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We present a large homogeneous set of stellar parameters and abundancesacross a broad range of metallicities, involving $13$ classical dwarfspheroidal (dSph) and ultra-faint dSph (UFD) galaxies. In total this studyincludes $380$ stars in Fornax, Sagittarius, Sculptor, Sextans, Carina, UrsaMinor, Draco, Reticulum II, Bootes I, Ursa Major II, Leo I, Segue I, andTriangulum II. This sample represents the largest, homogeneous, high-resolutionstudy of dSph galaxies to date. With our homogeneously derived catalog, we areable to search for similar and deviating trends across different galaxies. Weinvestigate the mass dependence of the individual systems on the production of$\alpha$-elements, but also try to shed light on the long-standing puzzle ofthe dominant production site of r-process elements. We use data from the Keckobservatory archive and the ESO reduced archive to reanalyze stars from these$13$ dSph galaxies. We automatize the step of obtaining stellar parameters, butrun a full spectrum synthesis to derive all abundances except for iron. Thehomogenized set of abundances yielded the unique possibility to derive arelation between the onset of type Ia supernovae and the stellar mass of thegalaxy. Furthermore, we derived a formula to estimate the evolution of$\alpha$-elements. Placing all abundances consistently on the same scale iscrucial to answer questions about the chemical history of galaxies. Byhomogeneously analysing Ba and Eu in the 13 systems, we have traced the onsetof the s-process and found it to increase with metallicity as a function of thegalaxy's stellar mass. Moreover, the r-process material correlates with the$\alpha$-elements indicating some co-production of these, which in turn wouldpoint towards rare core-collapse supernovae rather than binary neutron starmergers as host for the r-process at low [Fe/H] in the investigated dSphsystems.

Neutron-capture elements in dwarf galaxies III: A homogenized analysis of 13 dwarf spheroidal and ultra-faint galaxies