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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

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