%0 Generic %1 skuladottir2017sculptor %A Skúladóttir, Ása %A Tolstoy, Eline %A Salvadori, Stefania %A Hill, Vanessa %A Pettini, Max %D 2017 %K Zinc dwarf spherodial %T Zinc in the Sculptor dwarf spheroidal galaxy %U http://arxiv.org/abs/1708.00511 %X From ESO VLT/FLAMES/GIRAFFE spectra, abundance measurements of Zn have been made in $\approx$100 individual red giant branch (RGB) stars in the Sculptor dwarf spheroidal galaxy. This is the largest sample of individual Zn abundance measurements within a stellar system beyond the Milky Way. In the observed metallicity range, $-2.7łeqFe/Hłeq-0.9$, the general trend of Zn abundances in Sculptor is similar to that of $\alpha$-elements. That is, super-solar abundance ratios of Zn/Fe at low metallicities, which decrease with increasing Fe/H, eventually reaching subsolar values. However, at the higher metallicities in Sculptor, $Fe/H\gtrsim-1.8$, we find a significant scatter, $-0.8łesssimZn/Fełesssim+0.4$, which is not seen in any $\alpha$-element. Our results are consistent with previous observations of a limited number of stars in Sculptor and in other dwarf galaxies. These results suggest that zinc has a complex nucleosynthetic origin, behaving neither completely like an $\alpha$- nor an iron-peak element.

@misc{skuladottir2017sculptor, abstract = {From ESO VLT/FLAMES/GIRAFFE spectra, abundance measurements of Zn have been made in $\approx$100 individual red giant branch (RGB) stars in the Sculptor dwarf spheroidal galaxy. This is the largest sample of individual Zn abundance measurements within a stellar system beyond the Milky Way. In the observed metallicity range, $-2.7\leq\text{[Fe/H]}\leq-0.9$, the general trend of Zn abundances in Sculptor is similar to that of $\alpha$-elements. That is, super-solar abundance ratios of [Zn/Fe] at low metallicities, which decrease with increasing [Fe/H], eventually reaching subsolar values. However, at the higher metallicities in Sculptor, $\text{[Fe/H]}\gtrsim-1.8$, we find a significant scatter, $-0.8\lesssim\text{[Zn/Fe]}\lesssim+0.4$, which is not seen in any $\alpha$-element. Our results are consistent with previous observations of a limited number of stars in Sculptor and in other dwarf galaxies. These results suggest that zinc has a complex nucleosynthetic origin, behaving neither completely like an $\alpha$- nor an iron-peak element.}, added-at = {2017-08-03T10:30:23.000+0200}, author = {Skúladóttir, Ása and Tolstoy, Eline and Salvadori, Stefania and Hill, Vanessa and Pettini, Max}, biburl = {https://www.bibsonomy.org/bibtex/2028add4b30b23e415fdc4355efb990da/miki}, description = {[1708.00511] Zinc in the Sculptor dwarf spheroidal galaxy}, interhash = {35be29548904294dc75104a200e1a050}, intrahash = {028add4b30b23e415fdc4355efb990da}, keywords = {Zinc dwarf spherodial}, note = {cite arxiv:1708.00511Comment: Accepted in A&A, 14 pages, 16 figures, 8 tables}, timestamp = {2017-08-03T10:30:23.000+0200}, title = {Zinc in the Sculptor dwarf spheroidal galaxy}, url = {http://arxiv.org/abs/1708.00511}, year = 2017 }