ISO/SWS observations of the extended atmospheres and their time variations

Details ISO/SWS observations of the extended atmospheres and their time variations ISO/SWS observations of the extended atmospheres and their time variations

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283..173y&link_type=abstract

In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M

Astronomy and Astrophysics

Astrophysics

Stars: Agb And Post-Agb, Stars: Atmospheres, Stars: Late-Type, Infrared: Stars

Scientific paper

The Infrared Space Observatory (ISO) has greatly extended our scope of evolved stars. Data in the wavelength region inaccessible from the ground unveil new aspects of the objects. Here we review the studies of time variations of molecular bands in the near- and mid-infrared spectra of oxygen-rich stars oberved by the Short-Wavelength Spectrometer (SWS). These molecular bands are thought to arise in the extended region of the atmosphere and the inner part of the circumstellar envelope. It is seen that there are two regions in the extended atmosphere; one follows the optical variability and the other does not. We argue that pulsation shocks running through the atmosphere play an essential role on the variations.

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