Structure and kinematics of the ISM near WR 139 |
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| Authors: | T G Sitnik |
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| Institution: | 1.Sternberg Astronomical Institute,Moscow,Russia |
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| Abstract: | The structure and kinematics of the ISM in an extended vicinity of the star WR 139 is analyzed using the results of original
Hα interferometric observations together with radio and infrared data. A CO cavity with a size of up to 40′ has been detected
around the star at velocities of V
LSR ∼ 2.5–10 km/s; the cavity is bounded to the North by a shell radiating in the optical. Ionized hydrogen emits at the systematic
velocities V
LSR ∼ 6–14 km/s toward the CO cavity, and at V
LSR ≃ 4–11 km/s toward the shell. High-velocity motions of ionized hydrogen inside the cavity testify to the probable expansion
of gas that has been swept out by the stellar wind of WR 139 at velocities of up to 60–80 km/s. |
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