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PN and HII regions of West and East of NGC 3109
Images obtained with the ESO VLT and FORS1 in [O III] 5007 on- and off-band, as well as r_Gunn filters, are analyzed to search for planetary nebula (PN) candidates. In the... -
Chemical compositions of 48 WR planetary nebulae
Chemical compositions and other properties of planetary nebulae around central stars of spectral types [WC], [WO], and wels are compared with those of "normal" central stars, in... -
Optical spectroscopy of 253 IRAS sources
We study the optical spectral properties of a sample of stars showing far infrared colours similar to those of well-known planetary nebulae. The large majority of them were... -
Magellanic Clouds PNe abundances
We present the second part of an optical spectroscopic study of planetary nebulae in the LMC and SMC. The first paper, Leisy & Dennefeld (1996, Cat. ), discussed the CNO... -
Galactic Open Cluster Candidates
An inspection of DSS and 2MASS images of selected Milky Way regions led to the discovery of 66 stellar groupings whose morphologies, color-magnitude diagrams and stellar density... -
Integrated spectrum of NGC 7027
We present deep optical spectra of the archetypal young planetary nebula (PN) NGC 7027, covering a wavelength range from 3310 to 9160{AA}. The observations were carried out by... -
Evolved stars in the MSX survey
We investigate the evolution of oxygen- and carbon-rich AGB stars, post-AGB objects, and planetary nebulae using data collected mainly from the MSX catalogue. Magnitudes and... -
Abundances in planetary nebulae
We present new spectroscopic data (43 objects) and derived plasma diagnostics and abundances (164 objects) of a sample of planetary nebulae in the direction of the Galactic... -
Chemical abundances of planetary nebulae
In this paper, we report new observations and derive chemical abundances for a sample of 26 planetary nebulae (PN) located in the anti-center direction. Most of these nebulae... -
Planetary nebulae near the Galactic Center
We surveyed the central 4x4 degrees of the Galactic center for planetary nebulae in the light of [S III] {lambda}9532 and found 94 PNe that were not previously known, plus 3... -
Crystalline silicates around evolved stars
This is the first paper in a series of three where we present the first comprehensive inventory of solid state emission bands observed in a sample of 17 oxygen-rich... -
Abundances of PN towards Galactic bulge
In this work we report spectrophotometric observations of a planetary nebula sample towards the galactic bulge. A total of 45 PNe was observed and their physical parameters... -
Candidate Planetary Nebulae in M81
File table1.dat contains the identification number, the coordinates (2000), the [OIII]5007 and the H{alpha}+[NII] flux of the candidate PNe detected in Messier 81, using the... -
New galactic bulge PNe
We observed 64 newly identified galactic bulge planetary nebulae in the radio continuum at 3 and 6 cm with the Australia Telescope Compact Array. We present their radio images,... -
Radio emission from planetary nebulae
We have analysed the radio fluxes for 264 planetary nebulae for which reliable measurements of fluxes at 1.4 and 5 GHz, and of nebular diameters are available. For many of the... -
Abundances of HDE 341617
Detailed atmospheric abundances have been calculated for a sample of A-G supergiant stars with IR fluxes and/or high galactic latitudes. HD 172481 and HD 158616 show clear... -
Candidate Planetary Nebulae in M 33
File table1.dat contains the identification number, the coordinates (2000), the H{alpha}+[NII] flux and the [OIII]5007 flux of the PNe detected in Messier 33, with the Isaac... -
Abundance gradients in planetary nebulae
Radial abundance gradients of the element ratios O/H, Ne/H, S/H, and Ar/H are determined on the basis of a sample of disk planetary nebulae. The behaviour of the gradients at... -
PN abundances in five galaxies
We have collected photometric and spectroscopic data on planetary nebulae (PNe) in 5 galaxies: the Milky Way (bulge), M31 (bulge), M 32, the LMC and the SMC. We have computed... -
Planetary nebulae abundances
Long slit spectrophotometry of 13 bipolar planetary nebulae has been used to study their physical and chemical properties. In each nebula, one to seven different spatial regions...