Abstract
The possible formation of iron-magnesium-oxides in stellar outflows from cool stars with oxygen rich element mixture is discussed. Chemical equilibrium calculations for the non-ideal solid solution magnesiowustite with composition Mg x Fe 1 - x - Φ O show that this oxide may be formed under conditions of imperfect equilibrium condensation. A model is developed for calculating the condensation of magnesiowustite under non equilibrium conditions in stellar outflows and numerical models for multi-component dust condensation including magnesiowustite in oxygen rich stellar outflows from cool stars are calculated. It is found that magnesiowustite should be formed in small but probably detectable quantities in outflows from oxygen rich AGB-stars with mass-loss rates M ≤ 4 x 10 - 6 M O . yr - It forms a feature in the spectrum which seems to correspond to a not yet identified feature seen in some circumstellar dust shells. For higher mass-loss rates condensation of magnesiowustite is suppressed by early massive condensation of silicates.
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