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LMC PNe [OIII] 5007{AA} and H{beta} flux
Our previous identification and spectroscopic confirmation of 431 faint, new planetary nebulae (PNe) in the central 25deg^2^ region of the Large Magellanic Cloud (LMC) permit us... -
Chemical abundances for Hf 2-2
We present high-quality optical spectroscopic observations of the planetary nebula (PN) Hf 2-2. The spectrum exhibits many prominent optical recombination lines (ORLs) from... -
Planetary nebulae classification
I classify a large number of planetary nebulae (458) according to the process that caused their progenitors to blow axisymmetrical winds. The classification is based primarily... -
Planetary nebulae with LOFAR 120-168MHz obs.
We present observations of planetary nebulae with the LOw Frequency ARray (LOFAR) between 120 and 168MHz. The images show thermal free-free emission from the nebular shells. We... -
BVRI photometric obs. of the PNe NGC 6337 & Sp 1
A current issue in the study of planetary nebulae with close binary central stars (CSs) is the extent to which the binaries affect the shaping of the nebulae. Recent studies... -
NIR spectra of 10 PNe in LMC and SMC
We present near-infrared spectra of 10 planetary nebulae (PNe) in the Large and Small Magellanic Clouds (LMC and SMC), acquired with the FIRE and GNIRS spectrometers on the 6.5... -
Observations of HCO^+^ in NGC 7293
The J=1->0 transition of HCO^+^ at 89GHz has been mapped across the Helix Nebula (NGC 7293) with 70" spatial resolution (1.68km/s velocity resolution) using the Arizona Radio... -
{kappa}-distributed electrons and OIII em. line
The measurement of electron temperatures and metallicities in H II regions and planetary nebulae (PNe) has--for several decades--presented a problem: results obtained using... -
PNe in 5 nearby galaxies
As the second step in our investigation of the mass-to-light ratio of spiral disks, we present the results of a spectroscopic survey of planetary nebulae (PNe) in five nearby,... -
Radio evolution of the PN NGC 7027
We present the results of a 25yr program to monitor the radio flux evolution of the planetary nebula NGC 7027. We find significant evolution of the spectral flux densities. The... -
Catalog of planetary nebulae in NGC 3379
We present results from Planetary Nebula Spectrograph (PN.S) observations of the elliptical galaxy NGC 3379 and a description of the data reduction pipeline. We detected 214... -
M 104 planetary nebulae
We used the CTIO 4m telescope to make a complete and kinematically unbiased survey of M104 (NGC 4594; the Sombrero galaxy) for planetary nebulae (i.e., stars) out to 16 kpc. We... -
Planetary Nebula Kinematics in M31
We present kinematics of 135 planetary nebulae (PNs) in M31 from a survey covering 3.9{deg}^2^ and extending out to 15kpc from the southwest major axis and more than 20kpc along... -
Line intensities in the planetary nebula NGC 5307
Echelle spectrophotometry of the planetary nebula NGC 5307 is presented. The data consist of Very Large Telescope Ultraviolet Visual Echelle Spectrograph observations in the... -
M51 Planetary Nebula Candidates
We report the results of a radial velocity survey of planetary nebulae (PNe) located in the tidal features of the well-known interacting system NGC 5194/95 (M51). We find clear... -
PNe in six galaxies
We report the results of [O III] {lambda}5007 surveys for planetary nebulae (PNe) in six galaxies: NGC 2403, NGC 3115, NGC 3351, NGC 3627, NGC 4258, and NGC 5866. Using... -
New PN in southern Galactic Bulge
We present the results of a deep and uniform narrowband H{alpha} imaging survey for planetary nebulae (PNs) in the southern Galactic bulge. In our survey, we have found 56 new... -
PNe in M51, M96 & M101
We report the results of an [O III]{lambda}5007 survey for planetary nebulae (PNs) in three spiral galaxies: M101 (NGC 5457), M51 (NGC 5194/5l95), and M96 (NGC 3368). By... -
PNe in the Coma I region
We present the result of an [OIII]500.7nm survey for planetary nebulae (PNe) in three galaxies of the Coma I group: NGC 4278 (Hubble type E1), NGC 4494 (E1), and NGC 4565... -
Magellanic Clouds PNe line intensities
We present optical and ultraviolet spectroscopic observations of planetary nebulae (PNe) in the Large (LMC) and the Small Magellanic Clouds (SMC). For the visible spectra with...
