Table · dataset · 2023
Extremely metal-poor stars in SkyMapper DR1.1
Listed in IVOA Registry (Virtual Observatory)
We present and discuss the results of a search for extremely metal-poor stars based on photometry from data release DR1.1 of the SkyMapper imaging survey of the southern sky.
Description
In particular, we outline our photometric selection procedures and describe the low-resolution (R~3000) spectroscopic follow-up observations that are used to provide estimates of effective temperature, surface gravity, and metallicity ([Fe/H]) for the candidates.
The selection process is very efficient: of the 2618 candidates with low-resolution spectra that have photometric metallicity estimates less than or equal to -2.0, 41 per cent have [Fe/H]=<-2.75 and only approximately seven per cent have [Fe/H]>-2.0dex. The most metal-poor candidate in the sample has [Fe/H]<-4.75 and is notably carbon rich. Except at the lowest metallicities ([Fe/H]<-4), the stars observed spectroscopically are dominated by a 'carbon-normal' population with [C/Fe]_1D,LTE_=<+1dex.
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Consideration of the A(C)_1D,LTE_ versus [Fe/H]_1D,LTE_ diagram suggests that the current selection process is strongly biased against stars with A(C)_1D,LTE_>7.3 (predominantly CEMP-s) while any bias against stars with A(C)_1D,LTE_<7.3 and [C/Fe]_1D,LTE_>+1 (predominantly CEMP-no) is not readily quantifiable given the uncertainty in the SkyMapper v-band DR1.1 photometry. We find that the metallicity distribution function of the observed sample has a power-law slope of {Delta}(LogN)/{Delta}[Fe/H]=1.5+/-0.1dex per dex for -4.0=<[Fe/H]=<-2.75, but appears to drop abruptly at [Fe/H]~-4.2, in line with previous studies.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/489/5900 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2019MNRAS.489.5900D ui.adsabs.harvard.edu/abs/2019MNRAS.489.5900D ↗
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/489/5900 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 72% · Imaging 75%
Provenance · 1 source records, 11 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/mnras/489/5900 | 14 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 (72%) |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:infrared | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:optical | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].local:modality:imaging | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (75%) |
| 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 |