Abstract
High resolution imaging with HST-wfpc2 of seven of the most luminous evolved cool stars shows that the three OH/IR stars NML Cyg, VX Sgr and S Per have circumstellar nebulae while no ejecta was detected for the M-type supergiant μ Cep and the yellow hypergiants ρ Cas, HR 8752 and HR 5171a.
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