We present the results of the Gemini Deep Planet Survey, a near-infrared adaptive optics
search for giant planets and brown dwarfs around 85 nearby young stars. The observations …

Context. This paper is the last in a series devoted to the analysis of the binary content of the
Hipparcos Catalogue. Aims. The comparison of the proper motions constructed from …

A large number of direct imaging surveys for exoplanets have been performed in recent
years, yielding the first directly imaged planets and providing constraints on the prevalence …

Radio observations of stars trace the plasma conditions and magnetic field properties of
stellar magnetospheres and coronae. Depending on the plasma conditions at the emitter …

Context. Close binaries with magnetically active components are astrophysical laboratories
for studying the effects of binarity on activity. Of particular interest are binary and multiple star …

A considerable number of astrometric binaries whose positions on the sky do not obey the
standard model of mean position, parallax, and linear proper motion were observed by the …

The European Space Agency mission Gaia, to be launched in 2012, will observe millions of
binaries ranging from contact eclipsing ones to wide pairs with hundred year periods …

This paper reviews methods which can be used to detect binaries involving low‐and
intermediate‐mass stars, with special emphasis on evolved systems. Besides the traditional …

Astrometric binaries are both a gold mine and a nightmare. They are a gold mine because
they are sometimes the unique source of orbital inclination for spectroscopic binaries, thus …

We have determined the spectroscopic orbits of five γ Dor variables, HD 776, HD 6568, HD
17310, HD 19684, and HD 62196. Their orbital periods range from 27.8 to 1163 days and …