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Many works have found unusual characteristics of elemental abundances innearby dwarf galaxies. This implies that there is a key factor of galacticevolution that is different from that of the Milky Way (MW). The chemicalabundances of the stars in the Fornax dwarf spheroidal galaxy (Fornax dSph)provide excellent information for setting constraints on the models of thegalactic chemical evolution. In this work, adopting the five-componentapproach, we fit the abundances of the Fornax dSph stars, including $\alpha$elements, iron group elements and neutron-capture elements. For most samplestars, the relative contributions from the various processes to the elementalabundances are not usually in the MW proportions. We find that thecontributions from massive stars to the primary $\alpha$ elements and irongroup elements increase monotonously with increasing [Fe/H]. This means thatthe effect of the galactic wind is not strong enough to halt star formation andthe contributions from massive stars to $\alpha$ elements did not halted for[Fe/H]$\lesssim$-0.5. The average contributed ratios of various processesbetween the dSph stars and the MW stars monotonously decrease with increasingprogenitor mass. This is important evidence of a bottom-heavy initial massfunction (IMF) for the Fonax dSph, compared to the MW. Considering abottom-heavy IMF for the dSph, the observed relations of [$\alpha$/Fe] versus[Fe/H], [iron group/Fe] versus [Fe/H] and [neutron-capture/Fe] versus [Fe/H]for the dSph stars can be explained.

Investigation of the Puzzling Abundance Pattern in the Stars of the Fornax Dwarf Spheroidal Galaxy