Building a Roadmap for Hubble science into the 2030s: Crucial UV spectroscopy of Oe stars in nearby galaxies

Hubble's unique COS G130M+G160M and STIS E140M UV spectral capabilities are essential for characterizing and understanding fundamental properties of main-sequence O-type emission-line (Oe) stars. These are fast rotators, and some are believed to be spun up in binaries. UV medium resolution observations of these stars are crucial for understanding massive binaries and their role in galaxy evolution. Oe stars are more prevalent at low metallicity, where they are highly under-studied, but UV spectra of these stars at all metallicities are needed. Observations of these stars in the 2030's with Hubble are particularly important in the era of ultra wide-field IFU optical and transient astronomy surveys. Ultimately, these observations will inform future UV observations with the Habitable Worlds Observatory.