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Time-series analysis of the O4 supergiant ζ Puppis

Published online by Cambridge University Press:  26 May 2016

Andy Reid
Andy Reid*
Affiliation:
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom

Abstract

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Preliminary results of a time-series analysis on a sequence of high dispersion, high-signal-to-noise, optical echelle spectra of the O4 supergiant, ζ Puppis (HD 66811), are presented. Lines of Hei λ5876Å, Heii λ5411Å, Niv λ6381Å and Civ λλ5801, 5812Å are analysed; they show variations in line shape and equivalent width, with ‘bumps’ and ‘dips’ seen moving from blue to red within the line profile. The qualitative pattern of variability seen in all these lines is similar.

A Fourier technique, incorporating the iterative clean algorithm, was used on the individual wavelength samples. A periodicity of 8.5-hrs was detected in Heii, and strongly suspected in the remaining absorption lines. This periodicity seems to rule out wind variability as the principal origin for the optical line profile variations seen in ζ Puppis.

Type
1. Pulsation and Rotation
Information
Symposium - International Astronomical Union , Volume 162: Pulsation, Rotation and Mass Loss in Early-Type Stars , 1994 , pp. 112 - 113
Copyright
Copyright © Kluwer 1994 

References

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