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Optical and Infrared Imaging and Spectroscopy of the Multiple-Shell Planetary Nebula NGC 6369
Gerardo Ramos-Larios, Martin A. Guerrero, Roberto Vazquez +1
NGC 6369 is a double-shell planetary nebula (PN) consisting of a bright annular inner shell with faint bipolar extensions and a filamentary envelope. We have used ground- and space…
Optical and Mid-Infrared Observations of the Planetary Nebula NGC 6781
J. P. Phillips, Gerardo Ramos-Larios, Martin A. Guerrero
Although the planetary nebula NGC 6781 appears to possess an elliptical morphology, its kinematic and emission characteristics are in many ways unusual, and it is possible that it…
IRAS 18113-2503: the water fountain with the fastest jet?
Jose F. Gomez, J. Ricardo Rizzo, Olga Suarez +3
We present Expanded Very Large Array (EVLA) water maser observations at 22 GHz toward the source IRAS 18113-2503. Maser components span over a very high velocity range of ~500 km/s…