Astron. Astrophys. 333, 524-530 (1998)

The search for  Scuti stars in open clusters ^*

S. Frandsen ¹ and T. Arentoft <sup>1, 2

1</sup> Institute of Physics and Astronomy, Aarhus University, Bygn. 520, DK-8000 Aarhus C, Denmark (srf@obs.aau.dk, toar@obs.aau.dk)
² University of Brussels (VUB), Pleinlaan 2, B-1050 Brussels, Belgium

Received 14 October 1996 / Accepted 9 January 1998

Abstract

In order to improve the tests of models of stellar evolution, observations giving tighter constraints on the models were initiated by the formation of an informal group STACC (Frandsen, 1992). The purpose of the group is to search for and make observations of  Scuti stars in open clusters.

This paper presents some of the results of the search, mainly for distant open clusters with a rich population of variables. Included is an announcement of a target list (Frandsen & Arentoft 1998, The Book) and four examples of new Colour-Magnitude (CM) diagrams of open clusters considered to be interesting targets. Finally, we present the fruits of extensive searching: an open cluster that contains many  Scuti stars.

Key words: ffi Scu stars: evolution stars: oscillations open clusters and associations: individual

* Based on observations made at the European Southern Observatory, La Silla, the Nordic Optical Telescope, ORM, La Palma and the IAC80, OT, Tenerife

Send offprint requests to: S. Frandsen

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Contents

• 1. Introduction
• 2. Status of search
  • 2.1. Content and purpose of The Book
• 3. New Colour-Magnitude diagrams for four target clusters
  • 3.1. Two northern clusters
    • 3.1.1. NGC 1513
    • 3.1.2. NGC 2324
  • 3.2. Two southern clusters
    • 3.2.1. NGC 2360
    • 3.2.2. NGC 2489
• 4. A successful search
• 5. Strategy for the future
  • 5.1. Locating a target
  • 5.2. Classifying the target
  • 5.3. The campaign
• 6. Conclusion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1998

Online publication: April 20, 1998
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