Bibcode
Dell'Agli, F.; Valiante, R.; Kamath, D.; Ventura, P.; García-Hernández, D. A.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 4, p.4738-4752
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7
2019
Citations
17
Refereed citations
15
Description
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 ˜2.5
M⊙. Stars of mass M < 2.5 M⊙ 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.
Related projects
Nucleosynthesis and molecular processes in the late stages of Stellar Evolution
Low- to intermediate-mass (M < 8 solar masses, Ms) stars represent the majority of stars in the Cosmos. They finish their lives on the Asymptotic Giant Branch (AGB) - just before they form planetary nebulae (PNe) - where they experience complex nucleosynthetic and molecular processes. AGB stars are important contributors to the enrichment of the
Domingo Aníbal
García Hernández