Discovery of Carbon/Oxygen-depleted Blue Straggler Stars in 47 Tucanae: The Chemical Signature of a Mass Transfer Formation Process Academic Article uri icon

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  • We use high-resolution spectra obtained with the ESO Very Large Telescope to measure surface abundance patterns of 43 Blue Stragglers stars (BSS) in 47 Tuc. We discovered that a sub-population of BSS shows a significant depletion of Carbon and Oxygen with respect to the dominant population. This evidence would suggest the presence of CNO burning products on the BSS surface coming from a deeply peeled parent star, as expected in the case of mass-transfer process. This is the first detection of a chemical signature clearly pointing to a specific BSS formation process in a globular cluster.


  • Ferraro, FR
  • Sabbi, E
  • Gratton, R
  • Piotto, G
  • Lanzoni, B
  • Carretta, E
  • Rood, RT
  • Sills, Alison
  • Fusi Pecci, F
  • Moehler, S
  • Beccari, G
  • Lucatello, S
  • Compagni, N

publication date

  • August 10, 2006