Investigation of a sample of carbon-enhanced metal-poor stars observed with FORS and GMOS
Aims: Carbon-enhanced metal-poor (CEMP) stars represent a sizeable fraction of all known metal-poor stars in the Galaxy. Their formation and composition remains a significant topic of investigation within the stellar astrophysics community.
Methods: We analysed a sample of low-resolution spectra of 30 dwarf stars, obtained using the visual and near UV FOcal Reducer and low dispersion Spectrograph for the Very Large Telescope (FORS/VLT) of the European Southern Observatory (ESO) and the Gemini Multi-Object Spectrographs (GMOS) at the GEMINI telescope, to derive their metallicity and carbon abundance.
Results: We derived C and Ca from all spectra, and Fe and Ba from the majority of the stars.
Conclusions: We have extended the population statistics of CEMP stars and have confirmed that in general, stars with a high C abundance belonging to the high C band show a high Ba-content (CEMP-s or -r/s), while stars with a normal C abundance or that are C-rich, but belong to the low C band, are normal in Ba (CEMP-no).
Astronomy and Astrophysics
- Pub Date:
- June 2018
- stars: Population II;
- stars: abundances;
- Galaxy: abundances;
- Galaxy: formation;
- Galaxy: halo;
- Astrophysics - Solar and Stellar Astrophysics