Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apjs..142..285m&link_type=abstract
The Astrophysical Journal Supplement Series, Volume 142, Issue 2, pp. 285-293.
Astronomy and Astrophysics
Astronomy
4
Atomic Processes, Line: Formation, Line: Profiles, Stars: Chromospheres, Sun: Chromosphere
Scientific paper
We present a simple atomic model for the synthesis of the Al I resonance lines, near the Ca II H and K lines. We study whether the computed profiles are influenced by the choice of the atomic parameters and find that, although several cross sections are not known accurately, the line profiles do not depend on them and are therefore useful as diagnostics of the atmospheric structure. We study which transitions need not to be included in the model, in order to reduce as much as possible the computing time. We compare the profiles computed for a standard model of the quiet solar atmosphere with the observations and find very good agreement. We found that the inclusion of the proper line-blanketing opacity is fundamental for an accurate calculation of the ionization balance and that irradiation by UV lines originating in the transition region does not affect the Al I emission.
Borda Roberto Fernández
Luoni María Luisa
Mauas Pablo J. D.
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