Table · dataset · 2025
EWs from NIR-spectra of Cool giants stars
Listed in IVOA Registry (Virtual Observatory)
We explored here the near-infrared H-band atmospheric window aiming to provide quantitative diagnostic tools for deriving stellar parameters, for instance, effective temperature (T_eff_) and metallicity ([Fe/H]), of cool giants (Teff < 5000 K) using low-resolution spectra.
Description
We obtained 177 cool giants from the X-shooter spectral library covering a wider metallicity range (-2.35 dex < [Fe/H] < 0.5 dex) than in earlier works.
Degrading the spectral resolution to R ~ 1200, we estimated equivalent widths of several important spectral features, and the behaviour of spectral features with stellar parameters are studied. Also, the empirical relations for deriving Teff and [Fe/H] are established in the Bayesian framework. We found that ^12^CO at 1.56 and 1.62 {mu}m, and ^12^CO + MgI at 1.71 {mu}m are the best three T_eff_ indicators with a typical accuracy of 153, 123, and 107 K, respectively.
Read the rest (2 more)
The cubic Bayesian model provides the best metallicity estimator with a typical accuracy of 0.22, 0.28, and 0.24 dex for FeH at 1.62 {mu}m, ^12^CO at 1.64 {mu}m, and Fe I at 1.66 {mu}m, respectively. We also showed a detailed quantitative metallicity dependence of Teff-EWs correlations defining three metallicity groups, supersolar ([Fe/H] > 0.0 dex), solar (-0.3 dex < [Fe/H] < 0.3 dex), and subsolar ([Fe/H] <-0.3 dex), from Hierarchical Bayesian modelling.
The difference between the solar and subsolar relationship is statistically significant, but such difference is not evident between the solar and supersolar groups.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/511/814 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2022MNRAS.511..814G ui.adsabs.harvard.edu/abs/2022MNRAS.511..814G ↗
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/511/814 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Infrared
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/mnras/511/814 | 11 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:infrared | 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 |