Formation of the Luminosity-Sensitive 0 I Multiplet at 7774 A
Abstract
We have calculated line profiles and equivalent widths for the 7774 A multiplet of 0 i for model atmospheres in the range = K for surface gravities in the range log g = 4. .0. A kinetic equilibrium (KE) treatment of line formation can partially account for the observed luminosity sensitivity of these lines and considerably modifies the derived microturbulent broadening parameter. Line profiles obtained from KE line-formation theory are much deeper than LTE profiles, and we present new observations of Canopus (F0 Ib) to verify the essential correctness of our treatment. Subject headings: atmospheres, stellar - line formation - spectra, infrared
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 1974
- DOI:
- 10.1086/152600
- Bibcode:
- 1974ApJ...187..147J