On the relation between electron temperatures in the O+ and O++ zones in high-metallicity H ii regions期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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On the relation between electron temperatures in the O⁺ and O⁺⁺ zones in high-metallicity H ii regions

Authors:	Leonid S Pilyugin José M Vílchez Trinh X Thuan

Institution:	Main Astronomical Observatory of National Academy of Sciences of Ukraine, 27 Zabolotnogo Str., 03680 Kiev, Ukraine;Instituto de Astrofísica de Andalucía, CSIC, Apdo, 3004, 18080 Granada, Spain;Astronomy Department, University of Virginia, PO Box 3818, University Station, Charlottesville, VA 22903, USA

Abstract:	We suggest a new way to establish the relation between the electron temperature t ₃ within the O iii ] zone and the electron temperature t ₂ within the O ii ] zone in high-metallicity (12 + log(O/H) > 8.25) H ii regions. The t ₂– t ₃ diagram is constructed by applying our method to a sample of 372 H ii regions. We find that the correlation between t ₂ and t ₃ is tight and can be approximated by a linear expression. The new t ₂– t ₃ relation can be used to determine t ₂ and accurate abundances in high-metallicity H ii regions with a measured t ₃. It can also be used in conjunction with the ff relation for the determination of t ₃ and t ₂ and oxygen abundances in high-metallicity H ii regions, where the O iii ]λ4363 auroral line is not detected. The derived t ₂– t ₃ relation is independent of photoionization models of H ii regions.

Keywords:	ISM: abundances H ii regions galaxies: abundances