Abstract
SPECTRAL LINE DISPLACEMENTS AT THE SUN'S LIMB.—As a further research in connection with the work carried on at the Kodaikanal Observatory on the displacement of spectrum lines at the sun's limb, Mr. A. A. Narayana Ayyar contributes to Bulletin No. 44 of the Kodaikanal Observatory the results of his work on the displacements at the sun's limb of lines sensitive to pressure and density. It is pointed out that certain lines, particularly those of calcium and sodium, are much more sensitive to pressure and density than iron lines, and that therefore the limb shifts of such lines should provide a much more rigorous test as to whether there is a large difference of pressure and density between the sun's limb and centre. The paper gives the experimental details, and the result arrived at is that the difference of pressure and density between the limb and centre is very small, a conclusion in agreement with that derived by Messrs. Evershed and Royds. The balance of evidence, as the author states, is in favour of slightly lower pressure and density at the limb than at the centre of the disc.
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