Interstellar absorption lines in high-resolution IUE spectra of cataclysmic variables

Details Interstellar absorption lines in high-resolution IUE spectra of cataclysmic variables Interstellar absorption lines in high-resolution IUE spectra of cataclysmic variables

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...335..829m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 335, Dec. 15, 1988, p. 829-843. DOE-supported research.

Astronomy and Astrophysics

Astrophysics

41

Cataclysmic Variables, Interstellar Extinction, Iue, Spectral Resolution, Ultraviolet Spectroscopy, Cygnus Constellation, Dwarf Novae, Interstellar Matter, Solar Neighborhood, X Ray Spectra

Scientific paper

High-resolution ultraviolet spectra of five cataclysmic variables obtained with the IUE are used to investigate the character of the interstellar medium in the vicinity of the sun. These spectra reveal narrow absorption features of neutral and singly ionized interstellar species, and, in SS Cyg, narrow velocity-shifted absorption features of C IV, Si IV, and Si III. Using the column densities implied by the absorption features of the neutral and singly ionized species, values for the depletion of Si, Mg, Mn, and Fe from the gas phase of the interstellar medium in the vicinity of the sun are obtained. These hydrogen column densities are of particular importance in constraining the soft X-ray luminosity of cataclysmic variables because of the severe attenuation of the soft X-ray flux of cataclysmic variables by photoelectric absorption in the interstellar medium. In addition, using the column densities implied by the absorption features of C IV, Si IV, and Si III in the spectrum of SS Cyg, the existence of an expanding H II region of interstellar gas photoionized by he EUV and soft X-ray flux of this cataclysmic variable are inferred.

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