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24. Harmonic analysis of the periodic spectrum variables

Published online by Cambridge University Press:  18 July 2016

Armin J. Deutsch
Armin J. Deutsch*
Affiliation:
Mount Wilson and Palomar Observatories, Pasadena, California, U.S.A.

Abstract

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Certain stars are known to be periodic magnetic variables, and to show synchronous changes in line strength and radial velocity. The hypothesis has been made that the atmosphere of such a star is in rigid rotation, and that it is characterized by a permanent magnetic field and associated abundance irregularities. The magnetic potential and the local equivalent widths have been developed in spherical harmonics, and the Laplace coefficients of these expansions have been related to the Fourier coefficients of the observed curves. The theory has been applied to the star HD 125248 in an attempt to verify the original hypothesis and to map the magnetic fields and abundance anomalies over the stellar atmospheres.

Type
Part III: Stellar Magnetism
Information
Symposium - International Astronomical Union , Volume 6: Electromagnetic Phenomena in Cosmical Physics , 1958 , pp. 209 - 221
Copyright
Copyright © Cambridge University Press 1958 

References

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