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We analysed ASAS-3 photometry of bright early-type stars with the goal offinding new Beta Cephei stars. We were particularly interested in stars thatwould be good for seismic analysis, i.e., stars that (i) have a large number ofexcited modes, (ii) show rotationally split modes, (iii) are components ofeclipsing binary systems, (iv) have low-frequency modes, that is, are hybridBeta Cephei/SPB stars. Our study was made with a homogeneous sample of over4100 stars having MK spectral type B5 or earlier. For these stars, the ASAS-3photometry was analysed by means of a Fourier periodogram. We have discovered103 Beta Cephei stars, nearly doubling the number of previously known stars ofthis type. Among these stars, four are components of eclipsing binaries, sevenhave modes equidistant or nearly equidistant in frequency. In addition, wefound five Beta Cephei stars that show low-frequency periodic variations, verylikely due to pulsations. We therefore regard them as candidate hybrid BetaCephei/SPB pulsators. All these stars are potentially very useful for seismicmodeling. Moreover, we found Beta Cephei-type pulsations in three late O-typestars and fast period changes in one, HD 168050.

Beta Cephei stars in the ASAS-3 data. II. 103 new Beta Cephei stars and a discussion of low-frequency modes