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.
Beschreibung
[1708.00511] Zinc in the Sculptor dwarf spheroidal galaxy
%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
}