Table · dataset · 2026
RRL abundances in Baade's Window
Listed in IVOA Registry (Virtual Observatory)
The shape and kinematics of the metal-poor stellar component of the Galactic bulge remain poorly characterized, so its origin is still weakly constrained.
Description
RR Lyrae (RRL) stars trace this old, relatively metal-poor component and, thanks to precise distances, allow orbits to be computed while minimizing contamination. So far no medium/high-resolution spectroscopic study had targeted bulge RRL.
We present a spectroscopic determination of iron and alpha-element abundances for RRL stars in two fields of Baade's Window, a low-extinction bulge window, with the goal of providing a benchmark to calibrate photometric metallicity indicators for this population. We analysed FLAMES/GIRAFFE HR10 spectra of 78 RRL (60 ab-type and 18 c-type) using a full-spectrum fitting technique (FERRE) to derive the spectroscopic metallicity and the overall alpha-element abundance.
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Distances were obtained from a period-luminosity-metallicity relation, and orbits were computed by combining the radial velocities derived here with Gaia DR3 proper motions. The metallicity distributions peak at [Fe/H]_median_=-1.34+/-0.04 and -1.44+/-0.08dex for ab- and c-type stars, respectively, with relatively high alpha-element abundances around [a/Fe] ~ 0.25 dex. The spectroscopic values are used to test several photometric metallicity methods, which show systematic offsets.
A few ab-type RRL with [Fe/H]>-1 dex and low [a/Fe] show disk-like kinematics, suggesting a possible second, slightly younger RRL population in the bulge region.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/711/A288 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2026A&A...711A.288O ui.adsabs.harvard.edu/abs/2026A%26A...711A.288O ↗
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/711/a288 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 68%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/711/a288 | 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 (68%) |
| 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 |