Analysis of the chromospheric spectrum of O I in Arcturus

Details Analysis of the chromospheric spectrum of O I in Arcturus Analysis of the chromospheric spectrum of O I in Arcturus

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214..785h&link_type=abstract

Astrophysical Journal, Part 1, vol. 214, June 15, 1977, p. 785-797.

Astronomy and Astrophysics

Astrophysics

84

Chromosphere, Near Infrared Radiation, Oxygen Spectra, Stellar Atmospheres, Ultraviolet Spectra, Absorption Spectra, H Beta Line, Line Spectra, Spectrum Analysis

Scientific paper

The ultraviolet and near-infrared spectra of O I in Arcturus are analyzed by a 15-level 14-transition model for O I and the Ayres-Linsky (1975) model chromosphere. It is found that the anomalously bright O I resonance lines at 1302, 1305, and 1306 A can be readily explained by a Ly-beta-pumped fluorescence mechanism as originally proposed by Bowen (1974). Observed equivalent widths of the near-infrared triplet and singlet lines are also consistent with the model predictions, but the intercombination lines at 1355 and 1359 A and near-infrared quintet lines may pose a problem.

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