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Circumstellar shells of Long–Period Variables

from Part four - Asymptotic Giant Branch stars

Published online by Cambridge University Press:  07 September 2010

A. Gauger
Affiliation:
Institut für Astronomie und Astrophysik, Technische Universität Berlin
A. J. Fleischer
Affiliation:
Institut für Astronomie und Astrophysik, Technische Universität Berlin
J. M. Winters
Affiliation:
Institut für Astronomie und Astrophysik, Technische Universität Berlin
E. Sedlmayr
Affiliation:
Institut für Astronomie und Astrophysik, Technische Universität Berlin
R. E. S. Clegg
Affiliation:
Royal Greenwich Observatory, Cambridge
I. R. Stevens
Affiliation:
Imperial College of Science, Technology and Medicine, London
W. P. S. Meikle
Affiliation:
University of Birmingham
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Summary

Introduction

Most long-period variables (LPVs) are surrounded by extended dusty circumstellar shells accompanied by considerable mass loss, which is often large enough to influence their evolution and to provide substantial amounts of chemically processed material to the ISM (Lafon & Berruyer 1991). Due to the improved instrumental capabilities at infrared and longer wavelengths a large amount of observational data is available for these objects (for a review see Habing 1990). On the other hand based on the progress in theoretical dynamical modelling of LPV atmospheres achieved during the last years (e.g. Bowen 1988, Fleischer et al. 1992) a detailed comparison of theory and observations seems to become accessible now.

The modelling method

Dynamical model calculations

Our approach for the dynamical modelling of circumstellar dust shells of LPVs, which is described in detail in Fleischer et al. 1992, comprises the explicit solution of the hydro-equations in spherical symmetry adopting Lagrangian coordinates, the treatment of radiative transfer by the Eddington approximation for a spherical grey atmosphere according to Lucy (1976), the description of postshock cooling of the gas either by limiting cases (e.g. isothermal shocks) or by cooling functions, and the consistent detailed treatment of the formation, growth and destruction of carbon grains by means of a moment method (cf. Gauger et al. 1990).

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Publisher: Cambridge University Press
Print publication year: 1994

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  • Circumstellar shells of Long–Period Variables
    • By A. Gauger, Institut für Astronomie und Astrophysik, Technische Universität Berlin, A. J. Fleischer, Institut für Astronomie und Astrophysik, Technische Universität Berlin, J. M. Winters, Institut für Astronomie und Astrophysik, Technische Universität Berlin, E. Sedlmayr, Institut für Astronomie und Astrophysik, Technische Universität Berlin
  • Edited by R. E. S. Clegg, Royal Greenwich Observatory, Cambridge, I. R. Stevens, Imperial College of Science, Technology and Medicine, London, W. P. S. Meikle, University of Birmingham
  • Book: Circumstellar Media in Late Stages of Stellar Evolution
  • Online publication: 07 September 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564628.033
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  • Circumstellar shells of Long–Period Variables
    • By A. Gauger, Institut für Astronomie und Astrophysik, Technische Universität Berlin, A. J. Fleischer, Institut für Astronomie und Astrophysik, Technische Universität Berlin, J. M. Winters, Institut für Astronomie und Astrophysik, Technische Universität Berlin, E. Sedlmayr, Institut für Astronomie und Astrophysik, Technische Universität Berlin
  • Edited by R. E. S. Clegg, Royal Greenwich Observatory, Cambridge, I. R. Stevens, Imperial College of Science, Technology and Medicine, London, W. P. S. Meikle, University of Birmingham
  • Book: Circumstellar Media in Late Stages of Stellar Evolution
  • Online publication: 07 September 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564628.033
Available formats
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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Circumstellar shells of Long–Period Variables
    • By A. Gauger, Institut für Astronomie und Astrophysik, Technische Universität Berlin, A. J. Fleischer, Institut für Astronomie und Astrophysik, Technische Universität Berlin, J. M. Winters, Institut für Astronomie und Astrophysik, Technische Universität Berlin, E. Sedlmayr, Institut für Astronomie und Astrophysik, Technische Universität Berlin
  • Edited by R. E. S. Clegg, Royal Greenwich Observatory, Cambridge, I. R. Stevens, Imperial College of Science, Technology and Medicine, London, W. P. S. Meikle, University of Birmingham
  • Book: Circumstellar Media in Late Stages of Stellar Evolution
  • Online publication: 07 September 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564628.033
Available formats
×