K2 photometry and HERMES spectroscopy of the blue supergiant ρ Leo: rotational wind modulation and low-frequency waves★

  title={K2 photometry and HERMES spectroscopy of the blue supergiant $\rho$ Leo: rotational wind modulation and low-frequency waves★},
  author={Conny Aerts and Dominic M. Bowman and Sergio Sim{\'o}n-D{\'i}az and Bram Buysschaert and Cole Johnston and Ehsan Moravveji and Paul G. Beck and Peter De Cat and Santiago Andr{\'e}s Triana and Suzanne Aigrain and Nieves Castro and Daniel Huber and Timothy R. White},
  journal={Monthly Notices of the Royal Astronomical Society},
We present an 80-d long uninterrupted high-cadence K2 light curve of the B1Iab supergiant rho Leo (HD 91316), deduced with the method of halo photometry. This light curve reveals a dominant frequency of $f_{\rmrot}=0.0373$d$^{-1}$ and its harmonics. This dominant frequency corresponds with a rotation period of 26.8d and is subject to amplitude and phase modulation. The K2 photometry additionally reveals multiperiodic low-frequency variability ($<1.5 $d$^{-1}$) and is in full agreement with low… 

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