The O I triplet lambda 7773 A in late-type giant stars

Details The O I triplet lambda 7773 A in late-type giant stars The O I triplet lambda 7773 A in late-type giant stars

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....71..178e&link_type=abstract

Astronomy and Astrophysics, vol. 71, no. 1-2, Jan. 1979, p. 178-197. Research supported by the Danish National Science Research

Astronomy and Astrophysics

Astrophysics

47

Atmospheric Models, Fine Structure, Giant Stars, Late Stars, Oxygen Spectra, Stellar Spectrophotometry, Forbidden Transitions, G Stars, K Stars, Line Spectra, Nonequilibrium Thermodynamics, Stellar Atmospheres, Stellar Models

Scientific paper

Observations of the 7773-A triplet of O I in about 20 G and K giants are presented which were performed with either an echelle photoelectric spectrophotometer or a high-dispersion spectrograph. Theoretical indices proportional to the difference in equivalent width between the lines in the line and continuum regions are obtained via non-LTE calculations of the 7773-A triplet lines, LTE computations of other lines in the two narrow bands observed, and use of the continuum slope in the framework of constant-flux line-blanketed model atmospheres with effective temperatures of 4000 to 5000 K, log g of 1.5 to 3.0, A/H in the range from -0.5 to 0.5, and a microturbulent velocity of 1.7 km/s. The strengths of the 7773-A triplet lines and the 6300-A forbidden line of O I (computed in LTE) in different model atmospheres are examined, and it is found that the non-LTE effect for the 7773-A lines is to increase the equivalent widths by 10% to 30%. The behavior of the triplet lines in a model atmosphere with an effective temperature of 7600 K is briefly considered.

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