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Luminous blue variables (LBVs) are suprisingly isolated from the massiveO-type stars that are their putative progenitors in single-star evolution,implicating LBVs as binary evolution products. Aadland et al. (A19) found thatLBVs are, however, only marginally more dispersed than a photometricallyselected sample of bright blue stars (BBS) in the LMC, leading them to suggestthat LBV environments may not exclude a single-star origin. In bothcomparisons, LBVs have the same median separation, confirming that anyincompleteness in the O-star sample does not fabricate LBV isolation. Instead,the relative difference arises because the photometric BBS sample is far moredispersed than known O-type stars. Evidence suggests that the large BBSseparation arises because it traces less massive (~20 Msun), aging bluesupergiants. Although photometric criteria used by A19 aimed to select only themost massive unevolved stars, visual-wavelength color selection cannot avoidcontamination because O and early B stars have almost the same intrinsic color.Spectral types confirm that the BBS sample contains many B supergiants.Moreover, the observed BBS separation distribution matches that ofspectroscopically confirmed early B supergiants, not O-type stars, and matchespredictions for a ~10 Myr population, not a 3-4 Myr population. A broaderimplication for ages of stellar populations is that bright blue stars are not agood tracer of the youngest massive O-type stars. Bright blue stars in nearbygalaxies (and unresolved blue light in distant galaxies) generally traceevolved blue supergiants akin to SN 1987A's progenitor.

The isolation of Luminous Blue Variables resembles aging B-type supergiants, not the most massive unevolved stars