The bottleneck of CNO burning and the age of Globular Clusters

G. Imbriani, H. Costantini, A. Formicola, D. Bemmerer, R. Bonetti, C. Broggini, P. Corvisiero, J. Cruz, Z. Fülöp, G. Gervino, A. Guglielmetti, C. Gustavino, G. Gyürky, A. P. Jesus, M. Junker, A. Lemut, R. Menegazzo, P. Prati, V. Roca, C. RolfsM. Romano, C. Rossi Alvarez, F. Schümann, E. Somorjai, O. Straniero, F. Strieder, F. Terrasi, H. P. Trautvetter, A. Vomiero, S. Zavatarelli

Research output: Contribution to journalArticle

132 Citations (Scopus)


The transition between the Main Sequence and the Red Giant Branch in low mass stars is powered by the onset of CNO burning, whose bottleneck is 14N(p, γ) 15O. The LUNA collaboration has recently improved the low energy measurements of the cross section of this key reaction. We analyse the impact of the revised reaction rate on the estimate of the Globular Cluster ages, as derived from the turnoff luminosity. We found that the age of the oldest Globular Clusters should be increased by about 0.7-1 Gyr with respect to the current estimates.

Original languageEnglish
Pages (from-to)625-629
Number of pages5
JournalAstronomy and Astrophysics
Issue number2
Publication statusPublished - Jun 1 2004


  • Cosmology: distance scale
  • Galaxy: formation
  • Galaxy: globular clusters: general
  • Nuclear reactions, nucleosynthesis, abundances
  • Stars: evolution
  • Stars: population II

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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  • Cite this

    Imbriani, G., Costantini, H., Formicola, A., Bemmerer, D., Bonetti, R., Broggini, C., Corvisiero, P., Cruz, J., Fülöp, Z., Gervino, G., Guglielmetti, A., Gustavino, C., Gyürky, G., Jesus, A. P., Junker, M., Lemut, A., Menegazzo, R., Prati, P., Roca, V., ... Zavatarelli, S. (2004). The bottleneck of CNO burning and the age of Globular Clusters. Astronomy and Astrophysics, 420(2), 625-629.