AGB dust and gas ejecta in extremely metal-poor environments

F. Dell'Agli, R. Valiante, D. Kamath, P. Ventura, D. A. García-Hernández

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We present asymptotic giant branch (AGB) models of metallicity Z = 10-4 and 3 × 10-4, with the aim of understanding how the gas enrichment and the dust production change in very metal-poor environments and to assess the general contribution of AGB stars to the cosmic dust yield. The stellar yields and the dust produced are determined by the change in the surface chemical composition, with a transition occurring at ~2.5M. Stars of massM<2.5M reach the carbon stage and produce carbon dust, whereas their higher mass counterparts produce mainly silicates and alumina dust; in both cases, the amount of dust manufactured decreases towards lower metallicities. The Z = 10-4 models show a complex and interesting behaviour on this side, because the efficient destruction of the surface oxygen favours the achievement of the C-star stage, independently of the initial mass. The present results might indicate that the contribution from this class of stars to the overall dust enrichment in metal-poor environments is negligible at redshifts z ≥ 5.

LanguageEnglish
Pages4738-4752
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume486
Issue number4
DOIs
Publication statusPublished - 1 Jul 2019

Fingerprint

ejecta
dust
metal
gases
gas
metals
metallicity
cosmic dust
stars
carbon stars
carbon
asymptotic giant branch stars
destruction
silicates
chemical composition
aluminum oxide
aluminum oxides
silicate
oxygen

Bibliographical note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 4, 21 July 2019, Pages 4738-4752, https://doi.org/10.1093/mnras/stz1164. Copyright 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Keywords

  • Stars: abundances
  • Stars: AGB and post-AGB

Cite this

Dell'Agli, F. ; Valiante, R. ; Kamath, D. ; Ventura, P. ; García-Hernández, D. A. / AGB dust and gas ejecta in extremely metal-poor environments. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 486, No. 4. pp. 4738-4752.
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Dell'Agli, F, Valiante, R, Kamath, D, Ventura, P & García-Hernández, DA 2019, 'AGB dust and gas ejecta in extremely metal-poor environments', Monthly Notices of the Royal Astronomical Society, vol. 486, no. 4, pp. 4738-4752. https://doi.org/10.1093/mnras/stz1164

AGB dust and gas ejecta in extremely metal-poor environments. / Dell'Agli, F.; Valiante, R.; Kamath, D.; Ventura, P.; García-Hernández, D. A.

In: Monthly Notices of the Royal Astronomical Society, Vol. 486, No. 4, 01.07.2019, p. 4738-4752.

Research output: Contribution to journalArticleResearchpeer-review

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