Study of Some - and Planetary Nebulae

Details Study of Some - and Planetary Nebulae Study of Some - and Planetary Nebulae

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.1265k&link_type=abstract

HST Proposal ID #1265

Physics

Hst Proposal Id #1265

Scientific paper

FOC filter and spectrographic observations are proposed of circumstellar HII regions around hot stars: one ring nebula around a Wolf-Rayet star and two planetary nebulae OVI- class central stars. The scientific aim is to study the morphology of the edge of these nebulae in different forbidden and semi- forbidden emission lines of CIII, OIII, Mg V and ArV, and the chemical abundance ratio's in the nebulae. The morphology is a powerful indicator for the origin of the nebulae (e.g.mass loss, ejection). The chemical abundance ratios, notably the C/O ratio, in the nebulae are significant measures on the evolutionary state of the central stars. The FOC enables observations, also in the visible wavelength region, at a spatial resolution at least 100 times as high as has been posssible so far.

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