Abstract
The analysis of spectroscopic and pulsational properties of the PG 1159 stars is reviewed. Detailed NLTE model atmosphere analyses have shown that the PG 1159 stars are extremely hot, hydrogen deficient pre-white dwarfs. Generally, the atmospheres are dominated by carbon and helium with a significant amount of oxygen being present, too. These abundances indicate that the stars are exhibiting deep intershell layers which have been layed bare by strong [post-] AGB mass loss events. The abundance pattern is in concordance with the idea that the non-radial g-mode pulsations which are exhibited by about half of the objects are driven by cyclic ionisation of carbon and oxygen.
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Werner, K. (1992). Analysis of PG 1159 stars. In: Heber, U., Jeffery, C.S. (eds) The Atmospheres of Early-Type Stars. Lecture Notes in Physics, vol 401. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-55256-1_321
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DOI: https://doi.org/10.1007/3-540-55256-1_321
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