Table · dataset · 2025
Stellar evolution and age C and N indicators
Listed in IVOA Registry (Virtual Observatory)
Low- and intermediate-mass giants undergo a complex chemical evolution that has yet to be observationally probed.
Description
The influence of core helium-flash on the chemical composition of stellar atmospheres is an open question since its theoretical prediction 60 years ago. Based on high-resolution spectral observations of 44 open star clusters in the Gaia-ESO survey, our aim is to perform the first large-scale homogeneous investigation into the carbon and nitrogen photospheric content of low- and intermediate-mass giant stars in different phases of evolution.
Carbon and nitrogen abundances were determined using spectral synthesis of the C2 Swan (1,0) band head at 5135{AA} and C2 Swan (0,1) band head at 5635.5{AA}, ^12^C^14^N bands in the interval 6470-6490{AA}, and the forbidden [O I] line at 6300.31{AA}. Results. We revealed differences in C/N abundance ratios between pre- and post-core-He-flash stars.
Read the rest (3 more)
The lower C/N ratios in core He-burning red clump stars are mainly due to the enhancement of nitrogen abundances. We presented calibrations of the relationship between [C/N] and stellar age for solar metallicity low- and intermediate-mass giants taking into account different evolutionary stages. The C/N abundance ratios in the investigated first-ascent giant stars are affected by the first dredge-up slightly less than predicted by the theoretical model of Lagarde et al. (2017A&A...601A..27L ).
The rotation-induced extra-mixing is not as efficient as predicted by the model of Lagarde et al. ( 2012A&A...543A.108L, Cat. J/A+A/543/A108). The core helium flash may trigger additional alterations in carbon and nitrogen abundances that are not yet theoretically modelled.
We found that the evolutionary stage of stars must be taken into account when using [C/N] as an age indicator.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/703/A4 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025A&A...703A...4T ui.adsabs.harvard.edu/abs/2025A%26A...703A...4T ↗
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/703/a4 ↗
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/703/a4 | 12 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 |