Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..276b&link_type=abstract
Astrophysical Journal, Part 1, vol. 224, Aug. 15, 1978, p. 276-279.
Astronomy and Astrophysics
Astrophysics
7
Convective Flow, Fraunhofer Lines, Line Shape, Photosphere, Solar Atmosphere, Solar Granulation, Correction, Error Analysis, Solar Spectra, Spectroheliographs, Wavelengths
Scientific paper
Convective motions in the solar photosphere associated with the granulation introduce an asymmetry into a spatially averaged line profile and shift the wavelength of the center of gravity to the violet. This shift leads to a significant error in absolute wavelength determinations based on spatially averaged spectra. The magnitude of the error depends on a large number of granulation and line profile parameters and must be computed separately for each line. Calculations based on modern values of the various parameters lead to a violet shift at the center of the solar disk of about 0.0035 A for the center of gravity of the photospheric line of Fe I at 6569.2 A. The correction to the Oxford measurements of this line reduces the apparent discrepancy between the observed redshift and the predicted gravitational shift by one-half. Consideration of both the Oxford and Georgetown results leads to the conclusion that there is no convincing evidence at the present time for a real discrepancy.
Bray Roger J.
Loughhead R. E.
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