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We discuss the implications of assuming different star formation histories(SFH) in the relation between star formation rate (SFR) and mass derived by thespectral energy distribution fitting (SED). Our analysis focuses on a sample ofHII galaxies, dwarf starburst galaxies spectroscopically selected through theirstrong narrow emission lines in SDSS DR13 at z<0.4, cross-matched withphotometric catalogs from GALEX, SDSS, UKIDSS and WISE. We modeled and fittedthe SEDs with the code CIGALE adopting different descriptions of SFH. By addinginformation from different independent studies we find that HII galaxies arebest described by episodic SFHs including an old (10 Gyr), an intermediate age(100-1000 Myr) and a recent population with ages < 10 Myr. HII galaxies agreewith the SFR-M relation from local star-forming galaxies, and only lie abovesuch relation when the current SFR is adopted as opposed to the average overthe entire SFH. The SFR-M demonstrated not to be a good tool to provideadditional information about the SFH of HII galaxies, as different SFH presenta similar behavior with a spread of <0.1 dex.

The effects of star formation history in the SFR-M relation of HII galaxies