). Simulations are provided for two ranges of projected rotational velocity, ve sin i, viz. 0–40 km s−1 and 40–80 km s−1.
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