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ISO/SWS Observations of the Extended Atmospheres and their Time Variations

  • Issei Yamamura
Part of the Astrophysics and Space Science Library book series (ASSL, volume 283)

Abstract

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 observed 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

Keywords

Stars AGB and post-AGB — Stars atmospheres — Stars late-type -Infrared stars 

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Copyright information

© Springer Science+Business Media Dordrecht 2003

Authors and Affiliations

  • Issei Yamamura
    • 1
  1. 1.The Institute of Space and Astronautical ScienceSagamiharaJapan

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