Stellar Pulsation and the Variability of Infrared Spectral Features

Details Stellar Pulsation and the Variability of Infrared Spectral Features Stellar Pulsation and the Variability of Infrared Spectral Features

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341203s&link_type=abstract

American Astronomical Society, AAS Meeting #213, #412.03; Bulletin of the American Astronomical Society, Vol. 41, p.217

Astronomy and Astrophysics

Astronomy

Scientific paper

Mass loss from AGB stars is believed to be driven by a combination of stellar pulsation and radiation pressure on dust grains. In turn, the formation of dust is expected to be intimately linked to pulsation. T Cep, a long-period oxygen-rich Mira, was observed spectroscopically seven times in a 16 month period using ISO SWS. This infrared spectroscopic data provides 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, there is an unidentified feature at 10.8 micron which cannot be explained so easily. We discuss the carrier of the 10.8 micron feature and interpret the temporal variability of the T Cep spectrum in terms of the effect of the star's variability on dust formation and processing.

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