The Search and Study of CEMP Stars

We report on the results of the observation and study of carbon-enhanced metal-poor (CEMP) stars. Using high resolution (R ~ 40,000) spectroscopic observations taken at the Southern African Large Telescope (SALT) of over 100 metal-poor stars we measured elemental abundances and then used these measurements to assign stars to a variety of chemically peculiar stellar classifications. Of particular interest were CEMP stars and classifications based on n-capture abundances. We found 17 CEMP stars, 11 were newly discovered, 38 r-I stars, 31 were newly discovered, and 11 r-II stars, 8 newly discovered. We then complied a sample of CEMP stars, classified as such by medium and high resolution (R >= 4,350) spectroscopy. We then used 6D position and velocity information from Gaia and the spectroscopic observation to derive orbital parameters using the AGAMA program. We then performed a density based clustering over the orbital energy and actions (E, J_{r}, J_{phi}, J_{Z}) using HDBSCAN. We then separated our sample of CEMP stars with orbital parameters by CEMP morphological groups and performed a statistical analysis of the similarities between the elemental abundances within the different clusters of stars. We demonstrate that the carbon abundance of Group II CEMP stars can't be explained by local events, unlike Group I CEMP stars.