Scl-1013644: a CEMP-s star in the Sculptor Dwarf Spheroidal Galaxy

TL;DR

This paper reports the discovery and analysis of Scl-1013644, a carbon-enhanced metal-poor star with s-process element enrichment in the Sculptor dwarf galaxy, providing insights into early stellar populations.

Contribution

It presents the identification and detailed chemical abundance analysis of the third CEMP-s star in the Sculptor dwarf galaxy, expanding understanding of stellar evolution in dwarf galaxies.

Findings

Scl-1013644 is a CEMP-s star with [C/Fe]=+0.8, [N/Fe]=-0.3, [Ba/Fe]=+2.1.

The star shows strong CN and CH molecular bands.

The discovery links chemical enrichment processes in dwarf galaxies to early stellar populations.

Abstract

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. (2005) 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. (2005). These results reveal Scl-1013644 as a CEMP-s star, the third such star discovered in this dwarf galaxy.