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Early chemical enrichment of the Milky Way dwarf satellites from high-resolution and NLTE analysis of VMP starsстатья
- Авторы: Mashonkina Lyudmila, Jablonka Pascale, Sitnova Tatyana, Pakhomov Yuri, North Pierre, Tatarnikov Andrey, Burlak Marina, Vozyakova Olga
- Сборник: Dwarf Galaxies: From the Deep Universe to the Present
- Серия: Proceedings of IAU Symposium
- Том: 344
- Год издания: 2019
- Издательство: Cambridge University Press
- Местоположение издательства: United Kingdom
- Первая страница: 103
- Последняя страница: 104
- DOI: 10.1017/S1743921318005318
- Аннотация: We present the NLTE abundances of 10 chemical species in 65 very metal-poor stars in eight dSphs and the Milky Way halo. The classical dSphs Sculptor, Ursa Minor, Sextans, and Fornax reveal a similar plateau at [α/Fe] = 0.3 for each of Mg, Ca, and Ti, similarly to the MW halo. We provide the evidence for a decline in α/Fe in the Boötes I UFD, that is probably due to the ejecta of SNeIa. The dichotomy in the [Sr/Ba] versus [Ba/H] diagram is observed in the classical dSphs, similarly to the MW halo, calling for two different nucleosynthesis channels for Sr. The Boötes I and UMa II UFDs reveal very similar ratios of [Sr/Mg] = -1.3 and [Ba/Mg] = -1. The stars in the Coma Berenices and Leo IV UFDs are even poorer in Sr and Ba. The subsolar Sr/Ba ratios of Boötes I and UMa II indicate a common r-process origin of their n-capture elements.
- Добавил в систему: Татарников Андрей Михайлович