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- W1584367675 abstract "The variations in the atmospheric parameters thetaatsub effat, log gatsub effat, log n/sub e/, and log H (scale height) over the surface of the peculiar magnetic stars ..cap alpha../sup 2/ CVn and HD 184905 are determined. The values of thetaatsub effat and log gatsub effat are obtained both from the equivalent width of the H..gamma.. and Hdelta lines, and by comparing theoretical profiles with those measured on spectrograms. In both stars the log gatsub effat variations with phase exhibit two maxima with sizable amplitudes: approx. =0.8 for ..cap alpha../sup 2/ CVn and approx. =0.6 for HD 184905. Tatsub effat varies over the surface of the two stars with amplitudes of approx. =1100/sup 0/K and 650--700/sup 0/K, respectively (the error is 150--200/sup 0/K). For ..cap alpha../sup 2/ CVn, the extrema of thetaatsub effat and the corresponding log gatsub effat values indicate the presence on the surface of hot, dense and of cool, rarefied portions of the atmosphere, matching two ''spots'' of iron-peak elements. Minimum H values correspond to maximum log gatsub effat. The optical depths tauatsub lambdaat where various parts of the hydrogen-line profiles are formed are estimated by the same method as thetaatsub effat and log gatsub effat. The depthsmore » tauatsub lambdaat vary with phase, more strongly near the center of the line than in the wings. All these variations suggest that the structure of the atmosphere of each star is nonuniform. A second axis of symmetry is confirmed for ..cap alpha../sup 2/ CVn; it forms a 30/sup 0/ angle with the magnetic axis.« less" @default.
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- W1584367675 date "1978-11-01" @default.
- W1584367675 modified "2023-09-26" @default.
- W1584367675 title "Hydrogen lines and atmospheric parameters of the magnetic variables. cap alpha. /sup 2/ Canum Venaticorum and HD 184905" @default.
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