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Nebular complex in the region of Cas OB2 association; ring nebula Sh157

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Abstract

This paper presents the results of monochromatic [Oiii], [Nii], and [Sii] observations of ring nebula Sh157 around the star (WR + B0III) HD 219460 belonging to the Ba 3 cluster. A stratification of radiation typical for photoionization excitation has been revealed. The observations suggest that the Sh157 ring structure may arise as a result of the HD 219460 stellar wind blowing the surroundingHii region, and the bubble age is found to bet≃(2–5)×105 yr. Three outer envelopes have been distinguished: a weaker extended emission shell apparently blown out by the wind from B-stars of the Ba 3 cluster, and two dust shells which are likely to be associated with NGC 7510 and Cas OB2. The paper is also concerned with the discussion of young star aggregates Ba 3, NGC 7510, Cas OB1, OB2, OB4, OB5, OB7, and Cep OBI and the associatedHii regions, shells and supershells of gas and dust, molecular clouds, and supernova remnants which may be probable members of a single giant stellar complex where the star formation process is in progress.

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  1. Sternberg State Astronomical Institute, Moscow, U.S.S.R.

    T. A. Lozinskaya, T. G. Sitnik & A. I. Lomovskii

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  1. T. A. Lozinskaya
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  2. T. G. Sitnik
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  3. A. I. Lomovskii
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Lozinskaya, T.A., Sitnik, T.G. & Lomovskii, A.I. Nebular complex in the region of Cas OB2 association; ring nebula Sh157. Astrophys Space Sci 121, 357–385 (1986). https://doi.org/10.1007/BF00653708

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