Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.396w&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
Carbon stars with high mass-loss rates in the Large Magellanic Cloud have recently been subject of renewed interest through their compelling Spitzer IRS spectra. These dusty evolved objects must have a thick molecular envelope, and the capabilities of the ALMA interferometer mean that we will be able to observe the molecular content of these stars in a reasonable amount of time. I will talk about my work that investigates the rich chemistry in the circumstellar envelopes of these low-metallicity objects, which is very different to that of Galactic carbon stars. For a given mass-loss rate and wind expansion velocity, penetration of UV radiation into the envelope is greater, meaning that the molecular envelope is smaller, and that the chemistry is warmer. The CO molecule is not as dominant as it is in Galactic stars, and acetylene becomes more abundant at certain radii. In general, chemistry is more complex, with larger hydrocarbons and cyanopolyynes reaching abundances comparable to those of smaller members of the same family. It is clear that one cannot simply scale Galactic carbon-rich circumstellar abundances to according to metallicity.
Kemper Ciska
Walsh Catherine
Woods Paul
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