Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-06
Astrophys.J.596:L187-L190,2003
Astronomy and Astrophysics
Astrophysics
5 pages, 2 figures, accepted for publication in ApJ Letter
Scientific paper
10.1086/379531
We explore a scenario where metal-poor globular clusters (GCs) are enriched by the first supernovae in the Universe. If the first stars in a 10^7 Msun dark halo were very massive (>180 Msun), then a pair instability supernova from a single massive star can produce sufficient iron to enrich 10^6 Msun of pristine, primordial gas to [Fe/H] ~ -2. In such a scenario, where a single massive star acts as a seed for halo GCs, the accurate abundance analysis of GC stars would allow a direct measurement of the Population III initial mass. Using the latest theoretical yields for zero metallicity stars in the mass range 140-260 Msun, we find that the metals expelled from a ~230 Msun 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 masses for the Population III stellar progenitors. The various observational consequences of this scenario are discussed.
Beasley Michael A.
Forbes Duncan A.
Gibson Brad K.
Kawata Daisuke
Pearce Frazer R.
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