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Paper: Multiperiodic Pulsations in the Be Stars NW Ser and V1446 Aql.
Volume: 361, Active OB-Stars: Laboratories For Stellar and Circumstellar Physics
Page: 84
Authors: Gutierrez-Soto, J.; Fabregat, J.; Suso, J.; Suarez, J.C.; Moya, A.; Garrido, R.; Hubert, A.; Floquet, M.; Neiner, C.; Fremat, Y.
Abstract: We present accurate differential photometry of two Be stars: NW Ser and V1446 Aql. 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, NW Ser could be one of the very few β 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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