CEMP stars
type: Concept
contributor: AAS Frey.Katie
created: 2018-09-17T18:11:30Z
creator: AAS Frey.Katie Admin
modified: 2020-10-26T19:34:38.248Z
modified: 2020-10-26T19:34:27.131Z
alternative label: Carbon enhanced metal poor stars
broader: Chemically peculiar stars
definition: A star that presents very low iron abundances [Fe/H] < -4 but an anomalous richness in carbon. CEMP stars have been defined as a subset of metal-poor stars that exhibit elevated [C/Fe] ≥ +1.0. It has been recognized that ~15-20% of stars with [Fe/H] < -2.0 are carbon enhanced. This fraction rises to 30% for [Fe/H] < -3.0, to 40% for [Fe/H] < -3.5, and ~75% for [Fe/H] < -4.0. This increasing trend of CEMP-star frequency with declining [Fe/H] is confirmed by the observation of many thousands of CEMP stars.

Chemically peculiar stars
type: Concept
narrower: CEMP stars