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Astron. Astrophys. 345, 172-180 (1999)

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Acknowledgements

The help of skillful staffs at the Calar Alto and Kitt Peak observatories is highly appreciated. HFH thanks Rolf Kudritzki and his colleagues for their warm hospitality and encouragement during the period that this work was initiated, and for his suggestion to concentrate on the HeI [FORMULA]4713 line for searching for pulsations. We thank Mariano Méndez for drawing our attention to the minimum-entropy analysis and help. We are also grateful to the referee Alex Fullerton for his constructive comments. JAdJ acknowledges support by the Netherlands Foundation for Research in Astronomy (NFRA) with financial aid from the Netherlands Organization for Scientific Research (NWO) under project 781-71-053.

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© European Southern Observatory (ESO) 1999

Online publication: April 12, 1999
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