Non-LTE calculations of N II line strengths in B-type stars

Details Non-LTE calculations of N II line strengths in B-type stars Non-LTE calculations of N II line strengths in B-type stars

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....95...24d&link_type=abstract

Astronomy and Astrophysics, vol. 95, no. 1, Feb. 1981, p. 24-31.

Astronomy and Astrophysics

Astrophysics

32

B Stars, Nitrogen Ions, Nonequilibrium Thermodynamics, Stellar Oscillations, Stellar Spectra, Atmospheric Models, Atomic Structure, Early Stars, Stellar Atmospheres, Visible Spectrum

Scientific paper

New oscillator strengths are presented for six of the strongest N II singlet and triplet multiplets in the visible spectra of early-type stars. The atomic structure calculations use complex configuration interaction wavefunctions which give energy differences accurate to a few percent, and oscillator strengths which should have an accuracy of ten percent or better. These atomic data are then used in non-LTE model atmosphere calculations based on the 'complete linearization procedure'. Equivalent widths, together with the corresponding LTE values, are tabulated for 3 singlet (No. 12, 15, and 55) and 3 triplet (Nos. 3-5) multiplets, for effective temperatures between 20,000 and 32,500 K, a logarithmic gravity of 4 and a range of microturbulent velocities and nitrogen abundances.

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