EAS Publications Series
Volume 4, 2002Infrared and Submillimeter Space Astronomy: An International Colloquium to Honor the Memory of Guy Serra
|Page(s)||339 - 339|
|Published online||25 September 2002|
M. Giard, J.P. Bernard, A. Klotz and I. Ristorcelli (eds)
EAS Publications Series, 4 (2002) 339
Variations of IR Spectra in carbon Mira, T Dra
Astronomy Program, School of Earth and Environmental Sciences,
Seoul National University, Seoul 151-742, Korea
We have studied variations of physical parameters in the circumstellar envelope of carbon-rich Mira variable, T Dra, at different pulsation phases. After comparing the ISO/SWS spectra of T Dra with spectral energy distributions (SEDs) calculated in models, we could find the best fitted parameters for the physical state of the dust envelope at each phase. The variations of parameters, effective temperature, fraction of SiC grains, mass loss rates and inner radius of shell are found to have nearly the same trend as that of light curve. The other parameters, grain size, optical depth, radius of central star and dust temperature at the inner boundary of envelope, are inversely varing to the light curve. We have found that most physical parameters vary within factor 2, while mass loss rate varies more than factor 3 during pulsation period.
© EAS, EDP Sciences, 2002
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