Table 8
Comparison of stellar parameters with bubble energetics of the three regions.
| Region | Star | Stellar type | Teff [K ] | L⋆ [L⊙ ] | Lw [erg s−1 ] | Mshell [M⊙] | vexp [km s−1] | Ekin [erg] | t0 [Myr] | Ekin∕(Lwt0) |
|---|---|---|---|---|---|---|---|---|---|---|
| M 42 | θ1 Ori C | O7V | 3.9 × 104 | 2.0 × 105 | 8 × 1035 | 1500 | 13 | 2.5 × 1048 | 0.2 | 0.5 |
| M 43 | NU Ori | B0.5V | 3.1 × 104 | 2.6 × 104 | ~3 × 1031 | 7 | 6 | 3 × 1045 | 0.02 | 50 |
| NGC 1977 | 42 Ori | B1V | 2.5 × 104 | 1.1 × 104 | ~3 × 1031 | 700 | 1.5 | 2 × 1046 | 0.4 | 40 |
Notes. In the last column, we take for t0 the value derived from the stellar wind models; in case of M 43 the lifetime derived from pressure-driven expansion is a third of that value, increasing the ratio Ekin ∕(Lwt0) by a factor of three. Stellar parameters of θ1 Ori C are from Simón-Díaz et al. (2006), of NU Ori from Simón-Díaz et al. (2011), and of 42 Orionis from Hohle et al. (2010).
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