The sublimation temperature effect on the evolution of dust shells around AGB stars


Helvacı M.

ESO ASTROPHYSICS SYMPOSIA, Munchen, Germany, 18 - 21 October 2003, vol.1, no.1, pp.398-400

  • Publication Type: Conference Paper / Full Text
  • Volume: 1
  • City: Munchen
  • Country: Germany
  • Page Numbers: pp.398-400

Abstract

Evolution of AGB stars is still under heavy investigations. In this study, we have combined theoretical studies and observations. Comparing theoretical models and observations of oxygen rich AGB stars we have obtained a clear evidance that overall optical depth (T,) shows a strong correlation with ratio of 9.8 mu m and 18 gm band strenghts [9.8/18]. Correlation between the ratio [9.8/18] and (tau(v)) is not effected by stellar temperature and chemical composition of the shell, but inner boundry (sublimation) temperature of the shell plays a critical role on range of optical depth and stage of evolution of dust shell.