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Gas emission spectrum in the Irr galaxy IC 10 |
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| Authors: | T A Lozinskaya O V Egorov A V Moiseev D V Bizyaev |
| Institution: | 1. Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119992, Russia 2. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhni Arkhyz, 357147, Karachai-Cherkessian Republic, Russia 3. Apache Point Observatory, Sunspot, USA |
| Abstract: | Observations of the dwarf Irr galaxy IC 10 have been performed at the 6-m Special Astrophysical Observatory telescope with the SCORPIO focal reducer in the mode of a slit spectrograph. The ionized-gas emission spectrum in the region of intense current star formation has been investigated. The relative oxygen, N+, and S+ abundances in about twenty H II regions and the synchrotron superbubble have been estimated. The galaxy-averaged oxygen abundance is 12 + log(O/H) = 8.17 ± 0.35 and the metallicity is Z = 0.18 ± 0.14Z ⊙. The metallicity found by comparing diagnostic diagrams with photoionization models is shown to be less reliable than its estimate based on strong oxygen lines. |
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