Table 4
Parameters of the “best-fit” bubble model and observed values of BD +30° 3639’s hot bubble.
| Parameter | “Best-fit” | BD +30° 3639 |
|---|---|---|
| C (erg cm−1 s−1 K−7∕2) | 3 × 10−7 | – |
| Age (yr) | 500 | – |
| Ṁsw (M⊙ yr−1) | 5 × 10−7 | – |
| vsw (km s−1) | 40 | – |
| Rin(cm) | 3.75 × 1016 | – |
| Rout(cm) | 4.89 × 1016 | 4.0 × 1016 |
| TX(MK) | 1.82 | 2.3, ≃ 1.7−2.7 |
| LX(erg s−1) | 8.23 × 1032 | (7.4−8.6) × 1032 |
| H | 0.019 | – |
| He | 0.389 | 0.43 |
| C | 0.472 | 0.51 |
| O | 0.050 | 0.06 |
| Ne | 0.046 | – |
Notes. Only the mass fractions of the major elements H, He, C, O, and Ne are listed. Their values are essentially those of the WR mixture in Table 2 but renormalised because of the enhanced neon abundance. The hydrogen abundance must be understood as an upper limit only. The abundance entries given for BD +30 refer to the stellar values of Marcolino et al. (2007, Table 2 therein). The TX and LX values for BD +30 are from Yu et al. (2009). A distance of 1300 pc has been assumed.
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