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Category Archives: Publications
Detection of solar-like oscillations in relics of the Milky Way: asteroseismology of K giants in M4 using data from the NASA K2 mission
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Statistics of the two-point cross-covariance function of solar oscillations
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On the contribution of sunspots to the observed frequency shifts of solar acoustic modes
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Measuring the extent of convective cores in low-mass stars using Kepler data: towards a calibration of core overshooting
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The first decade of RR Lyrae space photometric observations
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The unique dynamical system underlying RR Lyrae pulsations
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Target selection of classical pulsating variables for space-based photometry
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Population synthesis of RR Lyrae stars in the original Kepler and K2 fields of view
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Magnetic variability in the young solar analog KIC 10644253
Journal. Astronomy & Astrophysics
Abstract. The continuous photometric observations collected by the Kepler satellite over 4 years provide a whelm of data with an unequalled quantity and quality for the study of stellar evolution of more than 200 000 stars. Moreover, the length of the dataset provide a unique source of information to detect magnetic activity and associated temporal variability in the acoustic oscillations. In this regards, the Kepler mission was awaited with great expectation. The search for the signature of magnetic activity variability in solar-like pulsations still remained unfruitful more than 2 years after the end of the nominal mission. Here, however, we report the discovery of temporal variability in the low-degree acoustic frequencies of the young (1 Gyr-old) solar analog KIC 10644253 with a modulation of about 1.5 years with significant temporal variations along the duration of the Kepler observations. The variations are in agreement with the derived photometric activity. The frequency shifts extracted for KIC 10644253 are shown to result from the same physical mechanisms involved in the inner sub-surface layers as in the Sun. In parallel, a detailed spectroscopic analysis of KIC 10644253 is performed based on complementary ground-based, high-resolution observations collected by the Hermes instrument mounted on the mercator telescope. Its lithium abundance and chromospheric activity S-index confirm that KIC 10644253 is a young and more active star than the Sun.
Links. MNRAS, NASA ADS, arXiv