Article open access publication

The role of binaries in the enrichment of the early Galactic halo - II. Carbon-enhanced metal-poor stars: CEMP-no stars

Astronomy & Astrophysics, EDP Sciences, ISSN 0004-6361

Volume 586, 2016

DOI:10.1051/0004-6361/201527235, Dimensions: pub.1056924337,



  1. (1) Heidelberg University, grid.7700.0
  2. (2) Aarhus University, grid.7048.b, AU
  3. (3) University of Copenhagen, grid.5254.6, KU
  4. (4) University of Notre Dame, grid.131063.6
  5. (5) Harvard-Smithsonian Center for Astrophysics, grid.455754.2


Context. The detailed composition of most metal-poor halo stars has been found to be very uniform. However, a fraction of 20−70% (increasing with decreasing metallicity) exhibit dramatic enhancements in their abundances of carbon; these are the so-called carbon-enhanced metal-poor (CEMP) stars. A key question for Galactic chemical evolution models is whether this non-standard composition reflects that of the stellar natal clouds or is due to local, post-birth mass transfer of chemically processed material from a binary companion; CEMP stars should then all be members of binary systems.


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