2008年
Evolution of newly formed dust in Population III supernova remnants and its impact on the elemental composition of Population II.5 stars
LOW-METALLICITY STAR FORMATION: FROM THE FIRST STARS TO DWARF GALAXIES
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- 巻
- 4
- 号
- 255
- 開始ページ
- 254
- 終了ページ
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- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1017/S1743921308024903
- 出版者・発行元
- CAMBRIDGE UNIV PRESS
We investigate the evolution of dust formed in Population III supernovae (SNe) by considering its transport mid processing by sputtering within the SN remnants (SNRs). We find that; the fate of dust grains within SNRs heavily depends on their initial radii a(ini). For Type II SNRs expanding into the ambient medium with density of n(H,0) = 1 cm(-3), grains of a(ini) < 0.05 mu m SNRs expanding into the ambient medium with density of n(H,0) = 1 cm(-3) are detained in the shocked hot gas and are completely destroyed, while grains of a(ini) > 0.2 mu m are injected into the surrounding medium without being significantly destroyed. Grains with a(ini) =0.05-0.2 mu m are finally trapped in the dense shell behind the forward shock. We show that the grains piled up in the dense shell enrich the gas up to 10(-6)-10(-1) Z(circle dot), high enough to form low-mass, stars with 0.1-1 M-circle dot. In addition, [Fe/H] in the dense shell ranges from -6 to -4.5, which is in good agreement with the ultra-metal-poor stars with [Fe/H] < -4. We suggest that newly formed dust in a Population III SN can have great impact, on the stellar mass and elemental composition of Population II.5 stars formed in the shell of the SNR.
- リンク情報
- ID情報
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- DOI : 10.1017/S1743921308024903
- ISSN : 1743-9213
- eISSN : 1743-9221
- Web of Science ID : WOS:000263139600036