Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985afz....23..133s&link_type=abstract
(Astrofizika, vol. 23, July-Aug. 1985, p. 133-143) Astrophysics (ISSN 0571-7132), vol. 23, no. 1, Jan. 1986, p. 452-458. Transla
Astronomy and Astrophysics
Astronomy
3
Heavy Ions, Interstellar Gas, Ion Density (Concentration), Stellar Envelopes, White Dwarf Stars, Absorption Spectra, Conductive Heat Transfer, H Ii Regions, Nonequilibrium Ionization, Stellar Spectra, Sun, Ultraviolet Astronomy
Scientific paper
Possible mechanisms of creating ions the absorption lines of which are seen in the spectra of nearby (d < 50 pc) white dwarfs are considered. It is shown that the interstellar ion Si III is partially formed in the thermal conductivity zone between the H I cloud (T = 104K) in which the sun is placed and the surrounding coronal gas (T > 105K), and partially in the H II zone around the observed star. The column density ratio N(Si IV)/N(Si III) ⪆ 10 observed in the direction of the white dwarf G191-B2B finds the best explanation in the model of a non-stationary H II zone around this star.
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