Abstract
We utilize a sample of 45 local star-forming galaxies (z < 0.18) from the COS Legacy Archive Spectroscopic SurveY (CLASSY) to analyze the N/O versus O/H relationship. Nitrogen and oxygen are ejected into the interstellar medium at different timescales by intermediate-mass and massive stars. Therefore, the N/O abundance ratio with respect to the gas-phase metallicity (O/H) is a powerful tool to improve our interpretation on galaxy formation and evolution. In order to analyze such a relation, we derive the the electron density and temperature for the whole sample, allowing for accurate determinations of N/O and the metallicity. We compare our results with an additional sample of dwarf star-forming galaxies and extragalactic H ii regions. We also analyze the N/O ratio with the stellar mass and star formation rate.
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