Non-LTE line formation in early B and late O stars. IV - Singly ionized nitrogen

Astronomy and Astrophysics – Astrophysics

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B Stars, Line Spectra, Nitrogen Ions, Nonequilibrium Thermodynamics, O Stars, Stellar Spectra, Oxygen Ions, Photoionization, Stellar Atmospheres, Stellar Models

Scientific paper

An extensive model atom for a non-LTE line formation determination for N II is discussed. Based on B star model atmospheres, a grid of equivalent widths for over 35 N-II lines in the wavelength region from 4000-5000 A has been obtained in both non-LTE and LTE. An abundance determination for nitrogen in Tau Sco using the model atom demonstrates that the non-LTE analysis produces reliable results.

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