S22B0093
S22B0093
The role of electron capture supernovae (ECSNe) in the chemical evolution is yet unclear despite the observation of its candidate event and despite its importance in stellar evolution. The light neutron-capture elements are the key since theoretical calculation predicts ECSNe mainly produce these elements. Dwarf galaxies offer ideal test beds since they contain low-metallicity stars that differ in light neutron-capture element abundance compared to stars in the Milky Way at the same metallicity. However, detailed investigation has been hampered because of large heliocentric distances of dwarf galaxies. This situation has been revolutionized by the Gaia mission; it enables us to identify past members of disrupt dwarf galaxies among nearby stars, for which we can obtain high signal-to-noise ratio, high-resolution spectra. One of the disrupted dwarf galaxies, the Helmi streams, is shown to be depleted in light neutron-capture elements and hence a perfect alternative to the surviving dwarf galaxies. We focus on this disrupted galaxy and measure the detailed abundance patterns over elements that can be produced by ECSNe. Our proposed observations open a new window to study nucleosynthesis processes using disrupted dwarf galaxies that have deposited stars into the solar neighbourhood.
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