Ring nebulae associated with of stars: Statistics,classification, origin |
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| Authors: | T A Lozinskaya |
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| Institution: | (1) Sternberg Astronomical Institute, The University, Moscow, U.S.S.R. |
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| Abstract: | The ring nebulae associated with galactic Of stars is considered on the grounds of the list of Of nebulae proposed by lozinskaya and Lomovsky (1982). Taking into account the selection effects, about 80% of Of stars are shown to be associated withHii regions and about 30–50% of these regions have shell structures. Four types of nebulae associated with Of stars are resolved: amorphousHii regions, ring-likeHii regions, wind-blown bubbles, and stellar ejectas. These types appear to be identical to the morphology of nebulae around WR stars proposed by Chu (1981). Observational data are presented and the nature of a number of Of ring nebulae of different types is discussed. |
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