Computer Science
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.297..312s&link_type=abstract
Nature, vol. 297, May 27, 1982, p. 312, 313. Research supported by the Max C. Fleischmann Foundation and Science and Engineering
Computer Science
8
Line Spectra, Solar Oscillations, Stellar Models, Chemical Composition, Iron, Least Squares Method
Scientific paper
High-order solar oscillations with degrees l=3, 4, and 5 could be detected. The observations were made by measuring the difference between the shifts in the Fe 5,124 spectrum line from light integrated from a central circular portion of the solar disk and from an annular portion exterior to it. The frequencies of the octupole modes agree well with the values obtained from whole-disk measurements at the South Pole. A least-squares fit of the observed frequencies to values interpolated between and extrapolated from the predictions of a sequence of solar models with different chemical compositions selects two models. One, a helium-rich solution, agrees with that of similar analyses of whole-disk data. The extrapolated solution has a relatively deep convection zone, and is thus consistent with analyses of 5-min oscillations of high degree.
Christensen-Dalsgaard Joergen
Gough Douglas
Scherrer Philip H.
Wilcox John M.
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