Carbon molecules in the inner wind of the oxygen-rich Mira IK Tauri

Details Carbon molecules in the inner wind of the oxygen-rich Mira IK Tauri Carbon molecules in the inner wind of the oxygen-rich Mira IK Tauri

1998-11-17

arxiv.org/abs/astro-ph/9811263v1

Astronomy and Astrophysics

Astrophysics

4 pages (accepted for publication in A&A Letters)

Scientific paper

The gas-phase non-equilibrium chemistry of the inner wind of the oxygen-rich Mira variable IK Tau (NML Tau) is investigated using a physio-chemical model describing the periodically shocked gas close to the stellar photosphere. We predict the formation in large amounts of a few carbon species in the inner envelope, in particular CO$_2$, which has been recently detected with ISO in the spectra of several oxygen-rich semi-regular and Mira stars. The theoretical abundances are also in excellent agreement with values derived from millimeter and sub-millimeter observations, pointing to the fact that some carbon species in oxygen stars do form from shock chemistry in the inner layers and travel the envelope as ``parent'' species.

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