Table 2.
Classification scheme based on the shape of the nebulae associated with BSC stars, the misalignment angle α, and the spatial offset between the star and the nebula.
| Classification | Shape | α | Offset | Nneb | fneb | Potential formation mechanism |
|---|---|---|---|---|---|---|
| Aligned bow shock | Sickle-like | ≤20∘ | yes | 34 | 13 ± 1% | High-velocity star |
| Unaligned bow shock | Sickle-like | ≥20∘ | yes | 60 | 24 ± 1% | Motion of ISM |
| Centered | Round/elliptical/diffuse | – | no | 52 | 20 ± 1% | RLOF in binary system |
| Unresolved | Not resolved | – | no | 72 | 28 ± 1% | – |
| Not classified | Ambiguous | – | – | 37 | 15 ± 1% | – |
Notes. Columns 5 and 6 give the absolute number Nneb and the relative frequency fneb of nebulae belonging to the respective groups. To estimate counting errors, we use the binomial error formula 
(not taking into account the misclassification errors). Here, we give the updated numbers and fractions after the reclassification based on the MIPS data. The last column indicates the potential formation mechanism (see Sect. 4.1).
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