Scl-1013644: a CEMP-s star in the Sculptor dwarf spheroidal galaxy

• Published in: Monthly notices of the Royal Astronomical Society Vol. 463; no. 1; pp. 598 - 603
• Main Authors: Salgado, C., Da Costa, G. S., Yong, D., Norris, J. E.
• Format: Journal Article
• Language: English
• Published: London Oxford University Press 21-11-2016
• Subjects: Aluminum; Carbon; Chemical elements; Dwarf galaxies; Dwarf stars; Metallicity; Milky Way; Nitrogen; Red giant stars; Satellites; Spectrum analysis; Star & galaxy formation; Stars; galaxies: dwarf; galaxies: individual: (Sculptor dwarf spheroidal); galaxies: abundances; Galaxy: abundances
• ISSN: 0035-8711; 1365-2966
• DOI: 10.1093/mnras/stw1986

Recent studies of the Milky Way and its satellites have paid special attention to the importance of carbon-enhanced metal-poor (CEMP) stars due to their involvement in Galactic formation history and their possible connection with the chemical elements originating in the first stellar generation. In an ongoing study of red giants in the Sculptor dwarf galaxy, we have discovered a star with extremely strong CN and CH molecular bands. This star, Scl-1013644, has previously been identified by Geisler et al. as a star with an enrichment in the heavy elements. Spectrum synthesis has been used to derive the carbon, nitrogen and barium abundances for Scl-1013644. Our findings are [C/Fe] = +0.8, [N/Fe] = −0.3 and [Ba/Fe] = +2.1 with the latter result consistent with the value found by Geisler et al. These results reveal Scl-1013644 as a CEMP-s star, the third such star discovered in this dwarf galaxy.