Double periodic variable V4142 Sgr: A key to approaching the stellar dynamo J. A. Rosales, J. Petrović, R. E. Mennickent, D. R. G. Schleicher, G. Djurašević and N. W. C. Leigh A&A, 689 (2024) A154 Published online: 09 September 2024 DOI: 10.1051/0004-6361/202348290