Element depletions in interstellar gas. II - The density-dependence of calcium and sodium depletions

Details Element depletions in interstellar gas. II - The density-dependence of calcium and sodium depletions Element depletions in interstellar gas. II - The density-dependence of calcium and sodium depletions

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.206..337p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 206, Jan. 15, 1984, p. 337-350.

Astronomy and Astrophysics

Astronomy

59

Calcium, Density Distribution, Depletion, Interstellar Gas, Sodium, Ultraviolet Astronomy, Astronomical Spectroscopy, Iue, Spatial Distribution, Stellar Spectra, Visible Spectrum

Scientific paper

The behavior of Ca and Na depletions in interstellar gas is studied in view of complementary, high resolution optical and UV spectra for nine stars in the same region of sky. The optical absorption lines of Ca II and Na I are analyzed to determine their column densities in each line-of-sight, and the UV data are used to estimate H column densities and to perform ionization balance calculations from which the contributions to Ca and Na abundances from unobserved ion stages can be deduced. The resultant element depletions relative to solar abundances are compared with estimates of the average interstellar gas density in different lines-of-sight. The depletion of Ca is a strong function of present interstellar medium densities, while Na appears to be depleted by a constant factor of about 4 over the range of densities sampled. Shock sputtering of grains plays an important role in determining element depletions, even in low velocity interstellar gas.

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