Abstract
It has been suggested that pressure shifts are the sole cause for the systematic blue shift of solar fraunhofer lines (Hart, 1974). To check this we evaluate the significance of pressure shifts for Fe i lines. The observed wavelength shifts of a large number of lines are compared with the shifts calculated for the Lennard-Jones potential following Hindmarsh et al. (1967). The Lennard-Jones potential for the interatomic forces yield pressure shifts caused by neutral hydrogen, which explain only a small fraction of the observed blue shift. It is also shown that the quadratic Stark effect contributes insignificantly to the position of Fe i lines. Table I summarizes the average line shifts for iron lines at the center of the solar disk after correction for pressure shifts.
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References
Adam, M. G.: 1958, Monthly Notices Roy. Astron. Soc. 118, 106.
Adam, M. G., Ibbetson, P. A., and Petford, A. D.: 1976, Monthly Notices Roy. Astron. Soc. 177, 687.
Altrock, R. C., November, L. J., Simon, G. W., Milkey, R. W., and Worden, S. P.: 1975, Solar Phys. 43, 33.
Beckers, J. M.: 1977, Astrophys. J. 213, 900.
Beckers, J. M. and Milkey, R. W.: 1975, Solar Phys. 43, 289.
Biermann, L.: 1941, Vierteljahrschr. Astron. Gesellsch. 76, 194.
Crosswhite, H. M: 1975, J. Research NBS 79A, 17.
Ericksen, G. and Maltby, P.: 1967, Astrophys. J. 148, 833.
Gingerich, O., Noyes, R. W., Kalkofen, W., and Cuny, Y.: 1971, Solar Phys. 18, 347.
Griem, H.: 1968, Phys. Rev. 165, 258.
Hart, M.: 1974, Astrophys. J. 187, 393.
Hindmarsh, W. R., Petford, A. D., and Smith, G.: 1967, Proc. Roy. Soc. London A297, 296.
Hofsäss, D.: 1975, J. Quant. Spectros. Radiat. Transfer 15, 901.
Kostik, R. I. and Orlova, T. V.: 1972, Solar Phys. 26, 42.
O'Brien, J. E.: 1971, Solar Phys. 19, 314.
Panther, S. F. and Foster, J. S.: 1937, Proc. Roy. Soc. London A162, 336.
Pierce, A. K. and Breckenridge, J. B.: 1973, KPNO Contribution 559.
Sahal-Bréchot, S.: 1969a, Astron. Astrophys. 1, 91.
Sahal-Bréchot, S.: 1969b, Astron. Astrophys. 2, 322.
Schröter, E. H.: 1957, Zeitschr. f. Astrophys. 41, 141.
Spitzer, L.: 1950, Monthly Notices Roy. Astron. Soc. 110, 216.
St. John, C. E.: 1928, Astrophys. J. 67, 195.
van Rensbergen, W., de Doncker, E., and Deridder, G.: 1975, Solar Phys. 40, 303.
Unsöld, A.: 1955, Physik der Sternatmosphären, 2nd edition, Springer-Verlag, Berlin.
Warner, B.: 1969, Observatory 89, 11.
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Operated by the Association of Universities for Research in Astronomy, Inc. under contract AST 74-04129 with the National Science Foundation.
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Beckers, J.M., De Vegvar, P. Some comments on the limb shift of solar lines. Sol Phys 58, 7–15 (1978). https://doi.org/10.1007/BF00152550
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DOI: https://doi.org/10.1007/BF00152550