1999A&A...348..553P

NW Ser is a bright (V=6.1-6.2mag), active Be star which is known to vary photometrically on a time scale of hours to days. Using both Hipparcos and ground-based photometry, and using light curve, autocorrelation, power spectrum analysis and phase dispersion minimalization techniques, we have concluded that the period is close to 0.46d - a period typical of stars of this type, and in good agreement with the value of 0.488d, recently determined by Hubert & Floquet (1998A&A...335..565H) from Hipparcos data. It is possible that the period is near twice this value, but the evidence is not strong. We also find a period of about 5.5d from both the ground-based and Hipparcos data.