A search for new variable stars in NGC 6231

Astronomy and Astrophysics – Astrophysics

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Stars: Variables: General, Individual: Ngc 6231, Techniques: Photometric, Methods: Data Analysis

Scientific paper

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. Based on observations obtained at the Danish 1.54-m and Dutch 0.9-m telescopes at ESO (ESO applications: 60D-0148, 61D-0128 and 62H-0110).

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