Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..43..129m&link_type=abstract
Astrophysics and Space Science, vol. 43, Aug. 1976, p. 129-134. Research supported by the Consiglio Nazionale delle Ricerche.
Astronomy and Astrophysics
Astrophysics
10
Chromosphere, Compton Effect, Light Scattering, Red Shift, Solar Atmosphere, Solar Spectra, Line Spectra, Optical Thickness, Spectral Line Width, Stellar Models
Scientific paper
It has been shown that the redshift of a spectral line in light traversing a cool scattering medium depends on the thickness of the scattering layer and also on the shape and equivalent width of the line. The present paper brings this theoretical result into rigorous quantitative agreement with experimental measurements of spectral lines at the center of the solar disk. Redshifts and central intensities of 11 spectral lines are computed for eight values of the optical thickness of the chromosphere, and the results are compared with experimental data. It is concluded that the scattering effect plays an important role in the study of the dependence of redshift on spectral-line equivalent width, at least when the temperature of the scattering medium is less than 10,000 K.
Missana Marco
Piana A.
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