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3 results

  • Helium variations in Galactic and extragalactic Globular Clusters

  • Edoardo P. Lagioia, Antonino P. Milone, Anna F. Marino, Aaron Dotter, Giacomo Cordoni, Marco Tailo
  • Journal:
    Proceedings of the International Astronomical Union / Volume 14 / Issue S351 / May 2019
    Published online by Cambridge University Press:
    11 March 2020, pp. 312-316
    Print publication:
    May 2019
    • Article
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  • The recent measurements of internal variations of helium in Galactic and extragalactic Globular Clusters (GCs) set binding constraints to the models of formation of Multiple Populations (MPs) in GCs, and gave rise, at the same time, to crucial questions related with the influence of the environment on MP formation as well as with the role played by GCs in the early galactic formation. We present the most recent estimates of helium enrichment in the main populations of a large sample of Galactic and extragalactic GCs.

  • 21 - Population and Spectral Synthesis: It Doesn’t Work without Binaries

  • Edited by Giacomo Beccari, European Southern Observatory, Garching, Henri M. J. Boffin, European Southern Observatory, Garching
  • Book:
    The Impact of Binary Stars on Stellar Evolution
    Published online:
    05 April 2019
    Print publication:
    18 April 2019, pp 307-328

  • Summary

    This chapter discusses the population and spectral synthesis of stellar populations. It describes the method required to achieve such synthesis and discusses examples where inclusion of interacting binaries are vital to reproducing the properties of observed stellar systems. These examples include the Hertzsprung–Russel diagram, massive star number counts, core-collapse supernovae and the ionising radiation from stellar populations that power both nearby HII regions and the epoch of reionization. It finally offers some speculations on the future paths of research in spectral synthesis.

  • Multiple populations in globular clusters

  • Giampaolo Piotto
  • Journal:
    Proceedings of the International Astronomical Union / Volume 2 / Issue 14 / August 2006
    Published online by Cambridge University Press:
    01 August 2006, pp. 434-435
    Print publication:
    August 2006
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  • I briefly present the most relevant observational facts supporting the idea of one or more star formation episodes in globular clusters.