Exploring the role of binarity in the origin of the bimodal rotational velocity distribution in stellar clusters

Many young and intermediate age massive stellar clusters host bimodal distributions in the rotation rates of their populations, with a dominant peak rapidly rotating stars secondary slow rotators. The origin this rotational distribution is currently debated two main theories have been put forward literature. first that all/most are born as rapid rotators interacting binaries brake fraction stars, resulting populations. second reflection early evolution pre-main sequence particular, whether they able to retain or lose protoplanetary discs during few Myr. Here, we test binary channel by exploiting multi-epoch VLT/MUSE observations NGC 1850, 100Myr cluster LMC, search for differences fractions fast If binarity cause bimodality, would expect slowly population should much larger than However, our data detect similar populations (5.9+/-1.1% 4.5+/-0.6%, respectively).Hence, conclude not mechanism formation observed distributions.