Henri Boffin – Science - Clusters

Clusters

It is thought that a large fraction of stars are born in clusters and it is thus important to study these. Because many are short-lived, one needs to study young ones. Moreover, open clusters represent likely a single population of stars that formed simultaneously and from the same chemical environment and as such provide useful means to constrain the evolution of stars and the formation and evolution of binaries. In particular, clusters allow to identify the outcome of binary evolution that are blue straggler stars. This has now become even more true with the data from Gaia, which is a real game changer.

Most recently, with Tereza Jerabkova, we identified the 800 pc long tidal tails of the Hyades star cluster, which was also the subject of an ESA press release. In this paper, we also likely discovered the epicyclic overdensities from an open star cluster.

Over the years, I have been working on several other aspects related to these issues, including uncovering a 260 pc wide, 35-Myr-old filamentary relic of star formation, finding a stellar relic filament in the Orion star-forming region, or debusking multiple populations and wide binaries in the Orion Nebula Cluster and discovering a super lithium-rich red-clump star in the open cluster Trumpler 5.

I also organised a workshop and edited a book on Ecology of Blue Straggler Stars.

Here is a list of some of my publications related to clusters: