All Tables

Table 1: Summary of observing nights at the OSN. The mean accuracy of each dataset is also provided (see text for details).
Table 2: Results of the photometric study for stars in the Galactic anticentre direction. Frequencies in ${\rm c~d}^{-1}$ are shown for the Hipparcos, OSN and ASAS-3 datasets. The "-'' stands for stars for which a short-period analysis could not be performed. The "*'' stands for stars that were not observed with the instrument. The "**'' stands for stars that are saturated in the ASAS-3 database. The "var'' stands for stars showing short-term variability but not periodicity. The "no var'' stands for stars that do not show short-term variations at the detection level of the instrument. The "?'' stands for frequencies that are uncertain. For details, see text. In the last column some complementary indications and/or frequencies detected by other authors are given: (1) stars included in the ASAS-3 catalogue of variable stars (Pojmanski 2002); (2) Neiner et al. (2005); (3) Hubert & Floquet (1998); (4) Gutiérrez-Soto et al. (2007); (5) Lynds (1960); (6) Percy et al. (2002).
Table 3: Same as for Table 2, but for stars in the Galactic centre direction.
Table 4: Percentage of $\beta$ Cephei stars among the number of B stars in the same spectral range for different open clusters.
Table A.1: Studied Be stars in the Galactic anticentre direction. ID numbers and SIMBAD V magnitudes are given for each target in Cols. 1 and 2. The spectral type and ${V}~\sin i$ are gathered in Cols. 3 and 4. Comparison and check stars used for the differential photometry are given in Cols. 5 and 6. References of the spectral type and ${V}~\sin i$ are given in Col. 7. References: (1) Frémat et al. (2006); (2) Simbad database.
Table A.2: The same as for Table A.1, but for the stars in the Galactic centre direction.