Abundance variations in high-velocity interstellar gas

Details Abundance variations in high-velocity interstellar gas Abundance variations in high-velocity interstellar gas

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...211l.139s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 211, Feb. 1, 1977, p. L139-L143.

Astronomy and Astrophysics

Astronomy

61

Abundance, Interstellar Gas, Radial Velocity, Ultraviolet Spectra, Metal Ions, Oao 3, Spaceborne Astronomy

Scientific paper

Based on line-of-sight models and profile fitting, abundance variations of Ca, Si, Fe, and Na in high-velocity interstellar clouds toward Mu Columbae, HD 28497, and HD 50896 are discussed. The correlation of larger ratios N(Ca II)/N(Na I) with increasing radial velocity in clouds with absolute values of radial velocity from 20 to 100 km/s, is shown to quite likely be due to abundance variations in Ca rather than an ionization effect. Copernicus UV data show that the ratios N(Fe II)/N(S II) and N(Si II)/N(S II) have the same velocity correlation as Ca II, and the ambiguity concerning the relative abundance of Na I to hydrogen is removed. Theories of grain disruption are discussed as they relate to the observed Ca, Si, and Fe enhancements and their correlation with cloud velocity.

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