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Doppler Imaging as a Test for Binary Star Formation Theories

Published online by Cambridge University Press:  13 May 2016

Klaus G. Strassmeier
Klaus G. Strassmeier*
Affiliation:
Institute for Astronomy, University of Vienna, A-1180 Vienna, Austria

Abstract

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Photospheric Doppler images for both stellar components of the double-lined spectroscopic binary V824 Ara reveal surface temperature inhomogeneities of up to 1800 K on both stars. The absolute brightness and the mass of the two stars suggest that they are very close to the main sequence – but not yet on the ZAMS – if an inclination of the orbital plane (and rotational axes) of 52° is adopted as suggested by the Doppler imaging. Since both stars are active, we solve for the inclinations of the rotation axes of both stellar components separately and emphasize that it can be used to test coplanarity predictions from binary star-formation theories. We find that the spin inclinations for the individual components of V824 Ara agree to within their uncertainties.

Type
VIII. Environments of Young Binaries - Indirect Observations
Information
Symposium - International Astronomical Union , Volume 200: The Formation of Binary Stars , 2001 , pp. 305 - 312
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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