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Published April 21, 2006 | Published + Accepted Version
Journal Article Open

Observable effects of dust formation in dynamic atmospheres of M-type Mira variables

Abstract

The formation of dust with temperature-dependent non-grey opacity is considered in a series of self-consistent model atmospheres at different phases of an O-rich Mira variable of mass 1.2 M_⊙. Photometric and interferometric properties of these models are predicted under different physical assumptions regarding the dust formation. The iron content of the initial silicate that forms and the availability of grain nuclei are found to be critical parameters that affect the observable properties. For certain plausible parameter values, dust would form at 2–3 times the average continuum photospheric radius. This work provides a consistent physical explanation for the larger apparent size of Mira variables at wavelengths shorter than 1 μm than that predicted by dust-free fundamental-mode pulsation models.

Additional Information

© 2006 The Authors. Journal compilation © 2006 RAS, MNRAS. Accepted 2006 January 9. Received 2006 January 2; in original form 2005 August 9. This research was supported by the Australian Research Council and the Deutsche Forschungsgemeinschaft within the linkage project 'Red Giants' and by a grant of the Deutsche Forschungsgemeinschaft on 'Time Dependence of Mira Atmospheres'.We would like to thank P. G. Tuthill and the referee P. Woitke for valuable comments on the manuscript and H. P. Gail for answering many questions about dust formation theory.

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Published - IREmnras06.pdf

Accepted Version - 0601383.pdf

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Created:
August 22, 2023
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October 23, 2023