Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.176..193m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 176, July 1976, p. 193-199. Research supported by the Science Research
Astronomy and Astrophysics
Astronomy
27
Absorption Spectra, Hydrogen Atoms, Interstellar Matter, Ultraviolet Spectra, B Stars, Crab Nebula, Far Ultraviolet Radiation, Interstellar Extinction, Molecular Gases, Spaceborne Astronomy, X Ray Sources
Scientific paper
The X-ray absorption column of 3U 0352+30 obtained with the Copernicus X-ray telescopes is compared with the atomic and molecular hydrogen column densities in the line of sight to X Per, as measured with the Copernicus ultraviolet telescopes, and with the visible reddening of X Per, by means of reddening/X-ray absorption-column relationships. The results are consistent with both the star and X-ray source being equidistant. When comparing X-ray absorbing column densities with those derived by other means, it is necessary to include the effects of molecular hydrogen in the line of sight to X Per and, in particular, the related number of medium-weight elements. It is suggested that failure to do this in previous work may account for reported discrepancies between the X-ray and radio column densities to the Crab Nebula and other sources. The far-ultraviolet extinction curve of X Per is presented.
Drake James F.
Hawkins Frederick J.
Mason Keith O.
Sanford Peter W.
White Nicholas E.
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