We report discovery of a bright, nearby () Sun-like star orbiting a dark object. We identified
the system as a black hole candidate via its astrometric orbital solution from the Gaia …

EW-type eclipsing binaries (hereafter called EWs) are strong interacting systems in which
both component stars usually fill their critical Roche lobes and share a common envelope …

Context. HR 6819 was recently proposed to be a triple system consisting of an inner B-type
giant plus black hole (BH) binary with an orbital period of 40 d and an outer Be tertiary. This …

Cyclic period changes are a fairly common phenomenon in close binary systems and are
usually explained as being caused either by the magnetic activity of one or both components …

ABSTRACT V375 Cassiopeia (V375 Cas) is an early B-type close binary with an orbital
period of 1.4734273 d. Based on high-quality and continuous light curves from the …

We present new photometric data and LAMOST spectra for the W UMa binaries UV Lyn,
V781 Tau, NSVS 4484038, and 2MASS J15471055+ 5302107. The orbital and starspot …

While the number of stellar-mass black holes detected in X-rays or as gravitational wave
sources is steadily increasing, the known population remains orders of magnitude smaller …

Analysis of timing variation of the eclipsing binary RR Dra implies the existence of an
additional object with mass of no less than 3.5 (±0.2) M⊙. This third object is orbiting around …

New spectrometric data on V Pup are combined with satellite photometry [HIPPARCOS and
recent Transiting Exoplanet Survey Satellite (TESS)] to allow a revision of the absolute …

Algol-type binaries (Algols) have aroused extensive interests due to the idiosyncratic
evolutionary stages of both components. To better understand the evolutionary properties of …