Welcome to Asterics !
(also known as the Asteroseismology and Stellar Dynamics group)
We are a research group at the Institute of Science and Technology Austria ISTA dedicated to studying the internal dynamics of stars, using a technique known as asteroseismology.
We are excited to share our research findings, and we invite you to join us in exploring the secrets of magnetic stellar evolution.
For more information about Astrophysics research and people at ISTA, click HERE
Latest News
28. Apr. 2025
TASC9/KASC16: Abstract submission and early registration Deadlines
2 May 2025: Deadline for contributed talk abstracts. Submit your abstract here.
26 May 2025: Early registration payment closes. Register here. Deadline for (physical) poster abstracts. Submit your abstract here.
In-person registration will be closed once the limit of 200 participants is reached. We recommend that you do not wait until the deadline to register, as the list of participants is already substantial, and we may have to close registration early.
For more details, please visit: https://tasc9-kasc16.ista.ac.at/
20. Dez. 2024
First Announcement:
TASC9/KASC16 Asteroseismic Science Consortium Workshop @Austria
This is the first announcement of the TASC9/KASC16 Workshop, taking place July 7-11 2025 at ISTA!
https://tasc9-kasc16.ista.ac.at
9. Dez. 2024
New Article! Core-to-envelope rotation in γDor stars
We show that increasing the convective core rotation with respect to the near-core rotation leads to a shift of the period of the observed dip to lower periods. In addition, the dip gets deeper and thinner as the convective core rotation increases. We demonstrate that such a signature is detectable in Kepler data, given appropriate dip parameter ranges and near-core structural properties.
31. Mai 2024
Probing magnetic field Geometries
We investigate the detectability of complex magnetic field topologies (as the ones observed at the surface of stars with a radiative envelope with spectropolarimetry) inside the radiative interior of red giants. We focus on a field composed of a combination of a dipole and a quadrupole (quadrudipole), and on an offset field. We explore the potential of probing such magnetic field topologies from a combined measurement of magnetic signatures on l = 1 and quadrupolar (l = 2) mixed mode oscillation frequencies.
29. Apr. 2024
New article in ApJ
Using general Lorentz-stress (magnetic) kernels, we investigated the potential for detectability of near-surface magnetism in a 1.3M⊙ star of super-solar metallicity as it evolves from a mid sub-giant to a late sub-giant into an RG. Based on these sensitivity kernels, we decompose an RG into three zones — deep core, H-shell, and near-surface. The sub-giants instead required decomposition into an inner core, an outer core, and a near-surface layer. Additionally, we find that for a low-frequency g-dominated dipolar mode in the presence of a typical stable magnetic field, ∼25% of the frequency shift comes from the H-shell and the remaining from deeper layers.
