Determination of cosmic abundances

Details Determination of cosmic abundances Determination of cosmic abundances

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990iraj...19..158k&link_type=abstract

Irish Astronomical Journal (ISSN 0021-1052), vol. 19, Mar.-Sept. 1990, p. 158-160. Research supported by SERC.

Astronomy and Astrophysics

Astronomy

Abundance, Interstellar Extinction, Interstellar Matter, Stellar Atmospheres, Absorption Spectra, Chemical Composition, Early Stars, Line Spectra, Main Sequence Stars, Stellar Spectra

Scientific paper

Accurate contemporary cosmic abundances are derived using weak stellar absorption lines observed in the spectra of main sequence early-type stars. Initially, weak lines of argon are observed by comparing measured stellar Stromgren colors, beta indices, and Ar II equivalent widths with those predicted by local thermodynamic equilibrium model atmosphere codes. A mean abundance of 6.49 + or - 0.04 dex is obtained, and this value is considered to represent an accurate assessment of the current cosmic abundance value of argon in the solar neighborhood. This result is compared with those of experiments, and it is pointed out that the error estimate in this study is 12 percent or less.

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