Add to ORKGFUSE spectroscopy has proved that extremely hot hydrogen-deficient post-AGB stars (PG1159 stars) display matter on their surface that usually remains hidden in the region between the H- and He-burning shells of the former AGB star. Hence, the spectral analysis of PG1159 stars allows to study directly the chemistry of this intershell region which is the outcome of complicated burning and mixing processes during AGB evolution. Detailed abundance determinations provide constraints for these processes which are still poorly understood. With FUSE we have discovered high neon and fluorine overabundances. There is also a significant iron deficiency, which may be caused by s-process neutron capture transforming iron into heavier elements
In this thesis we scrutinize and improve theoretical models of the two helium burning stages of low-...
The studies focused on the thermally pulsing asymptotic giant branch phase experienced by low- and i...
Context. Revised spectroscopic parameters for the HF molecule and a new CN line list in the 2.3 μm r...
The hydrogen-deficiency in extremely hot post-AGB stars of spectral class PG1159 is probably caused ...
We review the observed properties of extremely hot hydrogen-deficient post-AGB stars of spectral typ...
Context. Hot post-AGB stars are luminous objects of low- and intermediate mass (0.8–8 M⊙) in the fi...
We have discovered lines of highly ionized fluorine ($\ion{F}{v}$ and $\ion{F}{vi}$) in the far-UV s...
We present a first systematic investigation of the iron abundance in very hot (Teff K) hydrogen-defi...
Asymptotic giant branch (AGB) stars are initially low and intermediate mass stars undergoing recurre...
We performed detailed nucleosynthesis calculations in hydrogen and helium burning shells as well as ...
We investigate FUSE spectra of three PG1159 stars and do not find any evidence for iron lines. From ...
We have analyzed high resolution and high signal-to-noise spectra of about 20 metal-poor stars. The ...
We present new computations of the evolution of solar metallicity stars in the mass range $9 {-} 12...
The foundations of stellar nucleosynthesis have been established more than 70 years ago. Since then,...
Context. This paper is part of a larger project in which we systematically study the chemical abunda...
In this thesis we scrutinize and improve theoretical models of the two helium burning stages of low-...
The studies focused on the thermally pulsing asymptotic giant branch phase experienced by low- and i...
Context. Revised spectroscopic parameters for the HF molecule and a new CN line list in the 2.3 μm r...
The hydrogen-deficiency in extremely hot post-AGB stars of spectral class PG1159 is probably caused ...
We review the observed properties of extremely hot hydrogen-deficient post-AGB stars of spectral typ...
Context. Hot post-AGB stars are luminous objects of low- and intermediate mass (0.8–8 M⊙) in the fi...
We have discovered lines of highly ionized fluorine ($\ion{F}{v}$ and $\ion{F}{vi}$) in the far-UV s...
We present a first systematic investigation of the iron abundance in very hot (Teff K) hydrogen-defi...
Asymptotic giant branch (AGB) stars are initially low and intermediate mass stars undergoing recurre...
We performed detailed nucleosynthesis calculations in hydrogen and helium burning shells as well as ...
We investigate FUSE spectra of three PG1159 stars and do not find any evidence for iron lines. From ...
We have analyzed high resolution and high signal-to-noise spectra of about 20 metal-poor stars. The ...
We present new computations of the evolution of solar metallicity stars in the mass range $9 {-} 12...
The foundations of stellar nucleosynthesis have been established more than 70 years ago. Since then,...
Context. This paper is part of a larger project in which we systematically study the chemical abunda...
In this thesis we scrutinize and improve theoretical models of the two helium burning stages of low-...
The studies focused on the thermally pulsing asymptotic giant branch phase experienced by low- and i...
Context. Revised spectroscopic parameters for the HF molecule and a new CN line list in the 2.3 μm r...