Statistics – Computation
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...158...83d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 158, no. 1-2, April 1986, p. 83-88. Research supported by Naturvetenskapliga F
Statistics
Computation
45
Iron, Line Spectra, Solar Granulation, Solar Spectra, Computational Astrophysics, Convection, Photosphere, Radial Velocity, Wavelengths
Scientific paper
Convective motions of solar granulation are manifest in the spatially unresolved spectrum as slight asymmetries and wavelength shifts of photospheric spectral lines. In a previous paper (Dravins et al., 1981) that dependence for Fe I lines with line strength, excitation potential and wavelength region was analyzed. This paper extends that work to Fe II lines, examining bisector shapes and wavelength shifts of "unblended" Fe II lines both at disk center and in integrated sunlight. Fe II lines form predominantly in the hotter and denser regions of the deep photosphere, and these different line formation conditions for Fe II manifest themselves in well-defined differences from Fe I: the average Fe II bisectors show a more articulated curvature and a larger convective blueshift. Synthetic spectral lines, computed from a three-dimensional time-dependent hydrodynamic simulation of solar photospheric convection confirm the observed behavior.
Dravins Dainis
Larsson Bengt
Nordlund Aake
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