Results 81 to 90 of about 207,371 (176)
Stellar evolution from AGB to planetary nebulae [PDF]
, 2008 Planetary nebulae are formed by an interacting winds process where the remnant of the AGB wind is compressed and accelerated by a later-developed fast wind from the central star.
Kwok, S
core +1 more source
Detection of CH in the O-rich Planetary Nebula NGC 6302
The Astrophysical JournalPlanetary nebulae are sites where ejected stellar material evolves into complex molecules, but the precise physical conditions and chemical routes that govern these processes are unclear.
Charmi Bhatt +35 more
doaj +1 more source
On the Origin of Morphological Structures of Planetary Nebulae
Galaxies, 2018 We suggest that most of the mass in planetary nebulae (PNe) resides in the equatorial region and the spherical envelope and the optically bright lobes of PNe are in fact low-density cavities cleared out by fast outflows and photoionized by UV photons ...
Sun Kwok
doaj +1 more source
Automatic Derivation of Statistical Data Analysis Algorithms: Planetary Nebulae and Beyond
, 2004 AUTOBAYES is a fully automatic program synthesis system for the data analysis domain. Its input is a declarative problem description in form of a statistical model; its output is documented and optimized C/C++ code.
Schumann, Johann +3 more
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Discovering Planetary Nebula Geometries: Explorations with a Hierarchy of Models
, 2004 Astronomical objects known as planetary nebulae (PNe) consist of a shell of gas expelled by an aging star. In cases where the gas shell can be assumed to be ellipsoidal, the PN can be easily modeled in three spatial dimensions.
Knuth, Kevin H. +5 more
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Morphological structures of planetary nebulae [PDF]
, 2010 Since various structural components of planetary nebulae (PN) manifest themselves differently, a combination of optical, infrared, submillimetre and radio techniques is needed to derive a complete picture of planetary nebulae.
Kwok, S
core +1 more source
Radial velocities of planetary nebulae towards the Galactic bulge
, 1997 Accurate radial velocities for a sample of 71 planetary nebulae, mostly located in the direction of the Galactic Centre, are presented. Most of the nebulae discussed in this paper are likely members of the Galactic bulge, based on their radial velocity ...
A. A. Zijlstra, J. R. Walsh, A. Acker
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GalaxiesWe present a brief review of the formation and evolution of hydrogen-deficient central stars of planetary nebulae. We include a detailed description of the main observable features of both the central stars and their surrounding nebulae and review their ...
Marcelo M. Miller Bertolami
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The 3D structure of the Ring nebula
, 2009 The Ring nebula (M57) is one of the closest and best observed planetary nebulae. Still, its structure remains controversial. Based on detailed spectroscopic observations of the kinematics we present a solution generated with SHAPE to the 3D structure of ...
Steffen, W +6 more
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Absolute spectrophotometry of northern compact planetary nebulae
, 2005 We present medium-dispersion spectra and narrowband images of six northern compact planetary nebulae (PNe): BoBn
M. Perinotto +2 more
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