Rotation matters for the life of a star. It causes a multitude of dynamical phenomena in the
stellar interior during a star's evolution, and its effects accumulate until the star dies. All stars …

In light of substantial new discoveries of hot subdwarfs by ongoing spectroscopic surveys
and the availability of the Gaia mission Early Data Release 3 (EDR3), we compiled new …

We report on the spectroscopic confirmation of 68 new bright (G= 13.5–17.2 mag) and blue
(pre-) white dwarfs (WDs). This finding has allowed us to almost double the number of the …

Hot subdwarf stars represent a late and peculiar stage in the evolution of low-mass stars,
since they are likely formed by close binary interactions. In this work, we perform a radial …

Magnetic fields can play an important role in stellar evolution. Among white dwarfs, the most
common stellar remnant, the fraction of magnetic systems is more than 20 per cent. The …

Hot subdwarf stars are mostly stripped red giants that can exhibit photometric variations due
to stellar pulsations, eclipses, the reflection effect, ellipsoidal modulation, and Doppler …

We present an analysis of oscillation mode variability in the hot B subdwarf star EPIC
220422705, a new pulsator discovered from∼ 78 days of K2 photometry. The high-quality …

Helium-rich hot subdwarf stars of spectral type O (He-sdO) are considered prime candidates
for stellar merger remnants. Such events should lead to the generation of strong magnetic …

Stellar flares are critical phenomena on stellar surfaces, which are closely tied to stellar
magnetism. While extensively studied in main-sequence (MS) stars, their occurrence in …

Hot subdwarf stars of spectral types O and B (sdO/B) represent late stages of stellar
evolution. They are located close to the hot end of the horizontal branch, and most of them …