Simultaneous uvby photometry of the δ Sct star HD 129231 E. Rodríguez, M. J. López-González, A. Rolland, V. Costa and S. F. González-Bedolla A&A, 376 2 (2001) 489-496 Published online: 15 September 2001 DOI: 10.1051/0004-6361:20010924