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We perform a detailed study of the stellar populations in a sample of massiveFornax dwarf galaxies using a set of newly defined line indices. Using datafrom the Integral field spectroscopic data, we study abundance ratios of eightdEs with stellar mass ranging from 10$^8$ to 10$^{9.5}$ M$_\odot$ in the Fornaxcluster. We present the definitions of a new set of high-resolution Lick-styleindices to be used for stellar population studies of unresolved small stellarsystems. We identify 23 absorption features and continuum regions, mainlydominated by 12 elements (Na, Ca, Sc, Ti, V, Cr, Mn, Fe, Ni, Y, Ba and Nd) inthe wavelength range 4700 - 5400 \r{A} and characterise them as a function ofage, metallicity and alpha element abundance ratios. We analyse eight dEs andinterpret the line strengths, measured in our new high resolution system ofindices, with the aid of stellar population models with high enough spectralresolution. We obtain abundance ratio proxies for a number of elements thathave never been studied before for dwarf ellipticals outside the Local Group.These proxies represent relative deviations from predicted index-strengths ofbase stellar population models built-up following the abundance pattern of TheGalaxy. The abundance proxy trend results are compared to abundance ratios fromresolved stars in the Local Group, and indices from integrated light of largerearly-type galaxies. We find that all our dwarfs show a pattern of abundanceratios consistent with the disk of the Milky Way, indicative of slow formationin comparison to their high mass counterparts.

Non-solar abundance ratios trends of dEs in Fornax Cluster using newly defined high resolution indices