Global stellar variability study in the field-of-view of the<i>Kepler</i>satellite

Debosscher, J.; Blomme, Jonas; Aerts, C.

doi:10.1051/0004-6361/201015647

Cited by 113 publications

(122 citation statements)

References 15 publications

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“…However, our results for Mtype stars agree well with those reported by Reiners and Mohanty (2012) and McQuillan et al (2013). The study by Debosscher et al (2011) analyzed a different set of Kepler data, but we still find good agreement with the stars overlapping with our sample.…”

Section: Discussionsupporting

confidence: 91%

Differential Rotation in Sun-like Stars from Surface Variability and Asteroseismology

Nielsen

2017

Springer Theses

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Section: Discussionsupporting

confidence: 91%

Differential Rotation in Sun-like Stars from Surface Variability and Asteroseismology

Nielsen

2017

Springer Theses

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“…We compared our classification with the automated supervised classification results presented by Debosscher et al (2011). Because these authors studied public Kepler Q1 data, only 479 objects of our sample appear in their catalogue.…”

Section: Classificationmentioning

confidence: 99%

TheKeplercharacterization of the variability among A- and F-type stars

Uytterhoeven

Moya

Grigahcène

et al. 2011

A&A

321

316

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Context. The Kepler spacecraft is providing time series of photometric data with micromagnitude precision for hundreds of A-F type stars. Aims. We present a first general characterization of the pulsational behaviour of A-F type stars as observed in the Kepler light curves of a sample of 750 candidate A-F type stars, and observationally investigate the relation between γ Doradus (γ Dor), δ Scuti (δ Sct), and hybrid stars. Methods. We compile a database of physical parameters for the sample stars from the literature and new ground-based observations. We analyse the Kepler light curve of each star and extract the pulsational frequencies using different frequency analysis methods. We construct two new observables, "energy" and "efficiency", related to the driving energy of the pulsation mode and the convective efficiency of the outer convective zone, respectively. Results. We propose three main groups to describe the observed variety in pulsating A-F type stars: γ Dor, δ Sct, and hybrid stars. We assign 63% of our sample to one of the three groups, and identify the remaining part as rotationally modulated/active stars, binaries, stars of different spectral type, or stars that show no clear periodic variability. 23% of the stars (171 stars) are hybrid stars, which is a much higher fraction than what has been observed before. We characterize for the first time a large number of A-F type stars (475 stars) in terms of number of detected frequencies, frequency range, and typical pulsation amplitudes. The majority of hybrid stars show frequencies with all kinds of periodicities within the γ Dor and δ Sct range, also between 5 and 10 d −1 , which is a challenge for the current models. We find indications for the existence of δ Sct and γ Dor stars beyond the edges of the current observational instability strips. The hybrid stars occupy the entire region within the δ Sct and γ Dor instability strips and beyond. Non-variable stars seem to exist within the instability strips. The location of γ Dor and δ Sct classes in the (T eff , log g)-diagram has been extended. We investigate two newly constructed variables, "efficiency" and "energy", as a means to explore the relation between γ Dor and δ Sct stars. Conclusions. Our results suggest a revision of the current observational instability strips of δ Sct and γ Dor stars and imply an investigation of pulsation mechanisms to supplement the κ mechanism and convective blocking effect to drive hybrid pulsations. Accurate physical parameters for all stars are needed to confirm these findings.

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“…The application of these methods to the public Kepler Q1 data is described in Debosscher et al (2011). The authors paid special attention to the detection of pulsating stars in eclipsing binary systems there.…”

Section: Introductionmentioning

confidence: 99%

KIC 11285625: A double-lined spectroscopic binary with aγDoradus pulsator discovered fromKeplerspace photometry

Debosscher

Aerts

Tkachenko

et al. 2013

A&A

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Aims. We present the first binary modelling results for the pulsating, eclipsing binary KIC 11285625 that was discovered by the Kepler mission. An automated method to disentangle the pulsation spectrum and the orbital variability in high quality light curves was developed and applied. The goal was to obtain accurate orbital and component properties in combination with essential information derived from spectroscopy. Methods. A binary model for KIC 11285625 was obtained, using a combined analysis of high-quality space-based Kepler light curves and ground-based high-resolution HERMES echelle spectra. The binary model was used to separate the pulsation characteristics from the orbital variability in the Kepler light curve in an iterative way. We used an automated procedure based on the JKTEBOP binary modelling code to perform this task, and adapted codes for frequency analysis and prewhitening of periodic signals. Using a disentangling technique applied to the composite HERMES spectra, we obtained a higher signal-to-noise mean spectrum for both the primary and the secondary components. A model grid search method for fitting synthetic spectra was used for fundamental parameter determination for both components. Results. Accurate orbital and component properties of KIC 11285625 were derived, and we have obtained the pulsation spectrum of the γ Dor pulsator in the system. Detailed analysis of the pulsation spectrum revealed amplitude modulation on a timescale of a hundred days, and strong indications of frequency splittings at both the orbital frequency and the rotational frequency derived from spectroscopy.

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Global stellar variability study in the field-of-view of theKeplersatellite

Cited by 113 publications

References 15 publications

Differential Rotation in Sun-like Stars from Surface Variability and Asteroseismology

Differential Rotation in Sun-like Stars from Surface Variability and Asteroseismology

TheKeplercharacterization of the variability among A- and F-type stars

KIC 11285625: A double-lined spectroscopic binary with aγDoradus pulsator discovered fromKeplerspace photometry

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