Clues about the scarcity of stripped-envelope stars from the evolutionary state of the sdO+Be binary system φ PerseiA. Schootemeijer, Y. Götberg, S. E. de Mink, D. Gies and E. ZapartasA&A, 615 (2018) A30DOI: https://doi.org/10.1051/0004-6361/201731194
