Displaced Calcium Lines in the Spectrum of HD 190073.

Numerous narrow dark lines of neutral and ionized metals have been measured with a dispersion of 10 A/mm. Many, including the Dl, 2 lines of Na I, have bright edges. The chief interest centers in the intense, strongly displaced H and K lines of Ca II. Components of these lines have the following displacements (km/sec): 0, -147, -181, (-200), (-296), -323, -358, (-396). Three pairs of displacements have the ratio 2 : 1. The explanation of the displacements on the basis of motions radially outward from the surface of the star is discussed. A formal alternative explanation might lie in some atomic phenomenon which displaces by small amounts the 2 or the 2P levels in Ca II.