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Using light curves with $\sim$3 min cadence and a duration of 2 hrs madeusing the OmegaWhite survey, we present the results of a search forshort-period variable stars in the field of 20 open clusters. We identified 92variable stars in these fields. Using a range of cluster member catalogues andGaia EDR3 data, we have determined that 10 are cluster members and 2 more areprobable members. Based on their position on the Gaia HRD and their photometricperiods, we find that most of these are $\delta$ Sct stars. We obtainedlow-resolution optical spectroscopy of some of these cluster members and fieldstars. We discuss the cluster variable stars in the context of $\delta$ Sctstars in other open clusters.

The OmegaWhite Survey for Short Period Variable Stars VI. Open Clusters