Abstract Details
| Name: Akash P Affiliation: University of Calicut Conference ID: ASI2025_219 Title : Investigating the Physical and Chemical Characteristics of C-J type carbon stars Authors and Co-Authors : Akash P 1, Drisya Karinkuzhi 1,2, Sophie Van Eck 2 Abstract Type : Poster Abstract Category : Stars, Interstellar Medium, and Astrochemistry in Milky Way Abstract : Carbon stars serve as an important class of stars that can provide valuable insight into the evolution of stars and nucleosynthesis at various stages of their evolution. In general, carbon stars are classified as intrinsic stars, which produce carbon internally, and extrinsic stars, which gain carbon through binary mass transfer. Additionally, carbon stars are further classified based on their spectral characteristics into four subgroups: C-H, C-N, C-J, and C-R. Every subgroup represents a specific stage of stellar evolution. Among these subgroups, C-J and C-R carbon stars are the least explored. C-J and C-R stars often lack heavy elements associated with neutron-capture processes, which suggests their unique origins, in contrast to typical carbon stars that formed during the Asymptotic Giant Branch (AGB) phase. We investigated the origin and evolutionary state of C-J-type carbon stars in a recent study. We selected a sample of 300 C-J stars from Lamost data release 4. As a first step toward understanding their origin, we explored their chemical and kinematic properties. In addition, their binarity is assessed using the Renormalised Unit Weight Error (RUWE) of the GAIA survey. The preliminary results from our analyses will be presented during the meeting. |