The Depletion Behavior of Chromium Relative to Zinc in the Magellanic Clouds

Details The Depletion Behavior of Chromium Relative to Zinc in the Magellanic Clouds The Depletion Behavior of Chromium Relative to Zinc in the Magellanic Clouds

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5887r&link_type=abstract

HST Proposal ID #5887

Physics

Hst Proposal Id #5887 Interstellar Medium

Scientific paper

Observations of singly ionized zinc and chromium in the ISM primarily trace the depletion characteristics of metals in H I gas. Zn II does not deplete onto dust grains, and can provide an accurate metallicity measure. Conversely, Cr II is readily removed from the gas phase, and the Cr/Zn column density ratio provides a sensitive measure of dust destruction and contributing physical conditions within the absorbing material. In this proposal we are seeking time to use the GHRS ECH-B to measure the Cr/Zn ratio in Magellanic Cloud gas using four background sources. We will use these measurements to help interpret values obtained in high redshift (0.6 <= z <= 3) damped Lyman-Alpha systems which to date have only been compared to published Galactic values toward two stars, namely Zeta Ophiuchi and Chi Persei. From an archive study of 10 Galactic stars we have just finished, we have discovered that these 2 stars are not typical: rather, there is a much larger spread in the Cr/Zn ratio than previously thought, thus complicating but not invalidating comparison with high- redshift systems. Our proposed determination of Cr/Zn in two external galaxies known to have different extinction curves than the Milky Way will be used to construct a valid extragalactic baseline against which the Galactic and QSO observations can be compared.

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