University of Hertfordshire

By the same authors

Boron depletion in 9 to 15 M(circle dot) stars with rotation

Research output: Chapter in Book/Report/Conference proceedingConference contribution


  • U. Frischknecht
  • R. Hirschi
  • G. Meynet
  • S. Ekstroem
  • C. Georgy
  • T. Rauscher
  • C. Winteler
  • F-K. Thielemann
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Original languageEnglish
Title of host publicationLight Elements in the Universe
EditorsC. Charbonnel, M. Tosi, F. Primas, C. Chiappini
PublisherCambridge University Press
Number of pages2
ISBN (Print)978-0-521-76506-0
Publication statusPublished - 2010
Event268th Symposium of the International-Astronomical-Union - Geneva, Switzerland
Duration: 9 Nov 200913 Nov 2009

Publication series

NameProceedings of the IAU
ISSN (Print)1743-9213


Conference268th Symposium of the International-Astronomical-Union


The treatment of mixing is still one of the major uncertainties in stellar evolution models. One open question is how well the prescriptions for rotational mixing describe the real effects. We tested the mixing prescriptions included in the Geneva stellar evolution code (GENEC) by following the evolution of surface abundances of light isotopes in massive stars, such as boron and nitrogen. We followed 9, 12 and 15 M(O) models with rotation from the zero age main sequence up to the end of He burning. The calculations show the expected behaviour with faster depletion of boton for faster rotating stars and more massive stars. The mixing at the surface is more efficient, than predicted by prescriptions used in other codes and reproduces the majority of observations very well However two observed stars with strong boron depletion but, no nitrogen enhancement still can not be explained and let the question open whether additional mixing processes are acting in these massive stars

ID: 1619689