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Journal article
THE FRACTION OF GLOBULAR CLUSTER SECOND-GENERATION STARS IN THE GALACTIC HALO
Astrophysical journal. Letters, v 718(2), pp L112-L116
01 Aug 2010
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Many observational studies have revealed the presence of multiple stellar generations in Galactic globular clusters. These studies suggest that second-generation stars make up a significant fraction of the current mass of globular clusters, with the second-generation mass fraction ranging from similar to 50% to 80% in individual clusters. In this Letter, we carry out hydrodynamical simulations to explore the dependence of the mass of second-generation stars on the initial mass and structural parameters and stellar initial mass function (IMF) of the parent cluster. We then use the results of these simulations to estimate the fraction f(SG,H) of the mass of the Galactic stellar halo composed of second-generation stars that originated in globular clusters. We study the dependence of f(SG,H) on the parameters of the IMF of the Galactic globular cluster system. For a broad range of initial conditions, we find that the fraction of mass of the Galactic stellar halo in second-generation stars is always small, f(SG,H) < 4%-6% for a Kroupa-1993 IMF and f(SG,H) < 7%-9% for a Kroupa-2001 IMF.
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Details
- Title
- THE FRACTION OF GLOBULAR CLUSTER SECOND-GENERATION STARS IN THE GALACTIC HALO
- Creators
- Enrico Vesperini - Drexel UniversityStephen L. W. McMillan - Drexel UniversityFrancesca D'Antona - National Institute for AstrophysicsAnnibale D'Ercole - Osservatorio astronomico di Bologna
- Publication Details
- Astrophysical journal. Letters, v 718(2), pp L112-L116
- Publisher
- Iop Publishing Ltd
- Number of pages
- 5
- Grant note
- AST-0708299 / NSF; National Science Foundation (NSF) NNX07AG95G; NNX08AH15G; NNX10AD86G / NASA; National Aeronautics & Space Administration (NASA) 2007JJC53X / Italian MIUR; Ministry of Education, Universities and Research (MIUR) 20075TP5K9 / PRIN; Ministry of Education, Universities and Research (MIUR); Research Projects of National Relevance (PRIN)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000280710700014
- Scopus ID
- 2-s2.0-78349303480
- Other Identifier
- 991019167562404721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics