Abstract
A calibration previously determined for the evolution of the equivalent width of the emission line Hβ with age for Hii regions (Dottori, 1981) is applied to detached extragalactic Hii regions. The frequency distribution of ages seems to indicate that some of these regions had other bursts of star formation so important as the observed last one.
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Dottori, H.A. Burst of star formation in detached extragalactic Hii regions: A qualitative analysis. Astrophys Space Sci 90, 385–389 (1983). https://doi.org/10.1007/BF00650070
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DOI: https://doi.org/10.1007/BF00650070