Ewa Niemczura

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We have gathered and analyzed 1493 high-quality multicolor Geneva photometric data taken over 21 years of the B3Vstar HD 129929. We detect six frequencies, among which appear the effects of rotational splitting with a spacing of approximately 0.0121 cycles per day, which implies that the star rotates very slowly. A nonadiabatic analysis of the oscillations(More)
Hierarchical triple systems comprise a close binary and a more distant component. They are important for testing theories of star formation and of stellar evolution in the presence of nearby companions. We obtained 218 days of Kepler photometry of HD 181068 (magnitude of 7.1), supplemented by ground-based spectroscopy and interferometry, which show it to be(More)
The life of a star is dominantly determined by the physical processes in the stellar interior. Unfortunately, we still have a poor understanding of how the stellar gas mixes near the stellar core, preventing precise predictions of stellar evolution. The unknown nature of the mixing processes as well as the extent of the central mixed region is particularly(More)
Context. The ground–based campaigns on δ Sct stars revealed richer and richer frequency spectra of these opacity–driven pulsators, thanks to continuous improvements in their exploitation. It has also been suggested that the detection of a wealth of very low amplitude modes was only a matter of signal–to–noise ratio. Access to this treasure, impossible from(More)
We determined stellar parameters (T eff , [m/H], θ) and E(B− V) for all β Cephei stars observed during the IUE satellite mission. All parameters were derived by using an algorithmic procedure of fitting theoretical flux distribution (Kurucz 1996) to the IUE observations.
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