Evolution from AGB Star to Planetary Nebula
نویسندگان
چکیده
منابع مشابه
Evolution from AGB to planetary nebula in the MSX survey ⋆ ⋆ ⋆
We investigate the evolution of oxygen-and carbon-rich AGB stars, post-AGB objects, and planetary nebulae using data collected mainly from the MSX catalogue. Magnitudes and colour indices are compared with those calculated from a grid of synthetic spectra that describe the post-AGB evolution beginning at the onset of the superwind. We find that carbon stars and OH/IR objects form two distinct s...
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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. One-dimensional dynamical models have successfully explained the multi-shell (bubble, shell, crown, haloes) structures and the kinematics of planetary nebulae. However, the origin of the diverse asymmetric morphology o...
متن کاملThe nebula around the post - AGB star 89 Her ⋆
Aims. We aim to study the structure of the nebula around the post-AGB, binary star 89 Her. The presence of a rotating disk around this star had been proposed but not been yet confirmed by observations. Methods. We present high-resolution PdBI maps of CO J=2–1 and 1–0. Properties of the nebula are directly derived from the data and model fitting. We also present N-band interferometric data on th...
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The common envelope interaction is responsible for evolved close binaries. Among them are a minority of central stars of planetary nebula (PN). Recent observational results, however, point to most PN actually being in binary systems. We therefore ask the question if it is feasible that most, or even all Galactic PN derive from a common envelope interaction. Our recent calculation finds that if ...
متن کاملHigh-Resolution Imaging of Objects in the Post-AGB to Planetary Nebula Transition
We have obtained high-resolution images of two carbon-rich objects that are undergoing the transition from post-AGB star to planetary nebula: IRAS 21282+5050 (hereafter IRAS 21282), a young planetary nebula, and AFGL 3068, a post-AGB star with a high mass-loss rate. Detailed structure is seen in IRAS 21282. A torus of dust, with its polar axis in the N-S direction, surrounds the central star, i...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of the Pacific
سال: 1993
ISSN: 0004-6280,1538-3873
DOI: 10.1086/133236