Using the Hubble Space Telescope (HST), Italian astronomers have observed five blue straggler stars in the globular cluster 47 Tucanae. Their results show that one of these stars has a white dwarf companion. The discovery is presented in a paper published Aug. 28 on the arXiv preprint server.



Summary

Hubble Space Telescope observations have revealed a white dwarf companion to a blue straggler star in the globular cluster 47 Tucanae. Italian astronomers made this discovery while studying five blue stragglers in the cluster. Their research, detailed in a paper published on arXiv, adds to our understanding of these peculiar stars. Blue stragglers, which appear younger and bluer than other stars in their cluster, likely form through stellar mergers or mass transfer from a companion star, like this newly identified white dwarf pairing.

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