Astron. Astrophys. 346, 487-490 (1999)

The light curves of the short-period variable stars in Centauri

E. Poretti

Osservatorio Astronomico di Brera, Via Bianchi 46, I-23807 Merate, Italy (poretti@merate.mi.astro.it)

Received 12 February 1999 / Accepted 1 April 1999

Abstract

The Fourier decomposition was applied to the light curves of the short period variable stars discovered by the OGLE team (Kaluzny et al. 1996, 1997) in Cen. The progression of the parameter as a function of the period is extended toward very short periods as the new values connected directly to those of stars located in the Galaxy. However, two groups of stars deviate: the first is located around 0.038 d and it shows rather high values; the second is the origin of a small change in the slope around 0.050 d. The reality of the two features is discussed. The peculiarity of the light curve of OGLEGC 26 is also emphasized.

Key words: methods: data analysis stars: oscillations stars: variables: ffi Sct Galaxy: globular clusters: individual: ! Cen

Send offprint requests to: E. Poretti

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Contents

• 1. Introduction
• 2. Period verification and refinement
• 3. Fourier parameters
• 4. Discussion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1999

Online publication: May 21, 1999
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