We report on the discovery of a fourth component in the HD 221356 star system, previously known to be formed by an F8V, a slightly metal poor primary ([Fe/H] =...

Aims: Our aim is to identify brown dwarf members of the nearby Hyades open star cluster to determine the photometric and spectroscopic properties of brown...

A new line list for the A2Σ+ -X2 Π electronic transition of OH has been calculated. Line positions have been taken from the literature and refitted with Western...

A new linelist for the A3Π-X3Σ- electronic transition of NH has been prepared using line positions from the literature and calculated line intensities. High...

LoTr 5 is a planetary nebula with an unusual long-period binary central star. As far as we know, the pair consists of a rapidly rotating G-type star and a hot...

We present a new method based on artificial neural networks techniques aimed at determining the fraction of binary systems populating star clusters. We address...

The epoch in which galactic discs settle is a major benchmark for testing models of galaxy formation and evolution but remains largely unknown. Once discs...

GJ 9827 is a bright, nearby K7V star orbited by two super-Earths and one mini-Neptune on close-in orbits. The system was first discovered using K2 data and then...

We describe a method of determining the system parameters in non-eclipsing interacting binaries. We find that the extent to which an observer sees the shape of...