The center-to-limb behavior of Ca i λ6573 and [Ca ii] λ7324

Details The center-to-limb behavior of Ca i λ6573 and [Ca ii] λ7324 The center-to-limb behavior of Ca i λ6573 and [Ca ii] λ7324

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...60...19a&link_type=abstract

Solar Physics, Volume 60, Issue 1, pp.19-29

Physics

9

Solar Spectrum:Limb Effect

Scientific paper

Center-to-limb measurements of the Ca i λ6573 intercombination line and the Ca ii λ7324 forbidden line are compared with synthetic profiles based on a simple representation of the non-LTE Ca-Ca+ ionization equilibrium. The effects of photoionizations from low lying excited states of neutral calcium are found to reduce the sensitivity of the λ6573 center-to-limb behavior as a thermal structure diagnostic. The synthetic center-to-limb behavior is also sensitive to uncertainties in the nonthermal broadening. Nevertheless, the measured center-to-limb behavior of λ6573 favors a ‘cool’ photospheric model similar to the Vernazza, Avrett, and Loeser model M over hotter models based on the Ca ii K wings. The non-LTE calcium abundance obtained from the disk center equivalent widths of λ6573 and λ7324 using the best fit model is A Ca≅2.1±0.2 × 10-6 (by number relative to hydrogen). Applications of these lines as diagnostics of the Ca-Ca+ ionization equilibrium in other stars are briefly discussed.

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