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

view Abstract Citations (211) References (71) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Composition of Interstellar Clouds in the Disk and Halo. I. HD 93521 Spitzer, Lyman, Jr. ; Fitzpatrick, Edward L. Abstract 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. Publication: The Astrophysical Journal Pub Date: May 1993 DOI: 10.1086/172664 Bibcode: 1993ApJ...409..299S Keywords: Chemical Composition; Electron Density Profiles; Galactic Halos; Interstellar Gas; Ultraviolet Astronomy; Atomic Excitations; Hubble Space Telescope; Line Of Sight; Milky Way Galaxy; Astrophysics; ISM: ABUNDANCES; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 93521; ULTRAVIOLET: STARS full text sources ADS | data products SIMBAD (1) MAST (1) ESA (1) Related Materials (3) Part 2: 1994ApJ...427..232F Part 3: 1995ApJ...445..196S Part 4: 1997ApJ...475..623F