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Interstellar medium surrounding the WO star in the galaxy IC 1613: New optical and radio observations

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Abstract

Observations of the nebula S3 associated with the WO star in the galaxy IC 1613 and of an extended region surrounding S3 are reported. The star and bright core of the nebula were observed with a multipupil fiber spectrograph mounted on the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences. Images in the principle spectral lines and integrated spectra of the star and three compact clumps were obtained, and the radial-velocity field constructed. An extended region of the galaxy was observed with the Very Large Array at 21 cm. A giant ring or H I shell enclosing a large fraction of the stellar population in IC 1613 was discovered. The WO star and associated bipolar nebula, which we discovered earlier, lie at the inner edge of the H I ring. A local H I deficiency and two arclike H I ridges were also detected for the first time and probably represent the neutral component of the bipolar shell surrounding the WO star. The two arclike ridges may also have been produced by the collective stellar wind (and supernova explosions?) in OB association No. 9 from the list of Hodge. A scenario for the formation of the extended bipolar feature is discussed, based on the new data.

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Authors and Affiliations

  1. Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119899, Russia

    T. A. Lozinskaya

  2. Special Astrophysical Observatory, Nizhnii Arkhyz, Zelenchukskii raion, Karachaevo-Cherkessia, 357147, Russia

    A. V. Moiseev & V. L. Afanas’ev

  3. Department of Astronomy, University of Wisconsin-Madison, 475 N. Charter St., Madison, WI, 53706, USA

    E. Wilcots

  4. National Radio Astronomy Observatory, P.O. Box O, 1003 Lopezville Road, Socorro, NM, 87801, USA

    W. M. Goss

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  1. T. A. Lozinskaya
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  3. V. L. Afanas’ev
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__________

Translated from Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 78, No. 6, 2001, pp. 485–497.

Original Russian Text Copyright © 2001 by Lozinskaya, Moiseev, Afanas’ev, Wilcots, Goss.

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Lozinskaya, T.A., Moiseev, A.V., Afanas’ev, V.L. et al. Interstellar medium surrounding the WO star in the galaxy IC 1613: New optical and radio observations. Astron. Rep. 45, 417–427 (2001). https://doi.org/10.1134/1.1374637

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  • DOI: https://doi.org/10.1134/1.1374637

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