The Effect of Stellar Pulsation Cycles on Dust Formation: A Temporal Study of the Mid-infrared Spectrum of O-rich AGB Star, T Cep.

Details The Effect of Stellar Pulsation Cycles on Dust Formation: A Temporal Study of the Mid-infrared Spectrum of O-rich AGB Star, T Cep. The Effect of Stellar Pulsation Cycles on Dust Formation: A Temporal Study of the Mid-infrared Spectrum of O-rich AGB Star, T Cep.

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21440202g&link_type=abstract

American Astronomical Society, AAS Meeting #214, #402.02; Bulletin of the American Astronomical Society, Vol. 41, p.662

Astronomy and Astrophysics

Astronomy

Scientific paper

Dust formation around oxygen-rich AGB stars is believed to be driven by pulsation of the star. T Cep, a long-period Mira, was observed by ISO using SWS seven times in a 16 month period, providing a great opportunity to test theories that link pulsation, stellar variability and dust formation. We present analyses of these spectra which show how the spectral dust features change over the variability cycle of this Mira and compare the results with competing dust formation hypotheses. In general, the overall apparent changes in spectral feature strengths can be attributed to changes in the underlying dust continuum temperature, resulting from the intrinsic variability of the central star. However, not all feature changes are so easily explained. In particular, the classic interpretation of the broad complex of features cannot be attributed to a simple mixture of alumina and glassy silicate.The peak features at 9.7, 10.8, 11.3, 13.1 micron are better explained by crystalline silicate or mixtures of crystalline silicate and alumina. We interpret these results in terms of the effect of the star's variability on dust formation and processing.

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