Description
While collisionally excited lines in HII regions allow one to easily probe the chemical composition of the interstellar medium in galaxies, the possible presence of important temperature fluctuations casts some doubt on the derived abundances. To provide new insights into this question, we have carried out a detailed study of a giant HII region, H1013, located in the galaxy M101, for which many observational data exist and which has been claimed to harbour temperature temperature fluctuations at a level of t^2^=0.03-0.06.
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