57 citations · 274 across the 14 of their papers we have counts for
14 papers
Hot bubbles of planetary nebulae with hydrogen-deficient winds. III. Formation and evolution in comparison with hydrogen-rich bubbles
D. Schönberner, M. Steffen
We seek to understand the evolution of Wolf-Rayet central stars by comparing the diffuse X-ray emission from their wind-blown bubbles with that from their hydrogen-rich counterpart…
Analysis of the X-ray spectrum of the hot bubble of BD+30°3639
Detlef Schönberner, Ralf Jacob, René Heller +1
We developed a model for wind-blown bubbles with temperature and density profiles based on self-similar solutions including thermal conduction. We constructed also heat-conduction…
Hot bubbles of planetary nebulae with hydrogen-deficient winds I. Heat conduction in a chemically stratified plasma
Christer Sandin, Matthias Steffen, Detlef Schönberner +1
Heat conduction has been found a plausible solution to explain discrepancies between expected and measured temperatures in hot bubbles of planetary nebulae (PNe). While the heat co…
The born-again planetary nebula A78: an X-ray twin of A30
J. A. Toalá, M. A. Guerrero, H. Todt +8
We present the XMM-Newton discovery of X-ray emission from the planetary nebula (PN) A78, the second born-again PN detected in X-rays apart from A30. These two PNe share similar sp…
Weak magnetic fields in central stars of planetary nebulae?
M. Steffen, S. Hubrig, H. Todt +4
It is not yet clear whether magnetic fields play an essential role in shaping planetary nebulae (PNe), or whether stellar rotation alone and/or a close binary companion can account…
The Chandra Planetary Nebula Survey (ChanPlaNS). II. X-ray Emission from Compact Planetary Nebulae
M. Freeman, R. Montez, J. H. Kastner +24
We present results from the most recent set of observations obtained as part of the Chandra X-ray observatory Planetary Nebula Survey (ChanPlaNS), the first comprehensive X-ray sur…
The evolution of planetary nebulae. VIII. True expansion rates and visibility times
R. Jacob, D. Schoenberner, M. Steffen
The visibility time of planetary nebulae (PNe) in stellar systems is an essential quantity for estimating the size of a PN population in the context of general population studies.…
Diffuse X-ray Emission from Planetary Nebulae with Nebular O VI
N. Ruiz, Y. -H. Chu, R. A. Gruendl +4
The presence of O VI ions can be indicative of plasma temperatures of a few times 10^5 K that is expected in heat conduction layers between the hot shocked stellar wind gas at seve…
Rebirth of X-ray Emission from the Born-Again Planetary Nebula A 30
M. A. Guerrero, N. Ruiz, W. -R. Hamann +8
The planetary nebula (PN) A30 is believed to have undergone a very late thermal pulse resulting in the ejection of knots of hydrogen-poor material. Using HST images we have detecte…
Modeling the diffuse X-ray emission of Planetary Nebulae with different chemical composition
M. Steffen, C. Sandin, R. Jacob +1
Based on time-dependent radiation-hydrodynamics simulations of the evolution of Planetary Nebulae (PNe), we have carried out a systematic parameter study to address the non-trivial…
The evolution of planetary nebulae VII. Modelling planetary nebulae of distant stellar systems
D. Schönberner, R. Jacob, C. Sandin +1
By means of hydrodynamical models we do the first investigations of how the properties of planetary nebulae are affected by their metal content and what can be learned from spatial…
The evolution of planetary nebulae VI. On the chemical composition of the metal-poor PN G135.9+55.9
C. Sandin, R. Jacob, D. Schönberner +2
The actual value of the oxygen abundance of the metal-poor planetary nebula PN G135.9+55.9 has frequently been debated in the literature. We wanted to clarify the situation by maki…
Measuring The Mass Loss Evolution at The Tip of The Asymptotic Giant Branch
C. Sandin, M. M. Roth, D. Schönberner
In the final stages of stellar evolution low- to intermediate-mass stars lose their envelope in increasingly massive stellar winds. Such winds affect the interstellar medium and th…
3D-Spectroscopy of extragalactic planetary nebulae as diagnostic probes for galaxy evolution
Andreas Kelz, Ana Monreal-Ibero, Martin M. Roth +3
In addition to study extragalactic stellar populations in their integrated light, the detailed analysis of individual resolved objects has become feasible, mainly for luminous gian…