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Photograph of Ross Church

Ross Church

Senior lecturer

Photograph of Ross Church

Thermohaline mixing and the variation of [C/Fe] with magnitude in M3


  • George C. Angelou
  • John C. Lattanzio
  • Ross P. Church
  • Richard J. Stancliffe
  • David S. Dearborn
  • Graeme H. Smith
  • Christopher A. Tout
  • Verne V. Smith

Summary, in English

We use observations of M3 to constrain thermohaline mixing. This is done by matching [C/Fe] and [N/Fe] along the RGB of M3. We find our models can explain observations if it is assumed there is a spread of ∼ 0.3 - 0.4 dex in [C/Fe] in the stars in M3 from their birth. We reproduce the full spread in [C/Fe] at the tip of the RGB. Thermohaline mixing can produce a significant change in [N/Fe] as a function of absolute magnitude on the RGB for initially CN-weak stars, but not for initially CN-strong stars, which have so much nitrogen to begin with that any deep mixing does not significantly affect the surface nitrogen composition.


  • Lund Observatory

Publishing year





Proceedings of Science

Document type

Conference paper


  • Astronomy, Astrophysics and Cosmology

Conference name

11th Symposium on Nuclei in the Cosmos, NIC 2010

Conference date

2010-07-19 - 2010-07-23

Conference place

Heidelberg, Germany