Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...359..499g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 20, 1990, p. 499-505.
Astronomy and Astrophysics
Astrophysics
31
Extreme Ultraviolet Radiation, Gas Ionization, Interstellar Matter, Stellar Spectra, Ultraviolet Spectra, White Dwarf Stars, Helium, Stellar Atmospheres, Stellar Temperature
Scientific paper
The measurement of the extreme ultraviolet spectrum of the nearby hot white dwarf G191 - B2B is reported. The results are used to derive interstellar neutral column densities of 1.6 + or - 0.2 x 10 to the 18th/sq cm and 9.8 + 2.8 or - 2.6 x 10 to the 16th/sq cm for H I and He I, respectively. This ratio of neutral hydrogen to neutral helium indicates that the ionization of hydrogen along the line of sight is less than about 30 percent unless significant helium ionization is present. The scenario in which the hydrogen is highly ionized and the helium is neutral is ruled out by this observation.
Bowyer Stuart
Green Jeremy
Jelinsky Patrick
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