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FNWI --- IMAPP Department of Astrophysics
Radboud University > Faculty of Science > Department of Astrophysics

Carbon-Enhanced Metal-Poor stars

Among the very metal-poor stars observed in the Galactic halo there is a large fraction of stars which show a great enhancement in the abundance of carbon and other heavy elements. These stars are called CEMP (Carbon-Enhanced Metal-Poor) stars. One explanation of these observed enhancements is that in the past CEMP stars have undergone mass transfer from an AGB binary companion. This scenario is supported by the evidence that CEMP stars are mostly found in spectroscopic binary systems. Dfferent aspects still need to be clarified:

  1. the efficiency of the mass transfer process and its effects on the dynamic of the system;
  2. the consequences of this mass transfer for the overall population of metal poor stars and
  3. its implications for the initial mass function at early epochs.
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