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Imaging and Spectroscopy of the Planetary Nebula NGC 6778
Vicente Maestro, Martin A. Guerrero, Luis F. Miranda
We present narrow-band images and long-slit echelle spectra of the planetary nebula (PN) NGC 6778. The data show this PN as bipolar, with a very prominent low-excitation equatorial…
Multiple Point-Symmetric Ejections in IC 4634
Martin A. Guerrero, Luis F. Miranda, You-Hua Chu
We present a spatio-kinematical study of the planetary nebula (PN) IC 4634 which has experienced several episodes of point-symmetric ejections oriented at different directions. The…
X-ray Observations of Planetary Nebulae
M. A. Guerrero, Y. -H. Chu, R. A. Gruendl
Planetary nebulae (PNe) are an exciting addition to the zoo of X-ray sources. Recent Chandra and XMM-Newton observations have detected diffuse X-ray emission from shocked fast wind…