The connection between stellar granulation and oscillation as seen by the Kepler mission

@article{Kallinger2014TheCB,
  title={The connection between stellar granulation and oscillation as seen by the Kepler mission},
  author={Thomas Kallinger and Joris De Ridder and Saskia Hekker and Savita Mathur and Beno{\^i}t Mosser and Michael Gruberbauer and R. A. Garc{\'i}a and Christoffer Karoff and J{\'e}r{\^o}me Ballot},
  journal={Astronomy and Astrophysics},
  year={2014},
  volume={570}
}
Context. The long and almost continuous observations by Kepler show clear evidence of a granulation background signal in a large sample of stars, which is interpreted as the surface manifestation of convection. It has been shown that its characteristic timescale and rms intensity fluctuation scale with the peak frequency (νmax) of the solar-like oscillations. Various attempts have been made to quantify the observed signal, to determine scaling relations for its characteristic parameters, and to… 

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References

SHOWING 1-10 OF 71 REFERENCES

Stellar granulation as seen in disk-integrated intensity. II. Theoretical scaling relations compared with observations

Context. A large set of stars observed by CoRoT and Kepler shows clear evidence for the presence of a stellar background, which is interpreted to arise from surface convection, i.e., granulation.

Stellar granulation as seen in disk-integrated intensity I. Simplified theoretical modeling

Context. Solar granulation has been known for a long time to be a surface manifestation of convection. The space-borne missions CoRoT and Kepler enable us to observe the signature of this phenomena

OBSERVATIONS OF INTENSITY FLUCTUATIONS ATTRIBUTED TO GRANULATION AND FACULAE ON SUN-LIKE STARS FROM THE KEPLER MISSION

Sun-like stars show intensity fluctuations on a number of timescales due to various physical phenomena on their surfaces. These phenomena can convincingly be studied in the frequency spectra of these

GRANULATION IN RED GIANTS: OBSERVATIONS BY THE KEPLER MISSION AND THREE-DIMENSIONAL CONVECTION SIMULATIONS

The granulation pattern that we observe on the surface of the Sun is due to hot plasma rising to the photosphere where it cools down and descends back into the interior at the edges of granules. This

EVIDENCE FOR GRANULATION IN EARLY A-TYPE STARS

Stars with spectral types earlier than about F0 on (or close) to the main sequence have long been believed to lack observable surface convection, although evolutionary models of A-type stars do

Mode lifetimes of stellar oscillations - Implications for asteroseismology

Context. Successful inference from asteroseismology relies on at least two factors: that the oscillations in the stars have amplitudes large enough to be clearly observable, and that the oscillations

Asteroseismology of red giants from the first four months of Kepler data: Fundamental stellar parameters

Context. Clear power excess in a frequency range typical for solar-type oscillations in red giants has been detected in more than 1000 stars, which have been observed during the first 138 days of the

Hydrodynamical simulations of convection-related stellar micro-variability. II. The enigmatic granul

We used a series of CO5BOLD hydrodynamical model atmospheres covering stellar objects from white dwarfs to red giants to derive theoretical estimates of the photometric and photocentric stellar

The nature of p-modes and granulation in HD 49933 observed by CoRoT

Context. Recent observations of HD 49933 by the space-photometric mission CoRoT provide photometric evidence of solar type oscillations in a star other than our Sun. The first published reduction,

The underlying physical meaning of the νmax νc relation

Asteroseismology of stars that exhibit solar-like oscillations are enjoying a growing interest with the wealth of observational results obtained with the CoRoT and Kepler missions. In this framework,
...