The Villafranca project: Combining Gaia and ground-based surveys to study Galactic OB groups

J. Maíz Apellániz, R. H. Barbá, J. A. Molina Lera +2

The Villafranca project is studying Galactic stellar groups with OB stars combining information from $Gaia$ and ground-based surveys. We summarize the status of the project and we…