We have studied the amount of diffuse light in two galaxy groups, Leo and HCG 44 through the detection of intragroup planetary nebulae (IGPNe). The emission...
Discovery of a planetary nebula surrounding the symbiotic star DT Serpentis
We report the discovery of a planetary nebula centered on the poorly studied symbiotic binary star DT Ser. In a few other symbiotic stars spatially resolved...
Discovery of an eclipsing dwarf nova in the ancient nova shell Te 11
We report on the discovery of an eclipsing dwarf nova (DN) inside the peculiar, bilobed nebula Te 11. Modelling of high-speed photometry of the eclipse finds...
Discovery of close binary central stars in the planetary nebulae NGC 6326 and NGC 6778
We present observations proving the close binary nature of the central stars belonging to the planetary nebulae (PNe) NGC 6326 and NGC 6778. Photometric...
Distance determination to PNe using the extinction-distance method
We present individual distances to three PNe: NGC 6537, NGC 6781 and NGC 7027, determined by the extinction-distance method. These objects are part of a larger...
Do the Various Types of PNe Knots Differ in Terms of their Physical Properties? The case of NGC662
Years ago we have compiled all the available optical data in the literature to build a comprehensive classification of the low-ionization structures (LIS), as...
Dust properties in the circumstellar shells of evolved stars: Observational constraints from ISO and Spitzer infrared spectroscopy
We present the results of a systematic analysis of the solid state features identified in the circumstellar environments of a large sample of evolved stars with...
Dust scattering and kinematics within the envelope of IRAS 09371+1212.
We have acquired narrow and broad band imaging, together with high and low resolution spectroscopy for the source IRAS 09371+1212. As a result, we are able to...
Early results from ChanPLaNS: Mystery of hard X-ray emitting CSPNe†
We are presently using the Chandra X-ray Observatory to conduct the first systematic X-ray survey of planetary nebulae (PNe) in the solar neighborhood. The...