Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...233..168v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 1, July 1990, p. 168-176. Research supported by the Caja General de A
Astronomy and Astrophysics
Astrophysics
1
Chemical Composition, Gas Ionization, Interstellar Gas, Abundance, Hydrogen Clouds, Iue, Stellar Cores, Stellar Envelopes
Scientific paper
The behavior of the elemental depletions in the ISM along lines of sight with a very low value of the average hydrogen density is examined. A simple model in the frame of the McKee-Ostriker (1977) theory has been used to estimate the line-of-sight filling factors as a function of n-bar for those interstellar phases in which a significant degree of ionization is expected. The results show that a substantial fraction of ionized gas outside classical H II regions may well be present along the line of sight when n-bar is less than about 0.1/cu cm. If this effect is neglected, the chemical abundances relative to hydrogen can be overestimated up to 0.5 dex in logarithm, and the depletions underestimated by the same amount. A recent IUE survey of interstellar abundances has been reanalyzed, and it is found that for all the elements investigated the slope of the correlation D(app)-log n-bar is steeper in the low-density range. This disagrees with recent models for elemental depletions.
Centurion Martin
Vladilo Gg.
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