A giant bipolar shell around the WO star in the galaxy IC 1613: Structure and kinematics |
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| Authors: | V L Afanas’ev T A Lozinskaya A V Moiseev E Blanton |
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| Institution: | (1) Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Stavropolskii krai, 357147, Russia;(2) Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119899, Russia;(3) Columbia University, New York, USA |
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| Abstract: | Observations of the nebula associated with the WO star in the galaxy IC 1613 are presented. The observations were carried out with a scanning Fabry-Perot interferometer in Hα using the 6-m Special Astrophysical Observatory telescope; narrow-band Hα and O III]images were obtained with the 4-m KPNO telescope (USA). The monochromatic Hα image clearly reveals a giant bipolar shell structure outside the bright nebula S3. The sizes of the southeastern and northwestern shells are 112×77 and (186–192)×(214–224) pc, respectively. We have studied the object’s kinematics for the first time and found evidence for expansion of both shells. The expansion velocities of the southeastern and northwestern shells exceed 50 and 70 km s?1, respectively. We revealed a filamentary structure of the shells and several compact features in the S3 core. A scenario is proposed for the formation of the giant bipolar structure by the stellar wind from the central WO star located at the boundary of a “supercavity” in the galaxy’s H I distribution. |
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| Keywords: | interstellar medium stellar wind WR stars |
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