Abstract
Recently, Mateu, Bruzual, & Magris (2006) developed a non parametric algorithm called GASPEX (GAlaxy Spectrum Parameter EXtraction) to recover a galaxy star formation history (SFH) and chemical evolution from its spectral energy distribution (SED). Nevertheless, in late type galaxies the youngest population contribution to the SED could be hidden in the optical continuum, which is mainly dominated by old and evolved stars; therefore the SFH obtained from an optical SED may not include an important fraction of the recent star formation events in the galaxy. In this work we show that imposing restrictions on the calculations, based on the H α line emission as a tracer of recent star formation events, we improve the determination of the SFR in the last 100 Myr.
