Bibcode
Dell'Agli, F.; García-Hernández, D. A.; Schneider, R.; Ventura, P.; La Franca, F.; Valiante, R.; Marini, E.; Di Criscienzo, M.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 467, Issue 4, p.4431-4440
Advertised on:
6
2017
Citations
45
Refereed citations
40
Description
We present dust yields for asymptotic giant branch (AGB) and
super-asymptotic giant branch (SAGB) stars of solar metallicity. Stars
with initial mass 1.5 M⊙ ≤ Mini ≤ 3
M⊙ reach the carbon star stage during the AGB phase and
produce mainly solid carbon and SiC. The size and the amount of the
carbon particles formed follows a positive trend with the mass of the
star; the carbon grains with the largest size (aC ∼ 0.2
μm) are produced by AGB stars with Mini = 2.5-3
M⊙, as these stars are those achieving the greatest
enrichment of carbon in the surface regions. The size of SiC grains,
being sensitive to the surface silicon abundance, remains at about
aSiC ∼ 0.1μm. The mass of carbonaceous dust formed is
in the range 10-4-5 × 10-3
M⊙, whereas the mass of SiC produced is 2 ×
10-4-10-3 M⊙. Massive AGB/SAGB
stars with Mini > 3 M⊙ experience hot
bottom burning, which inhibits the formation of carbon stars. The most
relevant dust species formed in these stars are silicate and alumina
dust, with grain sizes in the range 0.1 < aol < 0.15
μm and a_Al_2O_3 ˜ 0.07 μm, respectively. The mass of
silicates produced spans the interval 3.4 × 10-3
M⊙ ≤ Mdust ≤ 1.1 × 10-2
M⊙ and increases with the initial mass of the star.
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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
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García Hernández