BCD spectrophotometry for massive stars in transition phases Y. J. Aidelman, M. Borges Fernandes, L. S. Cidale, A. Smith Castelli, M. L. Arias, J. Zorec, M. Kraus, A. Torres, T. B. Souza and Y. R. Cochetti A&A, 678 (2023) A21 Published online: 29 September 2023 DOI: 10.1051/0004-6361/202244938