The Angular Expansion and Distance of the Planetary Nebula BD+30 3639 (2002)
Li, Jianyang, Harrington, J. Patrick, Borkowski, Kazimierz J.
The WFPC2 camera aboard the HST was used to obtain images of the planetary nebula BD+30 3639 at two epochs separated by 5.663 years. The expansion of the nebula in the H-alpha and [N II] bands has...
Searching for Jets in Asymmetrical Nebulae with the Hubble Space Telescope (1999)
Harrington, J. Patrick, Borkowski, Kazimierz J.
The jets seen in NGC 6543 motivated us to search for similar features in other PNe. Our HST snapshot program looked for jets using the [N II] and H-alpha narrow-band filters. Although spectacular...