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- Australian Astronomical ObservatoryAU873 papers
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27 papers · 2 filters
The Chandra Planetary Nebulae Survey (ChanPlaNS): III. X-ray Emission from the Central Stars of Planetary Nebulae
R. Montez, J. H. Kastner, B. Balick +25
We present X-ray spectral analysis of 20 point-like X-ray sources detected in Chandra Planetary Nebula Survey (ChanPlaNS) observations of 59 planetary nebulae (PNe) in the solar ne…
Kinematical Properties of Planetary Nebulae with WR-type Nuclei
Ashkbiz Danehkar, Wolfgang Steffen, Quentin A. Parker
We have carried out integral field unit (IFU) spectroscopy of H, [N II] and [O III] emission lines for a sample of Galactic planetary nebulae (PNe) with Wolf-Rayet (WR) stars an…
Discovery of ZZ Cetis in detached white dwarf plus main-sequence binaries
S. Pyrzas, B. T. Gaensicke, J. J. Hermes +12
We present the first results of a dedicated search for pulsating white dwarfs (WDs) in detached white dwarf plus main-sequence binaries. Candidate systems were selected from a cata…
HST-Scale 3D simulations of MHD disc winds : A rotating two-component jet structure
Jan Staff, Nico Koning, Rachid Ouyed +2
We present the results of large scale, three-dimensional magneto-hydrodynamics simulations of disc-winds for different initial magnetic field configurations. The jets are followed…
Physical and Chemical Properties of Planetary Nebulae with WR-type Nuclei
Ashkbiz Danehkar, Roger Wesson, Amanda Karakas +1
We have carried out optical spectroscopic measurements of emission lines for a sample of Galactic planetary nebulae with Wolf-Rayet (WR) stars and weak emission-line stars (wels).…
The Na-O anticorrelation in horizontal branch stars. V. NGC 6723
R. G. Gratton, S. Lucatello, A. Sollima +7
We used FLAMES+GIRAFFE (Medusa mode) at the VLT to obtain moderately high resolution spectra for 30 red horizontal branch (RHB) stars, 4 RR Lyrae variables, and 17 blue horizontal…