Table · dataset · 2025
Hydra spectroscopy of stars in NGC 2204
Listed in IVOA Registry (Virtual Observatory)
We have analyzed high-dispersion spectra in the Li 6708{AA} region for 167 stars within the anticenter cluster NGC 2204.
Description
From 105 probable members, abundance analysis of 45 evolved stars produces [Fe/H]=-0.40+/-0.12, [Si/Fe]=0.14+/-0.12, [Ca/Fe]=0.29+/-0.07, and [Ni/Fe]=-0.12+/-0.10, where quoted errors are standard deviations. With E(B-V)=0.07 and (m-M)_0_=13.12, appropriate isochrones provide an excellent match from the main sequence through the tip of the giant branch for an age of 1.85+/-0.05Gyr.
Li spectrum synthesis produces A(Li) below 1.4 at the base of the red giant branch to a detectable value of -0.4 at the tip. Six probable asymptotic giant branch stars and all but one red clump star have only Li upper limits. A rapidly rotating red giant is identified as a possible Li-rich giant, assuming it is a red clump star.
Read the rest (2 more)
Main-sequence turnoff stars have a well-defined A(Li)=2.83+/-0.03 (sem) down to the Li-dip wall at the predicted mass of 1.29M_{sun}_. Despite having the same isochronal age as the more metal-rich NGC 2506, the luminosity distribution of red giants reflects a younger morphology similar to NGC 7789, possibly indicating a deeper impact of metallicity on stellar structure and A(Li) than previously assumed. As in NGC 2506 and NGC 7789, the NGC 2204 turnoff exhibits a broad range of rotation speeds, making abundance estimation impossible for some stars.
The place of the cluster within Galactic A(Li) evolution is discussed.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/168/103 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2024AJ....168..103A ui.adsabs.harvard.edu/abs/2024AJ....168..103A ↗
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/aj/168/103 ↗
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/aj/168/103 | 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 |