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Article Contents
1 Introduction
2 Spectral observations and data reduction
3 Radial velocities and orbital elements
4 Atmospheric parameters of the components and the ratio of luminosities
5 Synchronization of rotation, age and mass of HD 153720 
6 Abundance analysis
7 Normal A stars are rare
8 Conclusion
Online Material

List of tables
List of figures

Copyright ESO 2004
Published by EDP Sciences