Planetary Nebulae Results from the Infrared Space Observatory

Details Planetary Nebulae Results from the Infrared Space Observatory Planetary Nebulae Results from the Infrared Space Observatory

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002rmxac..12..106r&link_type=abstract

Ionized Gaseous Nebulae, a Conference to Celebrate the 60th Birthdays of Silvia Torres-Peimbert and Manuel Peimbert, Mexico City

Astronomy and Astrophysics

Astronomy

1

Ism: Structure, Planetary Nebulae: General

Scientific paper

Observations with the Infrared Space Observatory (ISO) provide a means to assess important properties of the plasma in gaseous nebulae, including planetary nebulae (PNs). We present some results for average electron densities that have been determined from the flux ratios of several fine-structure, infrared emission lines. Because the ISO spectroscopic aperture was always at least as large as 14'' × 20'', these represent macroscopic measurements for our sample of PNs. We find some instances of the observed line flux ratio being clearly out of range of the theoretical predictions using current atomic data. In these cases, the ISO data cannot presently be used with these atomic data to derive electron density, but rather provide direction for needed improvements in the atomic collision strengths.

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