Centre-to-limb variation of the Ca lines in the [6160,6170] Å region and the 8662 Å Ca II triplet line. The atmospheric model used was MACKKL. In order to get the best fit for the observed intensity profile at μ = 1.0, calcium abundances and macroturbulent velocities were (A(Ca), vmacro) = (6.28 dex, 1.6 m s−1) for the LTE and (6.26 dex, 1.9 m s−1) for the NLTE synthetic profiles. The 8662 Å line produces an emission core in LTE due to the increase in temperature at τ approximately −4 in the MACKKL model; in order to avoid over-plotting, the emission cores at μ = 0.6 and 0.2 werecut. The Ca II triplet line was also modelled using the Kurucz solar model atmosphere. LTE-Kurucz profiles are the long dashed lines and NLTE-Kurucz profiles are the dot-dashed lines.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.