Add to ORKGThe impact of knowledge of H II regions, planetary nebulae and supernova remnants due to International Ultraviolet Explorer is examined. The more relevant aspects related to the physical conditions of gaseous nebulae are reviewed. The following properties of gaseous nebulae are discussed: (1) density and temperature distribution; (2) ionization structure; (3) chemical composition; (4) internal dust; and (5) shock velocity for supernova remnants. The CNO abundances of planetary nebulae are compared with stellar evolution models
We present new low-resolution (R ~ 800) optical spectra of 22 Galactic planetary nebulae (...
Planetary nebulae contain shells of cold gas and dust whose heating and chemistry is likely driven b...
The role of planetary nebulae as probes for the galactic chemical evolution is reviewed. Their abund...
We present observations of the infrared fine-structure lines of [Si II] (34.8 mum), [O I] (63.2 and ...
We present observations of the infrared fine-structure lines of $\ion{[Si}{ii}$] (34.8 μm), $\ion{...
Planetary nebulae (PNe) are the glowing, gaseous remnants of low to intermediate mass stars. As ligh...
The current status of observations of planetary nebulae and their central stars is presented. Partic...
Planetary nebulae constitute the near-end stages of low-to-intermediate-mass stars, when their eject...
Research basically has been directed along two avenues. First of all, there is a long-standing inter...
The properties of bright extragalactic planetary nebulae are reviewed based upon the results of low ...
We have obtained deep optical spectra of medium resolution for a sample of 12 Galactic planetary neb...
Additional evidence for the existence of interstellar grains in H II regions is presented from obser...
The low temperatures and densities in the extended outer layers of asymptotic giant branch (AGB) sta...
We present medium-resolution (R~700) near-infrared (lambda = 1 - 2.5 micron) spectra of a sample of ...
A summary is given of planetary nebulae abundances from ISO measurements. It is shown that these neb...
We present new low-resolution (R ~ 800) optical spectra of 22 Galactic planetary nebulae (...
Planetary nebulae contain shells of cold gas and dust whose heating and chemistry is likely driven b...
The role of planetary nebulae as probes for the galactic chemical evolution is reviewed. Their abund...
We present observations of the infrared fine-structure lines of [Si II] (34.8 mum), [O I] (63.2 and ...
We present observations of the infrared fine-structure lines of $\ion{[Si}{ii}$] (34.8 μm), $\ion{...
Planetary nebulae (PNe) are the glowing, gaseous remnants of low to intermediate mass stars. As ligh...
The current status of observations of planetary nebulae and their central stars is presented. Partic...
Planetary nebulae constitute the near-end stages of low-to-intermediate-mass stars, when their eject...
Research basically has been directed along two avenues. First of all, there is a long-standing inter...
The properties of bright extragalactic planetary nebulae are reviewed based upon the results of low ...
We have obtained deep optical spectra of medium resolution for a sample of 12 Galactic planetary neb...
Additional evidence for the existence of interstellar grains in H II regions is presented from obser...
The low temperatures and densities in the extended outer layers of asymptotic giant branch (AGB) sta...
We present medium-resolution (R~700) near-infrared (lambda = 1 - 2.5 micron) spectra of a sample of ...
A summary is given of planetary nebulae abundances from ISO measurements. It is shown that these neb...
We present new low-resolution (R ~ 800) optical spectra of 22 Galactic planetary nebulae (...
Planetary nebulae contain shells of cold gas and dust whose heating and chemistry is likely driven b...
The role of planetary nebulae as probes for the galactic chemical evolution is reviewed. Their abund...