Table · dataset · 2026
XP-TEAL. Balmer lines in open clusters
Listed in IVOA Registry (Virtual Observatory)
The third Gaia data release (Gaia DR3) includes blue and red low-resolution spectrophotometry for more than 200 million sources.
Description
These Gaia XP spectra are represented by sets of coefficients multiplying linear combinations of basis functions related to Hermite functions. In a previous work we introduced a method that maximally exploits the information encoded in the Gaia spectrophotometric coefficients in order to identify absorption and emission lines.
Our aim is to detect hydrogen Balmer emission and absorption lines in stars belonging to open clusters included in the released Gaia DR3 blue and red spectrophotometry and characterise the Balmer line strengths as a function of colour. We refine our XP Tool for Emission and Absorption Lines (XP-TEAL) based on the analysis of the derivatives of the spectral coefficients to analyse hydrogen Balmer lines in the Gaia DR3 XP spectra using the derivatives of the internal Gaia DR3 XP spectra.
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We test our results using stars in open clusters, considering both absorption and emission features. The analysis of the hydrogen lines in spectra of open cluster stars allows us to assess the performance and limitations of the method. We find an empirical dependence of the absorption-line equivalent widths on the intrinsic colour of the stars that allows us to derive precise colour excesses caused by interstellar extinction.
We also identified 1256 stars with emission lines (356 of them unknown in the literature). We successfully tested our XP-TEAL code on stars belonging to clusters and make both the source code and the online version available to the community. Despite the low resolution of Gaia spectrophotometry, our code has proven to be able to extract useful line information from it.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/711/A215 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2026A&A...711A.215C ui.adsabs.harvard.edu/abs/2026A%26A...711A.215C ↗
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/a215 ↗
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/711/a215 | 13 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 |