Abstract
view Abstract Citations (25) References (43) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The ionization of the very local interstellar gas. Reynolds, R. J. Abstract Bertaux et al. (1985) have pointed out that the low ratio of atomic hydrogen to atomic helium densities (nH ≈ 0.05 cm-3, nHeI ≈ 0.02 cm-3) derived for the very local interstellar gas from interplanetary UV and EUV observations suggest that the local interstellar hydrogen is substantially ionized (nHII/nHI ≈ 3). In steady state this would imply an ionization rate ≡10-13s-1H-atom-1, which is much higher than that produced by cosmic rays or the diffuse X-ray background. An examination of available data on B stars and known hot white dwarf stars in the solar neighborhood reveals that the photon flux from these sources also is not capable of accounting for such a high ionization rate. The ionization appears to require either a local EUV flux of 104 - 105 photons cm-2s-1 in the 14 - 24 eV band or a transient event within the last (2 - 5)×105yr. Publication: The Astronomical Journal Pub Date: September 1986 DOI: 10.1086/114197 Bibcode: 1986AJ.....92..653R Keywords: Gas Ionization; Interstellar Gas; B Stars; Hot Stars; Solar Radiation; Spectrum Analysis; Ultraviolet Spectra; White Dwarf Stars; Astrophysics full text sources ADS | data products SIMBAD (37)
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