Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phdt........98a&link_type=abstract
PhD Thesis, Universidad Autonoma de Madrid, 2009
Astronomy and Astrophysics
Astrophysics
9
Molecular Astrophysics, Circumstellar Envelopes, Agb Stars, Objects: Irc +10216
Scientific paper
Stars experience during their last evolutionary stages the most drastic changes of all their lifes, the most spectacular is probably the huge increment in the dimensions of the star, which expands until reaching a radius of several astronomical units. Thus, low mass stars (< 8 solar masses) become red giants and start to suffer strong mass loss processes, which are particularly intense during the phase known as AGB (Asymptotic Giant Branch). The stellar winds associated to the AGB phase produce very extended circumstellar envelopes, composed of gas phase molecules and tiny solid dust particles, and are the main mechanism by means of which the interstellar medium is being recycled of matter. The gas in these circumstellar envelopes show a very rich variety of molecules, specially in the case of carbon-rich envelopes, i.e. those in which the dredge-up processes have brought carbon out to the surface in a selective way making the abundance ratio [C]/[O] higher than 1. In this thesis we present a study of the chemical composition and processes that occur in the circumstellar envelope of the prototype of carbon-rich AGB star, IRC +10216. The study of this object allow us to get insight in a very detailed manner into phenomena that are characteristic of carbon-rich circumstellar envelopes and that cannot be studied in other objects of the same type, which due to their larger distances to the Earth only show the most evident processes.
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