VLT/FLAMES high-resolution chemical abundances in Sculptor: A textbook dwarf spheroidal galaxy
dc.bibliographicCitation.firstPage | A15 | eng |
dc.bibliographicCitation.volume | 626 | eng |
dc.contributor.author | Hill, Vanessa | |
dc.contributor.author | Skúladóttir, Ása | |
dc.contributor.author | Tolstoy, Eline | |
dc.contributor.author | Venn, Kim A. | |
dc.contributor.author | Shetrone, Matthew D. | |
dc.contributor.author | Jablonka, Pascale | |
dc.contributor.author | Primas, Francesca | |
dc.contributor.author | Battaglia, Giuseppina | |
dc.contributor.author | de Boer, Thomas J. L. | |
dc.contributor.author | François, Patrick | |
dc.contributor.author | Helmi, Amina | |
dc.contributor.author | Kaufer, Andreas | |
dc.contributor.author | Letarte, Bruno | |
dc.contributor.author | Starkenburg, Else | |
dc.contributor.author | Spite, Monique | |
dc.date.accessioned | 2022-02-24T08:12:09Z | |
dc.date.available | 2022-02-24T08:12:09Z | |
dc.date.issued | 2019 | |
dc.description.abstract | We present detailed chemical abundances for 99 red-giant branch stars in the centre of the Sculptor dwarf spheroidal galaxy, which have been obtained from high-resolution VLT/FLAMES spectroscopy. The abundances of Li, Na, -elements (O, Mg, Si, Ca Ti), iron-peak elements (Sc, Cr, Fe, Co, Ni, Zn), and r- and s-process elements (Ba, La, Nd, Eu) were all derived using stellar atmosphere models and semi-automated analysis techniques. The iron abundances populate the whole metallicity distribution of the galaxy with the exception of the very low metallicity tail, 2:3 [Fe/H] 0:9. There is a marked decrease in [ /Fe] over our sample, from the Galactic halo plateau value at low [Fe/H] and then, after a “knee”, a decrease to sub-solar [ /Fe] at high [Fe/H]. This is consistent with products of core-collapse supernovae dominating at early times, followed by the onset of supernovae type Ia as early as 12 Gyr ago. The s-process products from low-mass AGB stars also participate in the chemical evolution of Sculptor on a timescale comparable to that of supernovae type Ia. However, the r-process is consistent with having no time delay relative to core-collapse supernovae, at least at the later stages of the chemical evolution in Sculptor. Using the simple and well-behaved chemical evolution of Sculptor, we further derive empirical constraints on the relative importance of massive stars and supernovae type Ia to the nucleosynthesis of individual iron-peak and -elements. The most important contribution of supernovae type Ia is to the iron-peak elements: Fe, Cr, and Mn. There is, however, also a modest but non-negligible contribution to both the heavier -elements: S, Ca and Ti, and some of the iron-peak elements: Sc and Co. We see only a very small or no contribution to O, Mg, Ni, and Zn from supernovae type Ia in Sculptor. The observed chemical abundances in Sculptor show no evidence of a significantly di erent initial mass function, compared to that of the Milky Way. With the exception of neutron-capture elements at low [Fe/H], the scatter around mean trends in Sculptor for [Fe=H] 2:3 is extremely low, and compatible with observational errors. Combined with the small scatter in the age-elemental abundances relation, this calls for an effcient mixing of metals in the gas in the centre of Sculptor since 12 Gyr ago. | eng |
dc.description.version | publishedVersion | eng |
dc.identifier.uri | https://oa.tib.eu/renate/handle/123456789/8080 | |
dc.identifier.uri | https://doi.org/10.34657/7121 | |
dc.language.iso | eng | eng |
dc.publisher | Les Ulis : EDP Sciences | eng |
dc.relation.doi | https://doi.org/10.1051/0004-6361/201833950 | |
dc.relation.ispartofseries | Astronomy and Astrophysics 626 (2019) | eng |
dc.relation.issn | 0004-6361 | |
dc.relation.issn | 1432-0746 | |
dc.rights.license | CC BY 4.0 Unported | eng |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | eng |
dc.subject | Galaxies; abundances | eng |
dc.subject | Galaxies: dwarf | eng |
dc.subject | Galaxies: evolution | eng |
dc.subject | Galaxies: individual: Sculptor | eng |
dc.subject | Local Group | eng |
dc.subject | Stars: abundances | eng |
dc.subject | VLT/FLAMES spectroscopy | eng |
dc.subject.ddc | 520 | eng |
dc.title | VLT/FLAMES high-resolution chemical abundances in Sculptor: A textbook dwarf spheroidal galaxy | eng |
dc.type | article | eng |
dc.type | Text | eng |
dcterms.bibliographicCitation.journalTitle | Astronomy and Astrophysics | eng |
tib.accessRights | openAccess | eng |
wgl.subject | Physik | eng |
wgl.type | Zeitschriftenartikel | eng |
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