Survey of planetary nebulae at 30 GHz with OCRA-p
نویسندگان
چکیده
منابع مشابه
A CO Survey of Young Planetary Nebulae
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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We present results from an ongoing survey of the infrared emission lines [Kr III] 2.199 and [Se IV] 2.287 μm in Galactic planetary nebulae (PNe). Krypton and selenium may be produced by slow neutron-capture nucleosynthesis (the “s-process”) during the asymptotic giant branch (AGB) phase of PN progenitor stars, and brought to the surface by convective dredge-up before PN ejection. We detect emis...
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Planetary nebulae (PNe) are known to possess a variety of small-scale structures that are usually in a lower ionization state than the main body of the nebulae. The morphological and kinematic properties of these low-ionization structures (LISs) vary from type to type in the sense that LISs can appear in the form of pairs of knots, filaments, jets, and isolated features moving with velocities t...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2009
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/200811369