Table 1
Parameters derived for H I shells.
| Shell | Long. (deg) | Lat. (deg) | V0 (km s−1) | ΔV (km s−1) | Radius (pc) | Distance (kpc) | Age (Myr) | Gaseous mass (M⊙) | Kinetic energy (erg) |
|---|---|---|---|---|---|---|---|---|---|
| GS 108–0.4–057 (Shell 1) | 108.0 | −0.37 | −57.0 | 12.3 | 29.6 | 2.7 | 4.8 | 6.6 × 103 | 2.5 × 1048 |
| GS 109–02–056 (Shell 2) | 109.2 | −1.8 | −55.5 | 14.8 | 37.7 | 2.7 | 4.9 | 1.5 × 104 | 8.4 × 1048 |
| GS 110–0.3–54 (Shell 3) | 109.6 | −0.3 | −54.2 | 17.3 | 25.0 | 2.7 | 2.9 | 1.1 × 104 | 8.5 × 1048 |
| GS 111+0.0–060 (Shell 4) | 111.3 | 0.0 | −59.6 | 17.3 | 22.0 | 2.7 | 2.5 | 3.4 × 103 | 2.5 × 1048 |
Notes. Uncertainty in V0 is determined by velocity resolution of data, which is ±1.3 km s−1. The error in ΔV is 2.6 km s−1, while the uncertainty in the radius is 16%. The distance error is about 20%, and the age uncertainty is around 24%. Estimated masses carry an error of about 50%, and the error in kinetic energy is about 60%.
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