Table · dataset · 2026
HD 140283 and BPS CS 29502-0092 equivalent widths
Listed in IVOA Registry (Virtual Observatory)
The aim of this study is to evaluate the reliability of spectroscopic and photometric approaches for deriving stellar parameters in metal-poor stars, focusing on a carbon-enhanced metal-poor (CEMP) star with a well-studied very metal-poor star as reference.
Description
The determination of stellar parameters is first based on spectroscopy, where parameters are derived from Fe line equivalent widths using the 1D local thermodynamical equilibrium (LTE) synthesis code pyMOOGi.
The second approach is based on photometry, employing colour-Teff relations, Gaia parallaxes, and bolometric corrections. Analyses of the two stars reveal systematic discrepancies: photometric Teff, log(g), and [Fe/H] are higher than spectroscopic values. Offsets exceed uncertainties, mainly due to the limited Fe II line set and non-LTE effects in spectroscopy.
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Photometric based parameters prove more consistent and reliable, particularly when using (V-K) or (BP-K) colours. These findings confirm previous results and demonstrate that photometric methods yield more reliable stellar parameters, especially for CEMP stars than 1D LTE spectroscopic methods.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/708/L17 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2026A&A...708L..17H ui.adsabs.harvard.edu/abs/2026A%26A...708L..17H ↗
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/708/l17 ↗
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/708/l17 | 15 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 |