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The determination of accurate cosmic abundances from B-type stellar spectra

  • P. J. F. Brown
  • P. L. Dufton
  • F. P. Keenan
  • D. E. Holmgren
  • G. A. Warren
I. “Norman” Early-Type Stars
Part of the Lecture Notes in Physics book series (LNP, volume 401)

Abstract

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.

Keywords

Absorption Line Interstellar Medium Equivalent Width Oxygen Abundance Cosmic Abundance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • P. J. F. Brown
    • 1
  • P. L. Dufton
    • 1
  • F. P. Keenan
    • 1
  • D. E. Holmgren
    • 1
  • G. A. Warren
    • 1
  1. 1.Department of Pure and Applied PhysicsQueens University of BelfastBelfastUK

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