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A multisite photometric campaign for the Beta Cephei and eclipsing variable16 Lacertae is reported. 749 h of high-quality differential photoelectricStromgren, Johnson and Geneva time-series photometry were obtained with tentelescopes during 185 nights. After removing the pulsation contribution, anattempt was made to solve the resulting eclipse light curve by means of thecomputer program EBOP. Although a unique solution was not obtained, the rangeof solutions could be constrained by comparing computed positions of thesecondary component in the Hertzsprung-Russell diagram with evolutionarytracks.  For three high-amplitude pulsation modes, the uvy and the Geneva UBGamplitude ratios are derived and compared with the theoretical ones forspherical-harmonic degrees l <= 4. The highest degree, l = 4, is shown to beincompatible with the observations. One mode is found to be radial, one is l =1, while in the remaining case l = 2 or 3.  The present multisite observations are combined with the archival photometryin order to investigate the long-term variation of the amplitudes and phases ofthe three high-amplitude pulsation modes. The radial mode shows anon-sinusoidal variation on a time-scale of 73 yr. The l = 1 mode is a tripletwith unequal frequency spacing, giving rise to two beat-periods, 720.7 d and29.1 yr. The amplitude and phase of the l = 2 or 3 mode vary on time-scales of380.5 d and 43 yr.  The light variation of 2 And, one of the comparison stars, is discussed inthe Appendix.

monthly notices of the royal astronomical society

The 2003-4 multisite photometric campaign for the Beta Cephei and  eclipsing star 16 (EN) Lacertae with an Appendix on 2 Andromedae, the  variable comparison star