2024JAVSO..52...67B

The Owl Cluster, NGC 457, is a beautiful open cluster containing the eclipsing binary V765 Cas. We present calibrated photometric measurements from images of the cluster, including light curves in three filters (Johnson B, V and Sloan SI), as well as light curves made from the ASAS-SN and TESS databases for comparison. We support the period estimate of V765 Cas as 1.715779 days, but propose its reclassification as a beta Lyrae-type binary. We model the surrounding stars of the cluster on an isochrone, yielding an estimate of the cluster's distance, age, metallicity, and reddening that matches estimates in the current literature. V765 Cas's position on the cluster isochrone suggests that it is in the process of becoming a red giant star. Lastly, we plotted several color indices of V765 Cas over the course of its period but did not find the colors of the two stars to be significantly different from each other.