Twin Star Cities in Perseus: A Guide to the Gaia-Based Study of h & χ Persei

This study uses Gaia DR3 data to investigate the famous double cluster h and χ Persei, identifying hundreds of member stars and confirming both clusters share similar ages, distances, metallicities, and motions. Through structural modeling, MCMC isochrone fitting, and SED analysis, the authors show the clusters likely formed together and continue to move through the Galaxy on nearly identical orbits. Their results strongly support a common origin and future interaction.