The determination of accurate cosmic abundances from B-type stellar spectra
We have obtained high-resolution, high-signal-to noise observations of weak A II and O II absorption lines formed in the atmospheres of main-sequence early-type stars. The observed line strengths have been combined with equally well determined oscillator strengths, in an analysis which used both LTE and non-LTE model atmosphere techniques. Cosmic argon and oxygen abundances (on a logarithmic scale with hydrogen = 12) of [A] = 6.49 and [O] 8.93 have been determined; these should have an accuracy of ±0.05 dex.
KeywordsAbsorption Line Interstellar Medium Equivalent Width Oxygen Abundance Cosmic Abundance
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