High precision photometry and spectroscopy of low–mass stars reveal a variety of properties standard stellar evolution cannot predict. Rotation, an essential ingredient of stellar evolution, is a step towards resolving the discrepancy between model predictions and observations. The first rotating stellar model, continuously tracing a low–mass star from the pre–main sequence onto the horizontal ...

In this review, we summarize the observed statistical properties of visual binaries in various young stellar clusters. The binary frequency, orbital period distribution and mass ratio distribution are considered for populations of both low-mass and high-mass stars. These properties are then compared to numerical models of the dynamical evolution of stellar clusters and to the predictions of bin...

The LIGO and Virgo detectors have directly observed gravitational waves from mergers of pairs stellar-mass black holes, along with a smaller number involving neutron stars. These observations raise the hope that compact object could be used as probe stellar binary evolution, perhaps dynamics. This colloquium-style article summarises existing observations, describes theoretical predictions for f...

We compare models of line-driven winds from accretion discs and single spherical stars. We look at the problem of scaling mass-loss rates and velocities of stellar and disc winds with model parameters. We find that stellar and disc winds driven by radiation, within the CAK framework, are very similar as far as mass-loss rates and velocities are concerned. Thus we can use analytic results for st...