O VI in Planetary Nebulae

Details O VI in Planetary Nebulae O VI in Planetary Nebulae

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..348..316g&link_type=abstract

Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE ASP Conference Series, Vol. 348, Proceedings of the Confe

Astronomy and Astrophysics

Astrophysics

Scientific paper

The central cavity of PNe is expected to be filled by shock-heated gas at X-ray-emitting temperatures. Diffuse X-ray emission has been detected in a few PNe with plasma temperatures of 1--3×106 K, much lower than expected from a shocked fast wind with typical velocities of ˜1000 km s-1. We have used FUSE observations of nebular O VI emission to probe the PN interiors. We find that O VI emission is correlated with detectable diffuse X-ray emission, indicating the possible presence of thermal conduction. However, a simple model suggests that the conduction efficiency is much lower than that of classical values, consistent with the implication of the observed low X-ray luminosities.

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