Stellar Archaeology as a Time Machine to the First Stars

Session

CEMP Stars: Theory

6 Dec 2018, 12:20

Lecture Hall (Kavli IPMU)

61. Low-mass primordial stars: i-process nucleosynthesis during core-flash proton ingestion episodes?

Simon Campbell (Monash University Australia)

06/12/2018, 12:20

Carbon enhanced metal-poor stars

Models of zero metallicity and extremely metal-poor stars show that they evolve differently to their more metal-rich counterparts. In particular they suffer violent proton-ingestion episodes (PIEs) that lead to extreme carbon enrichment at the surface. The fresh carbon has a fundamental effect on their further evolution, and can be transferred to binary companions, producing CEMP stars. As...

1. Carbon-enhanced metal-poor stars as a consequence of inhomogeneous metal mixing

Tilman Hartwig (IPMU, the Univ. of Tokyo)

06/12/2018, 12:40

Carbon enhanced metal-poor stars

I will present a novel scenario for the formation of carbon-enhanced metal-poor (CEMP) stars. Carbon enhancement at low stellar metallicities is usually considered a consequence of faint or other exotic supernovae. A simple analytical estimate of cooling times in low-metallicity gas demonstrates a natural bias to the formation of CEMP stars as a consequence of inhomogeneous metal mixing:...