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

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The search for [FORMULA]  Scuti stars in open clusters *

S. Frandsen 1 and T. Arentoft 1, 2

1 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 [FORMULA]  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 [FORMULA]  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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© European Southern Observatory (ESO) 1998

Online publication: April 20, 1998
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