Table · dataset · 2025
Chemical abundances of 37 Sagittarius stars
Listed in IVOA Registry (Virtual Observatory)
We present the chemical composition of a sample of 37 red giant branch (RGB) stars belonging to the main body of the remnant of the Sagittarius (Sgr) dwarf spheroidal galaxy.
Description
All stars were observed with the FLAMES-UVES high-resolution spectrograph. Twenty-three new targets were selected along the blue side of the RGB of Sgr, but outside the galaxy stellar nucleus, in order to avoid contamination by the stars of the metal-poor globular cluster M54.
Additionally, we re-analysed archival spectra of 14 targets located on the red RGB. For this sample, we derive the abundances of 21 chemical species (from oxygen to europium) representing different nucleosynthetic sites. The sample covers a large range of metallicities, from [Fe/H]~-2 to ~-0.4dex, and we can identify the transition between the enrichment phases dominated by core-collapse and Type Ia supernovae.
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The observed [alpha/Fe] trend suggests a knee occurring at [Fe/H]~-1.5-1.3dex, compatible with the rather low star formation efficiency of Sgr. At lower [Fe/H], Sgr stars exhibit a chemical composition compatible with Milky Way stars of similar [Fe/H]. The only relevant exceptions are [Mn/Fe], [Zn/Fe], and [Eu/Fe].
Instead, at [Fe/H] higher than -1.5/-1.3dex, the chemical pattern of Sgr significantly deviates from that of the Milky Way for almost all the elements analysed in this study. Some of the abundance patterns reveal a lower contribution by very massive stars exploding as hypernovae (e.g. [Mn/Fe], [Zn/Fe]), a higher contribution by sub-Chandrasekhar progenitors of Type Ia supernovae (e.g. [Ni/Fe]), and a high production efficiency of rapid neutron-capture elements ([Eu/Fe]).
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/699/A356 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025A&A...699A.356L ui.adsabs.harvard.edu/abs/2025A%26A...699A.356L ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/a%2Ba/699/a356 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/699/a356 | 13 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:optical | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |