Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5106w&link_type=abstract
HST Proposal ID #5106
Other
Hst Proposal Id #5106 Interstellar Medium
Scientific paper
Observations of planetary nebulae utilizing the WF/PC are based upon the high angular resolution achievable. Seeing limited images of NGC 7293 the Helix Nebula resolve structures down to the order of E+15 cm. At 0.1 arcsec resolution, structures as small as E+14 to E+15 cm should be resolvable in a number of planetary nebulae. At these dimensions velocities of a few km/sec correspond to transit times of less than 100 years yet some of these condensations occur as filaments some 10 to 100 times the narrow width. What accounts for these "long lived" condensations? Can they be explained as ionization structures, shock fronts or successive shell ejections? Is there a pattern of mass loss as polar plumes or equatorial disks or magnetic containment? The possibility of addressing these aspects of stellar mass loss are tremendously enhanced by the resolution possible with WF/PC. The other objective of this program is to repeat the measurements on a few years baseline in order to study the temporal variations of well defined condensation. This may provide distance determinations as well as dynamical information. The targets/filters are: NGC7293, NGC246 and NGC1360 with F656N and F658N which will isolate H-Alpha and [NII] respectively. NGC7293, NGC6853 and NGC 7027 are reobserved with F656N.
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