Molecular line mapping of (young) planetary nebulae
نویسندگان
چکیده
منابع مشابه
Molecular Line Observations of Proto-planetary Nebulae
We present our recent results on mm-wave CO observations of proto-planetary nebulae. These include high-resolution interferometric maps of various CO lines in three well known bipolar PPNe: M 1–92, M 2–56 and OH 231.8+4.2. The global properties of the high velocity molecular emission in post-AGB sources have been also studied, by means of high-sensitivity single dish observations of the J=1–0 a...
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The distributions of H2 1-0 S(l) emission in the young planetary nebulae BD +30°3639 and NGC 7027 show ~triking similarities: both have limb-brightened arcs of H2 emission with radii that are about twice those of ~h~ir H; II regions. The extended H2 emission in both nebulae is attributed to a photodissociation region. Thi.s implies that the neutral envelopes of these young planetaries extend we...
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We report the results of a sensitive survey of young planetary nebulae in the CO J = 2− 1 line that significantly increases the available data on warm, dense, molecular gas in the early phases of planetary nebula formation. The observations were made using the IRAM 30 m telescope with the 3×3 pixel Heterodyne Receiver Array (HERA). The array provides an effective means of discriminating the CO ...
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Aims. We aim to study the physical conditions, particularly the excitation state, of the intermediate-temperature gas in protoplanetary nebulae and young planetary nebulae (PPNe, PNe). The information that the observations of the different components deliver is of particular importance for understanding the evolution of these objects. Methods. We performed Herschel/HIFI observations of intermed...
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Despite numerous efforts, the transition from Asymptotic Giant Branch (AGB) stars to Planetary Nebulae (PN) is a poorly understood phase of stellar evolution. We have therefore carried out interferometric (VLA) radio observations of a sample of hot post-AGB stars, selected on the basis of their optical and infrared properties. Ten sources out of the 16 observed were detected. This indicates tha...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2016
ISSN: 1742-6588,1742-6596
DOI: 10.1088/1742-6596/728/3/032010