open access

https://hdl.handle.net/2115/42826

Evolution of Dust in Primordial Supernova Remnants and Its Influence on the Elemental Composition of Hyper-Metal-Poor Stars

英語

PACS=98.38.Mz

2008-05-21

American Institute of Physics

AIP Conference Proceedings

1016(1)

55-60

Origin of Matter and Evolution of Galaxies: The 10th International Symposium on Origin of Matter and Evolution of Galaxies: From the Dawn of Universe to the Formation of Solar System. 4–7 December 2007. Sapporo, Japan.

The calculations for the evolution of dust within Population III supernova remnants (SNRs) are presented, based on the models of dust formed in the unmixed ejecta of Type II SNe. We show that once dust grains collide with the reverse shock penetrating into the ejecta, their fates strongly depend on the initial radius a_ini. For SNRs expanding into the interstellar medium (ISM) with n_[H,0] = 1 cm^[−3], grains of a_ini<0.05 µm are trapped in the hot gas to be completely destroyed; grains of a_ini = 0.05–0.2 µm are piled up in the dense shell formed behind the forward shock; grains of a_ini>0.2 µm are injected into the ISM without being eroded significantly. The total mass of surviving dust is 0.01 to 0.8 M☉ for n_[H,0] = 10 to 0.1 cm^[−3]. We also investigate the influence of the piled-up dust on the elemental abundances of the second-generation stars formed in the dense shell of Population III SNRs. The comparison of the calculated elemental abundances with those observed in hyper-metal-poor (HMP) and ultra-metal-poor (UMP) stars indicates that the transport of dust separated from metal-rich gas can be an important process in determining the abundance patterns of Mg and Si in HMP and UMP stars.

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Copyright 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in AIP Conf. Proc., 2008, Volume 1016, pp. 55-60, and may be found at https://dx.doi.org/10.1063/1.2943632

0094-243X

BA00284604