Composition of interstellar clouds in the disk and halo. I - HD 93521

Details Composition of interstellar clouds in the disk and halo. I - HD 93521 Composition of interstellar clouds in the disk and halo. I - HD 93521

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409..299s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 1, p. 299-318.

Astronomy and Astrophysics

Astronomy

197

Chemical Composition, Electron Density Profiles, Galactic Halos, Interstellar Gas, Ultraviolet Astronomy, Atomic Excitations, Hubble Space Telescope, Line Of Sight, Milky Way Galaxy

Scientific paper

Interstellar column densities of Fe, S, Si, Mn, and Mg in their dominant ionization state, as well as of C(+) and S(2+), are presently derived from analyses of HST UV observations of the Galactic halo star HD 93521. Ratios of column densities for the dominant species yield approximations of the logarithmic depletion D(X) in the warm, primarily neutral H gas which produces each of the resolved components. Variations of D between components are highly correlated between elements; about two Fe atoms leave the grains for every Si atom, as if these atoms were primarily bound in the Fe2SiO4 molecules within the grain cores.

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