A critical analysis of interstellar Zn and CR as galactic abundance benchmarks for quasar absorbers

Details A critical analysis of interstellar Zn and CR as galactic abundance benchmarks for quasar absorbers A critical analysis of interstellar Zn and CR as galactic abundance benchmarks for quasar absorbers

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...445l..27s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 445, no. 1, p. L27-L30

Astronomy and Astrophysics

Astronomy

39

Absorption Spectra, Abundance, Chromium, Interstellar Gas, Lyman Alpha Radiation, Milky Way Galaxy, Quasars, Ultraviolet Astronomy, Zinc, Galactic Evolution, Hubble Space Telescope, Iue, Red Shift, Vapor Phases

Scientific paper

We present interstellar gas-phase abundances of zinc and chromium in the Milky Way for comparison with the abundances of these elements in damped Ly-alpha systems at redshifts near z approximately 2. We make use of both IUE (International Ultraviolet Explorer) and GHRS (Goddard High Resolution Spectrograph) archival information in deriving the Milky Way values and find that the average difference in (Zn/H) and (Cr/Zn) between the Milky Way and damped Ly-alpha systems at large N(H1) is about 0.9 dex. The Zn/H values we find for the Milky Way are approximately -0.2 to -0.7 dex below solar and are due in large part to depletion of Zn onto dust grains. The amount of this gas-phase depletion is variable and depends upon the H1 column density and molecular fraction of the gas. Milky Way sight lines having low molecular fractions have values of (Zn/H) within approximately 0.2 dex of the solar value. Combined with larger values of (Cr/Zn) found for the damped Ly-alpha systems, this result confirms that measures of (Zn/H) should accurately reflect the lower gas-phase abundances of Zn found in these systems.

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