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Home List of Titles The metallicity of pregalactic globular clusters: the observational consequences of the first stars
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/1180
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- The metallicity of pregalactic globular clusters: the observational consequences of the first stars
- Beasley, Michael A.; Kawata, Daisuke; Pearce, Frazer R.; Forbes, Duncan A.; Gibson, Brad K.
- We explore a scenario in which metal-poor globular clusters (GCs) are enriched by the first supernovae in the universe. If the first stars in a 107 Msolar dark halo were very massive (>180 Msolar), then a pair-instability supernova from a single massive star could produce sufficient iron to enrich 106 Msolar of pristine, primordial gas to [Fe/H]~-2. In such a scenario, in which a single massive star acts as a seed for halo GCs, an accurate abundance analysis of GC stars would allow us to directly measure the Population III initial mass. Using the latest theoretical yields for zero-metallicity stars in the mass range of 140-260 Msolar, we find that the metals expelled from an ~230 Msolar star are consistent with [Si/Fe] and [Ca/Fe] observed in GC stars. However, no single star in this mass range can simultaneously explain all halo GC heavy-element abundance ratios, such as [V/Fe], [Ti/Fe], and [Ni/Fe]. These require a combination of masses for the Population III stellar progenitors. The various observational consequences of this scenario are discussed.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Centre for Astrophysics and Supercomputing
- Astrophysical Journal Letters, Vol. 596, no. 2 (Oct 2003), pp. L187-L190
- Publication year
- Abundances; Early universe; Globular clusters; Star formation
- University of Chicago Press
- Publisher URL
- Copyright © 2003 The American Astronomical Society. Paper reproduced here in accordance with the copyright policy of the publisher.
- Full text
- Peer reviewed