PG 1618+563B: A new bright pulsating sdB star
The results of two runs of time-series photometry made at the Nordic Optical Telescope clearly show that the sdB star PG 1618+563B is a new member of the EC 14026 class of sdB pulsators. Its power spectrum shows a doublet of frequencies at about 6.95 and 7.18 mHz (P ~ 144 and 139 s respectively), which produce a modulation effect in the light curve
Silvotti, R. et al.
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2000