The systematics and distribution of molecular hydrogen in planetary nebulae
نویسندگان
چکیده
منابع مشابه
Hydrogen-poor planetary nebulae
Five planetary nebulae are known to show hydrogen-poor material near the central star. In the case of A58, this gas was ejected following a late thermal pulse similar to Sakurai. In this paper I will review these five objects. One of them, IRAS 18333−2357, may not be a true PN. I will show that there is a strong case for a relation to the [WC] stars and their relatives, the weak emission-line s...
متن کاملKinematics of Molecular Hydrogen Emission from Planetary and Pre-planetary Nebulae
We report results from a program of high-resolution spectral mapping of rotational H2 emission from bipolar planetary and pre-planetary nebulae. Long-slit spectra obtained with the NOAO Phoenix near-infrared spectrometer allow us to probe the molecular kinematics of these nebulae at moderate spatial resolution. We find strong evidence of a component of rotation in the equatorial H2 emission fro...
متن کاملDiscovery of Lyα Pumped Molecular Hydrogen Emission in the Planetary Nebulae
We report the first observation of Lyα pumped molecular hydrogen emission lines in planetary nebulae. The H2 emission observed in the ultraviolet spectra of NGC 6853 and NGC 3132 can be explained by excitation of vibrationally hot H2 by Lyα photons. Constraints are placed on the nebular Lyα emission profile, as well as the molecular hydrogen temperature, column density and turbulent motion. The...
متن کاملMolecular 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...
متن کاملThe Spatial Distribution of Cool Dust in Planetary Nebulae
We have observed a sample of eleven PNe using the PHT-C100 camera on ISO, obtaining maps at 60 and 100 m. The PHT-32 mapping mode was used, resulting in images of the PNe and nearby sky background. A preliminary reduction of the data has conrmed that the radial extent of the cool dust in general is similar to the optical nebula. Two of the PN in our sample have been clearly resolved at 60 and 1...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1988
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/235.2.533