Properties of atmospheres and winds of H-deficient central stars and related objects

Details Properties of atmospheres and winds of H-deficient central stars and related objects Properties of atmospheres and winds of H-deficient central stars and related objects

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap%26ss.275...27w&link_type=abstract

Astrophysics and Space Science, v. 275, Issue 1/2, p. 27-39 (2001).

Astronomy and Astrophysics

Astrophysics

32

Scientific paper

According to latest results presented at this workshop, it appears that the surface chemistry of hydrogen-deficient post-AGB stars can now be explained by evolutionary calculations involving a late He-shell flash. A quantitative comparison of theoretical predictions with observed element abundances can eventually constrain details of this evolutionary scenario. I will emphasize here the diverse chemical compositions observed in H-deficient post-AGB stars, which call for an explanation. The abundance patterns vary from almost pure helium atmospheres to hydrogen- and helium-free atmospheres, with a rich choice of compositions in between, involving rather different mixtures of H, He, and CNO.

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