Gutiérrez-Soto, J. ; Fabregat, J. ; Suso, J. ; Suárez, J. C. ; Moya, A. ; Garrido, R. ; Hubert, A. ; Floquet, M. ; Neiner, C. ; Frémat, Y.

published in Active OB-Stars: Laboratories for Stellare and Circumstellar Physics, 361, pp. 84 (2007)

Abstract: We present accurate differential photometry of two Be stars: NWSer and V1446Aql. Both stars show rapid variations in amplitude, probably due to a beating phenomenon. The spectral analysis confirms the presence of two close frequencies. A preliminary instability analysis indicates that l=2 or l=3 g modes are predicted unstable for both stars. In addition, NWSer could be one of the very few ß Cephei and SPB hybrid star. This would be the first unambiguous ground-based detection of photometric multiperiodicity in Be stars which may constitute a proof of the presence of non-radial pulsations (nrp) as the origin of the short-term variability. Further spectroscopic and photometric observations are planned in order to confirm the detected frequencies.

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