Table · dataset · 2026
Metal-poor stars with X-Shooter
Listed in IVOA Registry (Virtual Observatory)
We present a detailed chemical analysis study of 16 candidate metal-poor stars, previously identified with 2dF+AAOmega, using X-Shooter spectra and the Korg 1D LTE spectral synthesis code.
Description
We generally confirm the earlier metallicity estimates and reveal six EMP ([Fe/H]<-3) stars in the current sample. Two of these stars, including the most metal-poor at [Fe/H]=-3.89+/-0.07, are kinematically associated with the GSE accretion event, increasing the number of known GSE stars with [Fe/H]<-3.5 to eight.
From the X-Shooter spectra we determine abundances for 16 elements, with the element-to-iron abundance ratios generally consistent with high-resolution studies of Galactic halo stars. Within the sample, we identify three peculiar stars: the first is a GSE nitrogen enhanced metal poor (NEMP; [N/Fe]=1.60+/-0.10 and [C/Fe]=0.23+/-0.08) star with unusually high Na ([Na/Fe]=2.26+/-0.07) and Li (A(Li)_3DNLTE_=1.90+/-0.08) abundances, but lacking enhancements in [Al/Fe] or [Mg/Fe].
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The second is a halo r-II star significantly enhanced in Sr ([Sr/Ba]=0.39+/-0.08), suggesting mixture of r-process and s-process enrichment, uncommon for r-II stars. Whilst the third is a halo star very depleted in N ([N/Fe]<-1.13), with low C ([C/Fe]=-0.33+/-0.08) and otherwise 'normal' [X/Fe] abundances, suggesting enrichment with Type II supernova that proceeds enrichment from massive AGB stars. This study reveals the substantial degree of chemical diversity in the stellar populations which assembled the early Milky Way.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/546/G170 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2026MNRAS.546ag170L ui.adsabs.harvard.edu/abs/2026MNRAS.546ag170L ↗
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/mnras/546/g170 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 70%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/mnras/546/g170 | 11 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].anzsrc:group:5101 | enrichment · IVOA Registry | taxonomy-embedding@1.1.0 | title+keywords+description (70%) |
| 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 |