Non-LTE Formation of Ba II Resonance Lines

Details Non-LTE Formation of Ba II Resonance Lines Non-LTE Formation of Ba II Resonance Lines

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...3e..16o&link_type=abstract

Solar Active Regions and 3D Magnetic Structure, 26th meeting of the IAU, Joint Discussion 3, 16-17 August, 2006, Prague, Czech R

Physics

Scientific paper

We investigate the formation of the resonance lines of ionized Barium in the Solar atmosphere. We have constructed atomic model of Ba II, which includes 40 energy levels, 99 bound-bound and 39 bound-free transitions. Using the numerical solution of radiative transfer equation together with the statistical equilibrium equations we calculate emergent profiles of the Ba II 4554 A resonance line under different conditions. Line profiles are calculated in both standard 1D and 3D atmospheric models in LTE and non-LTE approximations. We found that non-LTE effects are very important for this line. Main NLTE mechanisms are the resonance line scattering and photon losses. In 1D the line shape is most sensitive to the following parameters: Barium abundance, collisional strengths and macroturbulent velocity. Sensitivity to the uncertainties in oscillator strengths is not so high. Taking precise theoretical values of collisional strengths by Barklem & O'Mara (1998) we found the best agreement with observations for the abundance close to the "classical" value of 2.13. In 3D calculated profiles are in a good agreement with the observations. In 1D the agreement is worse. Thus it is critical for the modelling of Ba II lines to use the 3D non-LTE radiative transfer.

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