We present far-UV to optical analyses of four hydrogen deficient central stars of planetary nebulae: BD+303639, NGC 40, NGC 5315 and NGC 6905. Using the radiative transfer code CMFGEN, we determined new physical parameters and chemical abundances for these stars. The results were analyzed in the context of the [WR] => PG 1159 evolution via the transformed radius(Rt)-temperature and HR diagrams. NGC 5315 showed itself as an odd object among the previously analyzed central stars. Its temperature (~76kK) is considerably lower than other early-type [WR] stars (~120-150kK). From our models for NGC 5315 and NGC 6905, it is unclear if early-type [WR] stars have smaller C/He mass ratios than other spectral classes, as claimed in the literature. A r...
Abstract. One of the strongest absorption lines observed in far-ultraviolet FUSE spectra of many PG ...
We observed five central stars of planetary nebulae (CSPN) in the Large Magellanic Cloud (LMC) and t...
PG 1159 stars are hot, hydrogen-deficient (pre-) white dwarfs with atmospheres mainly composed of he...
We analyze the far-UV/UV spectra of four central stars of planetary nebulae (CSPNs) with strong wind...
We analysed ultraviolet Far Ultraviolet Spectroscopic Explorer, International Ultraviolet\ud Explore...
"March 2011"Thesis (PhD) -- Macquarie University, Faculty of Science, Dept. of Physics and Astronomy...
Stellar post asymptotic giant branch (post-AGB) evolution can be completely altered by a final therm...
We analysed ultraviolet Far Ultraviolet Spectroscopic Explorer, International Ultraviolet Explorer, ...
In this paper, we present an LTE abundance analysis of two new proto-planetary nebulae, IRAS Z02229 ...
Bibliography: pages 387-442.Chapter 1. Introduction -- Part I. Planetary nebulae with [WC] stars -- ...
The goal of this project was to gain new insight into both the true temperatures of the central star...
This thesis presents a study of the kinematics, physical conditions and chemical abundances for a sa...
We review the observed properties of extremely hot hydrogen-deficient post-AGB stars of spectral typ...
PG1159-035 is the prototype of the PG1159 spectral class which consists of extremely hot hydrogen-de...
The evolution of central stars of planetary nebulae can proceed in several distinct ways, either lea...
Abstract. One of the strongest absorption lines observed in far-ultraviolet FUSE spectra of many PG ...
We observed five central stars of planetary nebulae (CSPN) in the Large Magellanic Cloud (LMC) and t...
PG 1159 stars are hot, hydrogen-deficient (pre-) white dwarfs with atmospheres mainly composed of he...
We analyze the far-UV/UV spectra of four central stars of planetary nebulae (CSPNs) with strong wind...
We analysed ultraviolet Far Ultraviolet Spectroscopic Explorer, International Ultraviolet\ud Explore...
"March 2011"Thesis (PhD) -- Macquarie University, Faculty of Science, Dept. of Physics and Astronomy...
Stellar post asymptotic giant branch (post-AGB) evolution can be completely altered by a final therm...
We analysed ultraviolet Far Ultraviolet Spectroscopic Explorer, International Ultraviolet Explorer, ...
In this paper, we present an LTE abundance analysis of two new proto-planetary nebulae, IRAS Z02229 ...
Bibliography: pages 387-442.Chapter 1. Introduction -- Part I. Planetary nebulae with [WC] stars -- ...
The goal of this project was to gain new insight into both the true temperatures of the central star...
This thesis presents a study of the kinematics, physical conditions and chemical abundances for a sa...
We review the observed properties of extremely hot hydrogen-deficient post-AGB stars of spectral typ...
PG1159-035 is the prototype of the PG1159 spectral class which consists of extremely hot hydrogen-de...
The evolution of central stars of planetary nebulae can proceed in several distinct ways, either lea...
Abstract. One of the strongest absorption lines observed in far-ultraviolet FUSE spectra of many PG ...
We observed five central stars of planetary nebulae (CSPN) in the Large Magellanic Cloud (LMC) and t...
PG 1159 stars are hot, hydrogen-deficient (pre-) white dwarfs with atmospheres mainly composed of he...