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

@article{Aerts2018K2PA,
  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},
  year={2018},
  volume={476},
  pages={1234-1241}
}
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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References

SHOWING 1-10 OF 38 REFERENCES

BRITE-Constellation High-Precision Time-Dependent Photometry of the Early O-Type Supergiant ζ Puppis Unveils the Photospheric Drivers of Its Small- and Large-Scale Wind Structures

From 5.5 months of dual-band optical photometric monitoring at the 1 mmag level, BRITE-Constellation has revealed two simultaneous types of variability in the O4I(n)fp star ζ Puppis: one single

Low-amplitude rotational modulation rather than pulsations in the CoRoT B-type supergiant HD 46769

Aims. We aim to detect and interpret photometric and spectroscopic variability of the bright CoRoT B-type supergiant target HD 46769 (V = 5:79). We also attempt to detect a magnetic field in the

Low-frequency photospheric and wind variability in the early-B supergiant HD 2905

Despite the important advances in space asteroseismology during the last decade, the early phases of evolution of stars with masses above $\sim$15 M$_{\odot}$ have been only vaguely explored up to

Periodic mass-loss episodes due to an oscillation mode with variable amplitude in the hot supergiant HD 50064

Aims. We aim to interpret the photometric and spectroscopic variability of the luminous blue variable supergiant HD 50064 ( V = 8.21). Methods. CoRoT space photometry and follow-up high-resolution

Interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198 478

Blue supergiant stars are known to display photometric and spectroscopic variability that is suggested to be linked to stellar pulsations. Pulsational activity in massive stars strongly depends on

Kepler sheds new and unprecedented light on the variability of a blue supergiant: Gravity waves in the O9.5Iab star HD 188209⋆

Stellar evolution models are most uncertain for evolved massive stars. Asteroseismology based on high-precision uninterrupted space photometry has become a new way to test the outcome of stellar

Photometry of very bright stars with Kepler and K2 smear data

High-precision time series photometry with the Kepler satellite has been crucial to our understanding both of exoplanets, and via asteroseismology, of stellar physics. After the failure of two

Asteroseismology of the nearby SN-II Progenitor: Rigel. I. The MOST High-precision Photometry and Radial Velocity Monitoring

Rigel (β Ori, B8 Ia) is a nearby blue supergiant displaying α Cyg type variability, and is one of the nearest Type II supernova progenitors. As such it is an excellent test bed to study the internal

MOST Detects g- and p-Modes in the B Supergiant HD 163899 (B2 Ib/II)

The Microvariability and Oscillations of Stars (MOST) satellite observed the B supergiant HD 163899 (B2 Ib/II) for 37 days as a guide star and detected 48 frequencies ≲2.8 cycles day-1 with

Oscillations in the Massive Wolf-Rayet Star WR 123 with the MOST Satellite

We present the results of intensive visual-broadband photometric monitoring of the highly variable WN8 Wolf-Rayet star WR 123, obtained by the MOST (Microvariability and Oscillations of STars)