EDP Sciences
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Volume 380, Number 2, December III 2001
Page(s) 599 - 608
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20011472

A&A 380, 599-608 (2001)
DOI: 10.1051/0004-6361:20011472

A search for new variable stars in NGC 6231

T. Arentoft1, C. Sterken1, M. R. Knudsen1, L. M. Freyhammer1, 2, H. W. Duerbeck1, E. Pompei3, C. E. Delahodde3 and J. W. Clasen4

1  University of Brussels (VUB), Pleinlaan 2, 1050 Brussels, Belgium
2  Royal Observatory of Belgium, Ringlaan 3, 1180 Brussels, Belgium
3  European Southern Observatory, Alonso de Cordova 3107, Santiago, Chile
4  Nordic Optical Telescope, Apartado 474, 38700 Santa Cruz de La Palma, Canary Islands, Spain

(Received 27 September 2001 / Accepted 15 October 2001)

NGC 6231 is a well-studied young open cluster hosting several variable stars. In the field six $\beta$ Cephei stars, several eclipsing binaries and one $\delta$ Scuti star are known (as well as a foreground $\delta$ Scuti star). In an ongoing effort to map and study the variability in NGC 6231, we present new results based on CCD time-series data optimised for the bright $\beta$ Cephei stars as well as data optimised for much fainter stars. We detect 17 new variable stars in the cluster, including three $\delta$ Scuti stars, three $\gamma$ Doradus candidates, three Slowly Pulsating B star candidates and one, or possibly two, new $\beta$ Cephei stars.

Key words: stars: variables: general -- individual: NGC 6231 - techniques: photometric -- methods: data analysis

Offprint request: T. Arentoft, tarentof@vub.ac.be

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© ESO 2001