Table · dataset · 2026
C-MetaLL survey. IX. Cepheid data
Listed in IVOA Registry (Virtual Observatory)
The C-MetaLL project has provided homogeneous spectroscopic abundances of 290 Classical Cepheids (DCEPs) for which we have the intensity-averaged magnitudes in multiple optical and near-infrared (NIR) bands, periods, pulsation modes, and Gaia parallaxes corrected for individual zero-point (ZP) biases.
Description
Our goal is to derive updated period-Wesenheit-metallicity (PWZ) relations using the largest and most homogeneous metallicity sample ever used for such analyses, covering a range of -1.3<[Fe/H]<+0.3dex, and to assess the metallicity dependence of these relations.
We computed several optical and NIR Wesenheit magnitudes adopting both Cardelli et al. and Fitzpatrick reddening laws, and transformed Johnson-Cousins Wesenheit magnitudes into their HST equivalents using empirical relations. Using 275 DCEPs with reliable parallaxes, we applied a robust photometric parallax technique, which simultaneously fits all parameters --- including the global ZP counter-correction to Gaia parallaxes --- and handles outliers via a Cauchy likelihood to account for the sample's excess variance.
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We find a stronger metallicity dependence (gamma~-0.5mag/dex in optical, ~-0.4mag/dex in NIR) than recent literature reports. Gaia parallax ZP counter-correction epsilon varies smoothly across bands, with an average value of ~10 muas, aligning with previous determinations. Applying our PWZ relations to ~4500 LMC Cepheids yields distances generally consistent within 1 sigma with geometric estimates.
The choice of reddening law has a small impact, while using only fundamental-mode pulsators significantly increases the uncertainties. Including alpha-element corrections increases abs(gamma) and reduces epsilon. However, we find 1 sigma consistency gamma values with the literature, particularly for the Wesenheit magnitude in the HST bands, by restricting the sample to brighter (i.e. closer) objects, or by including only pulsators with -0.7<[Fe/H]<0.2dex.
Our results hint at a large gamma or a non-linear dependence on metallicity of DCEP luminosities at the metal-poor end, which is difficult to quantify with the precision of parallaxes of the present dataset.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/708/A216 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2026A&A...708A.216R ui.adsabs.harvard.edu/abs/2026A%26A...708A.216R ↗
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/a216 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 71%
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/708/a216 | 13 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 (71%) |
| concepts[field].local:field:astronomy | mapping · 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 |