Projects

Stars born with more than eight times the mass of the Sun contribute significantly to the energetic and chemical evolution of galaxies. Born with convective cores in which they produce new elements through consecutive nuclear fusion cycles, they ultimately collapse leading to potential supernovae and compact objects such as neutron stars and black holes. During the course of their life they are affected by stellar winds, ...

he aim is to perform the asteroseismological modeling of stars with masses above about 1.3 times the mass of the Sun and up to about 40 solar masses, which has so far been done based on high-precision time series collected with NASA Kepler (past) and TESS (operational) satellites, to improve with additional measurements. Asteroseismological modeling is a high-dimensional mathematical problem in computational astrophysics where spectroscopic ...

In this project we will develop new theoretical insights from nonlinear asteroseismology and the inclusion of magnetic fields in linear asteroseismology. Our main aims are to exploit the observed combination frequencies and amplitudes detected in the light curves of B stars measured by the NASA Kepler space telescope and to exploit deviations from regular (period spacing) patterns caused by a magnetic field ...

Stellar variability studies have recently undergone immense boosts thanks to recent photometric surveys done with ground-based telescopes and with the CoRoT and Kepler space telescopes. This wealth of data led to huge progress in the understanding and improving of the theory of stellar structure and evolution, mainly thanks to asteroseismic applications. Unfortunately, some crucial phases in the life of stars could not or only hardly be ...

The study of stars forms the basis of many research fields in astrophysics, from exoplanet systems to the formation and evolution of galaxies. Stars are the chemical factories of the Universe, responsible for the production of heavier elements in their cores throughout their evolution. These resulting products of the internal nucleosynthesis are fed back to the interstellar medium through stellar winds, which chemically enrich the ...

Observations of oscillations on the solar and stellar surfaces have emerged as a unique and extremely powerful tool to gain information on, and understanding of, the processes in the Sun and stars, and the origin of the variability in the solar and stellar output.

Through helio- and asteroseismology detailed inferences of the internal structure and rotation of the Sun, and extensive information on the properties of a broad range of ...

Modelling stars with convective cores is rather difficult due to the many unknown sources of chemical element and angular momentum transport in their interior. This has consequences for many different fields in astronomy from the largest to the smallest scales. Our understanding of the chemical evolution of the universe through the element production of massive stars, the evolution of planetary systems and others ...