Narrow-band Images of Several Planetary Nebula in [O III]

Astronomy and Astrophysics – Astronomy

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Scientific paper

As part of a program in determining the three-dimensional structures of planetary nebula, and the mechanisms leading to the variety of structures that are observed, a set of images of several planetaries was taken through a narrow-band filter centered on the 5007
Angstrom line of [O III]. These images are the basis for developing an initial model for the morphology of each object, and as a map for further analysis using a high-resolution spectrograph to determine radial velocities of the expanding gas shells. Images were obtained using the 41 inch reflector at Yerkes Observatory of M57, M27, and NGC 7026, in order of greater structural complexity. Images were analyzed using the DS9 software package, identifying areas of interest and potential nebular structures. In addition, tri-color imaging of M57 was conducted, using both a broad band V filter and the [O III] filter for the green channel. Future work will include deep images with a larger, more efficient telescope and subsequent spectral analysis.

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