The ionization of the local ISM based upon constraints from IUE data

Details The ionization of the local ISM based upon constraints from IUE data The ionization of the local ISM based upon constraints from IUE data

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281b.239c&link_type=abstract

In ESA, Proceedings of the Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite, Volume 2 p 239-241 (SEE N89

Astronomy and Astrophysics

Astronomy

Gas Ionization, Interstellar Gas, Iue, Photoionization, Spaceborne Astronomy, Ultraviolet Astronomy, Ultraviolet Spectra, Helium, Hydrogen, Interstellar Chemistry, Plasma Density, Stellar Spectra

Scientific paper

Photoionization calculations for the local interstellar medium (LISM), based on constraints imposed by H I column density estimates derived from IUE and Copernicus data toward nearby B stars and hot white dwarfs are presented. The nearby hot white dwarfs dominate the stellar contribution to the EUV radiation field. Considering stellar contributions to the EUV background alone, lower limits to the hydrogen and helium fractional ionization of 0.091 and 0.089 respectively are found. Since helium is found to be significantly ionized in the local interstellar medium it has important implications in understanding EUV and soft X-ray observations of hot white dwarfs.

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