期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 468, 期 1, 页码 418-425出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx480
关键词
stars: abundances; stars: formation; stars: Population III; supernovae: general
资金
- European Union FP7 programme through ERC [320360]
- Royal Society - Science Foundation Ireland University Research Fellowship
- Australian Research Council through a Future Fellowship [FT120100363]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1430152] Funding Source: National Science Foundation
Extremely metal-poor (EMP) stars are uniquely informative on the nature of massive Population III stars. Modulo a few elements that vary with stellar evolution, the present-day photospheric abundances observed in EMP stars are representative of their natal gas cloud composition. For this reason, the chemistry of EMP stars closely reflects the nucleosynthetic yields of supernovae from massive Population III stars. Here we collate detailed abundances of 53 EMP stars from the literature and infer the masses of their Population III progenitors. We fit a simple initial mass function (IMF) to a subset of 29 of the inferred Population III star masses, and find that the mass distribution is well represented by a power-law IMF with exponent alpha = 2.35(-0.24)(+0.29). The inferred maximum progenitor mass for supernovae from massive Population III stars is M-max = 87(-33)(+13) M (circle dot), and we find no evidence in our sample for a contribution from stars with masses above similar to 120 M-circle dot. The minimum mass is strongly consistent with the theoretical lower mass limit for Population III supernovae. We conclude that the IMF for massive Population III stars is consistent with the IMF of present-day massive stars and there may well have formed stars much below the supernova mass limit that could have survived to the present day.
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