Magnetic storms on stars manifest as remarkable, randomly occurring changes of the
luminosity over durations that are tiny in comparison to the normal evolution of stars. These …

The first flare on the Sun was observed exactly 150 years ago. During most of the long
history, only secondary effects have been noticed, so flares remained a riddle. Now the …

The CARMENES radial velocity (RV) survey is observing 324 M dwarfs to search for any
orbiting planets. In this paper, we present the survey sample by publishing one CARMENES …

We present a sample of 824 solar and late-type stars with X-ray luminosities and rotation
periods. This is used to study the relationship between rotation and stellar activity and derive …

We describe the latest release of AtomDB, version 2.0. 2, a database of atomic data and a
plasma modeling code with a focus on X-ray astronomy. This release includes several major …

Aims. We study the evolution of stellar rotation and wind properties for low-mass main-
sequence stars. Our aim is to use rotational evolution models to constrain the mass loss …

Aims. The main goal of this work is to measure rotation periods of the M-type dwarf stars
being observed by the CARMENES exoplanet survey to help distinguish radial-velocity …

Non-degenerate stars of essentially all spectral classes are soft X-ray sources. Their X-ray
spectra have been important in constraining physical processes that heat plasma in stellar …

The Sun's magnetic activity has steadily declined during its main-sequence life. While the
solar photospheric luminosity was about 30% lower 4.6 Gyr ago when the Sun arrived on …

Aims. Knowledge of rotation periods (P rot) is important for understanding the magnetic
activity and angular momentum evolution of late-type stars, as well as for evaluating radial …