We further explore nondimensional relationships between the magnetic dynamo cycle
period P cyc, the rotational period P rot, the activity level (as observed in Ca II HK), and other …

Orbital period changes of eight W-type contact binaries (TY Boo, BH Cas, AD Cnc, TX Cnc,
RZ Com, LS Del, BB Peg and AA UMa) are presented based on the analysis of their O–C …

Using 27 sets of new multiband photometry light curves acquired from our long-term
photometric campaign carried out in the last 5 yr and high-resolution spectroscopic data …

This is the first of a series of four papers, the goal of which is to identify the overcontact
eclipsing binary star systems for which a solid case can be made for mass exchange. To …

We present the R-and V-band CCD photometry and Hα line studies of an overcontact binary
ASAS J083241+ 2332.4. The light curves exhibit totality along with a trace of the O'Connell …

Dynamo activity in stars of different types is expected to generate magnetic fields with
different characteristics. As a result, a differential study of the characteristics of magnetic …

We investigated the statistical properties of both cool and hot starspots in eclipsing binary
stars. The starspot and binary parameters for contact and semi-detached systems were …

The effects of starspots on the O–C diagrams of eclipsing binaries are investigated, with a
special emphasis on contact binaries. It is shown that starspots modulate the O–C …

Aims. We detected tertiary components of close binaries from spectroscopy and light curve
modelling, investigated the light-travel time effect and the possibility of magnetic activity …

High-precision light curves were extracted from TESScut images. Together with APOGEE
and LAMOST medium-resolution spectra, a joint study was made for six early K-type contact …