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Radial Velocity and Magnetic Variations of a Draconis

Published online by Cambridge University Press:  12 April 2016

Holger Lehmann  and
Gerhard Scholz
Holger Lehmann
Affiliation:
Thüringer Landessternwarte, Karl-Schwarzschild-Observatorium, O-6901 Tautenburg, Germany
Gerhard Scholz
Affiliation:
Astrophysikalisches Institut Potsdam, Telegrafenberg, O-1561 Potsdam, Germany

Abstract

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Based on photographic Zeeman spectra a magnetic field has been detected for the giant star α Dra. One of the two periods derived for the magnetic changes can be interpreted as the half rotational period corresponding to a slight variation of the radial velocity of 3.57 days. The application of an eguatorially symmetric rotator model with a magnetic field dominated by the quadrupole moment leads to a good agreement with the observed magnetic variation. The orbital elements of α Dra were newly derived.

Type
VII. Photometric Variability and Evolutionary Status
Information
International Astronomical Union Colloquium , Volume 138: Peculiar versus Normal Phenomena in A-Type and Related Stars , 1993 , pp. 612 - 616
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

Adelman, S.J., Bolcal, C., Kocer, D., and Inelmen, E. 1987, Pub. A.S.P., 99, 130.Google Scholar
Adelman, S.J. 1989, Publ. A.S.P., 101, 681 Google Scholar
Deeming, T.J. 1977, Astrophys. Space Sci., 46, 13 Google Scholar
Eist, E.W., Nellea, B. 1983, Astron. Astrophys., Suppl. Ser. 53, 215 Google Scholar
Hoffleit, D. 1982, The Bright Star Catalogue (4th ed.; New Haven, CT: Yale University Observatory).Google Scholar
Oetken, L. 1977, Astron. Nachr., 298, 197 CrossRefGoogle Scholar
Slettebak, A., Collins, G.W., Boyce, P.B., White, N.M., and Parkinson, T.D. 1975, Ap. J. Suppl., 29, 137 Google Scholar