Context. Light and spectrum variations of the magnetic chemically peculiar (mCP) stars are
explained by the oblique rigid rotator model with a rotation period usually assumed to be …

We report a single-lined white dwarf–main-sequence binary system, LAMOST J172900. 17+
652952.8, which is discovered by the Large Sky Area Multi-Object Fibre Spectroscopic …

Context. There are 23 long-period binary systems discovered to date that contain a B-type
hot subdwarf whose orbital parameters have been fully solved. They evolve into O-type …

Context. Helium-dominated subdwarfs are core helium burning stars stripped of their
envelope. The nuclear evolution of these stars alters surface abundances. Modified …

A fraction of the extreme horizontal branch stars of globular clusters exhibit a periodic light
variability that has been attributed to rotational modulation caused by surface spots. These …

Context. The derivation of radial velocities from large numbers of spectra that typically result
from survey work, requires automation. However, except for the classical cases of slowly …

We utilize a hybrid approach that integrates the traditional cross-correlation function (CCF)
and machine learning to detect spectroscopic multiple star systems, specifically focusing on …

Context. Hot subdwarfs are helium burning objects in late stages of their evolution. These
subluminous stars can develop winds driven by light absorption in the lines of heavier …

Context. Very precise satellite photometry has revealed a large number of variable stars
whose variability is caused either by surface spots or by binarity. Detailed studies of such …

The axial rotation of a star plays an important role in its evolution, the physical conditions in
its atmosphere and the appearance of its spectrum. We analyzed the CCD spectra of two …