170 citations · 2.2k across the 102 of their papers we have counts for
9 papers · 1 filter
PEPSI deep spectra. III. A chemical analysis of the ancient planet-host star Kepler-444
C. E. Mack, K. G. Strassmeier, I. Ilyin +3
We obtained an LBT/PEPSI spectrum with very high resolution and high signal-to-noise ratio (S/N) of the K0V host Kepler-444, which is known to host 5 sub-Earth size rocky planets.…
PEPSI deep spectra. II. Gaia benchmark stars and other M-K standards
K. G. Strassmeier, I. Ilyin, M. Weber
We provide a homogeneous library of high-resolution, high-S/N spectra for 48 bright AFGKM stars, some of them approaching the quality of solar-flux spectra. Our sample includes the…
PEPSI deep spectra. I. The Sun-as-a-star
K. G. Strassmeier, I. Ilyin, M. Steffen
As part of the first Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) key-science project, we aim to provide well-exposed (viz. deep) high-resolution spectra of re…
Rotation--differential rotation relationships for late-type single and binary stars from Doppler imaging
Zs. Kővári, K. Oláh, L. Kriskovics +3
From our sample of spotted late-type stars showing surface differential rotation we find that the relationship between the rotation period and the surface shear coefficient $α=ΔΩ/Ω…
Antisolar differential rotation with surface lithium enrichment on the single K-giant V1192 Orionis
Zs. Kővári, K. G. Strassmeier, T. A. Carroll +7
Context: Stars with about 12 solar masses at the red giant branch (RGB) represent an intriguing period of stellar evolution, i.e. when the convective envelope interacts with the…
3D simulations of rising magnetic flux tubes in a compressible rotating interior: The effect of magnetic tension
Yori Fournier, Rainer Arlt, Udo Ziegler +1
Context: Long-term variability in solar cycles represents a challenging constraint for theoretical models. Mean-field Babcock-Leighton dynamos that consider non-instantaneous risin…