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1 results

  • Terzan 5: a pristine fragment of the Bulge

  • Francesco R. Ferraro
  • Journal:
    Proceedings of the International Astronomical Union / Volume 10 / Issue H16 / August 2012
    Published online by Cambridge University Press:
    05 March 2015, pp. 243-244
    Print publication:
    August 2012
    • Article
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  • We have discovered that Terzan 5, a stellar system in the Galactic Bulge, harbors two stellar populations with different iron content (Δ[Fe/H] ~ 0.5 dex) and possibly different ages. Moreover, the observed chemical patterns significantly differ from those observed in any known genuine globular cluster. These evidences demonstrate that, similarly to ω Centauri in the Halo, Terzan 5 is not a globular cluster, but a stellar system that was able to retain the gas ejected by violent supernova explosions. Moreover the striking chemical similarity with the Bulge stars suggests that Terzan 5 could be the relic of one of the massive clumps that contributed (through strong dynamical interactions with other pre-formed and internally-evolved sub-structures) to the formation of the Galactic Bulge.