The asymmetry of photospheric absorption lines. I - an analysis of mean solar line profiles

Details The asymmetry of photospheric absorption lines. I - an analysis of mean solar line profiles The asymmetry of photospheric absorption lines. I - an analysis of mean solar line profiles

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...116..332k&link_type=abstract

Astronomy and Astrophysics, vol. 116, no. 2, Dec. 1982, p. 332-340.

Astronomy and Astrophysics

Astrophysics

27

Absorption Spectra, Asymmetry, Line Spectra, Perturbation Theory, Photosphere, Solar Spectra, Spectrum Analysis, Convective Heat Transfer, Iron, Main Sequence Stars, Solar Temperature, Temperature Dependence

Scientific paper

The paper investigates the information content of the shifts and asymmetries of mean line profiles and analyzes in detail, with the aid of a perturbation analysis and a two-stream model, that of the solar spectrum observed at the center of the disk. It is shown that the characteristic C-shape of the line bisectors depends mainly on the run of temperature fluctuations, correlated with velocities, in combination with the temperature-dependent opacities. The degree of asymmetry (and shift) is not only a function of the one-point correlation between temperature and velocity - which measures the convective flux but depends also strongly on two-point correlations. The latter can produce an asymmetry in the absence of heat transport along the line of sight - at the limb, for instance. The usefulness of measurements of mean line profiles as a test of convective models is demonstrated by examining the general characteristics of the asymmetry of the Fe I 7557.6 nm line in both the sun and examples of other main-sequence stars.

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