Bibcode
Dell'Agli, F.; Di Criscienzo, M.; García-Hernández, D. A.; Ventura, P.; Limongi, M.; Marini, E.; Jones, O. C.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 482, Issue 4, p.4733-4743
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2
2019
Citations
15
Refereed citations
13
Description
We study the evolved stellar population of the galaxy Sextans A. This
galaxy is one of the lowest metallicity dwarfs in which variable
asymptotic giant branch stars have been detected, suggesting that little
metal enrichment took place during the past history. The analysis
consists in the characterization of a sample of evolved stars, based on
evolutionary tracks of asymptotic giant branch and red supergiant stars,
which include the description of dust formation in their winds. Use of
mid-infrared and near-infrared data allowed us to identify carbon-rich
sources, stars undergoing hot bottom burning, and red supergiants. The
dust production rate, estimated as 6 ×
10-7M⊙/yr, is dominated by ˜10 carbon
stars, with a small contribution of higher mass M-stars, of the order of
4 × 10-8M⊙/yr. The importance of this
study to understand how dust production works in metal-poor environments
is also evaluated.
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