SIMBAD references

We suggest a new way to establish the relation between the electron temperature t₃ within the [Oiii] zone and the electron temperature t₂ within the [Oii] zone in high-metallicity (12 + log(O/H) > 8.25) Hii regions. The t₂-t₃ diagram is constructed by applying our method to a sample of 372 Hii regions. We find that the correlation between t₂ and t₃ is tight and can be approximated by a linear expression. The new t₂-t₃ relation can be used to determine t₂ and accurate abundances in high-metallicity Hii regions with a measured t₃. It can also be used in conjunction with the ff relation for the determination of t₃ and t₂ and oxygen abundances in high-metallicity Hii regions, where the [Oiii]λ4363 auroral line is not detected. The derived t₂-t₃ relation is independent of photoionization models of Hii regions.