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The color-magnitude diagrams (CMDs) of young star clusters show that,particularly at ultraviolet wavelengths, their upper main sequences (MSs)bifurcate into a sequence comprising the bulk population and a blue periphery.The spatial distribution of stars is crucial to understand the reasons forthese distinct stellar populations. This study uses high-resolution photometricdata obtained with the Hubble Space Telescope to study the spatialdistributions of the stellar populations in seven Magellanic Cloud starclusters. The cumulative radial number fractions of blue stars within fourclusters are strongly anti-correlated with those of the high-mass-ratiobinaries in the bifurcated region, with negative Pearson coefficients < -0.7.Those clusters generally are young or in an early dynamical evolutionary stage.In addition, a supporting N-body simulation suggests the increasing percentageof blue-MS stars from the cluster centers to their outskirts may be associatedwith the dissolution of soft binaries. This study provides a differentperspective to explore the MS bimodalities in young clusters and adds extrapuzzles. A more comprehensive study combined with detailed simulations isneeded in the future.

The spatial distributions of blue main-sequence stars in Magellanic Cloud star clusters