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Measurement of acoustic glitches in solar-type stars from oscillation frequencies observed by Kepler
A. Mazumdar, M. J. P. F. G. Monteiro, J. Ballot +15
For the very best and brightest asteroseismic solar-type targets observed by Kepler, the frequency precision is sufficient to determine the acoustic depths of the surface convectiv…
Magnetic activity of F stars observed by Kepler
S. Mathur, R. A. Garcia, J. Ballot +6
The study of stellar activity is important because it can provide new constraints for dynamo models, when combined with surface rotation rates and the depth of the convection zone.…
Study of KIC 8561221 observed by Kepler: an early red giant showing depressed dipolar modes
R. A. Garcia, F. Perez Hernandez, O. Benomar +23
The continuous high-precision photometric observations provided by the CoRoT and Kepler space missions have allowed us to better understand the structure and dynamics of red giants…
Investigating magnetic activity of F stars with the it Kepler mission
S. Mathur, R. A. Garcia, J. Ballot +6
The dynamo process is believed to drive the magnetic activity of stars like the Sun that have an outer convection zone. Large spectroscopic surveys showed that there is a relation…
On the line profile changes observed during the X2.2 class flare in the active region NOAA 11158
A. Raja Bayanna, Brajesh Kumar, P. Venkatakrishnan +4
The solar active region NOAA 11158 produced a series of flares during its passage through the solar disk. The first major flare (of class X2.2) of the current solar cycle occurred…
Period-luminosity relations in evolved red giants explained by solar-like oscillations
B. Mosser, W. A. Dziembowski, K. Belkacem +8
Solar-like oscillations in red giants have been investigated with CoRoT and Kepler, while pulsations in more evolved M giants have been studied with ground-based microlensing surve…
Differential asteroseismic study of seismic twins observed by CoRoT; Comparison of HD 175272 with HD 181420
N. Ozel, B. Mosser, M. A. Dupret +12
The CoRoT short asteroseismic runs give us the opportunity to observe a large variety of late-type stars through their solar-like oscillations. We report the observation and modeli…
Kepler White Paper: Asteroseismology of Solar-Like Oscillators in a 2-Wheel Mission
W. J Chaplin, H. Kjeldsen, J. Christensen-Dalsgaard +53
We comment on the potential for continuing asteroseismology of solar-type and red-giant stars in a 2-wheel Kepler Mission. Our main conclusion is that by targeting stars in the ecl…
Seismic constraints on rotation of Sun-like star and mass of exoplanet
Laurent Gizon, Jérome Ballot, Eric Michel +32
Rotation is thought to drive cyclic magnetic activity in the Sun and Sun-like stars. Stellar dynamos, however, are poorly understood owing to the scarcity of observations of rotati…
Oscillations and Surface Rotation of Red Giant Stars
Christina Hedges, Savita Mathur, Michael J. Thompson +1
More than 15000 red giants observed by Kepler for a duration of almost one year became public at the beginning of this year. We analysed a subsample of 416 stars to determine the g…
Measuring reliable surface rotation rates from Kepler photometric observations
R. A. Garcia, T. Ceillier, S. Mathur +1
High-quality time series provided by space instrumentation such as CoRoT and Kepler, allow us to measure modulations in the light curves due to changes in the surface of stars rela…
The Sun-as-a-star observations: GOLF & VIRGO on SoHO, and BiSON network
R. A. Garcia, G. R. Davies, A. Jimenez +7
Sun-as-a-star observations are very important for the study of the conditions within the Sun and in particular for the deep interior where higher degree modes do not penetrate. The…
Towards solar activity maximum 24 as seen by GOLF and VIRGO/SPM instruments
R. A. Garcia, D. Salabert, S. Mathur +5
All p-mode parameters vary with time as a response to the changes induced by the cyclic behavior of solar magnetic activity. After the unusual long solar-activity minimum between c…