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The formation of massive stars is a highly complex process in which it is not clear whether the star-forming gas is in global… Expand We constrain the properties of massive binaries by comparing radial velocity data on early-type stars in Cygnus OB2 with the… Expand The hard state of X-ray binaries (XRBs) is characterized by a power-law spectrum in the X-ray band and a flat/inverted radio/IR… Expand We present the detection of a radio-emitting jet from the black hole candidate and X-ray binary source Cygnus X-1. Evidence of a… Expand The hard X-rays in Cyg X-1 and similar black hole sources are possibly produced in an active corona atop an accretion disk. We… Expand We present U, B and V light curves (taken from the literature) of the low-mass X-ray binary Cygnus X-2. We show that the most… Expand Absorption lines of have been detected in the spectra of two infrared sources in the Galactic H 3 center and also toward the… Expand We report the results from our timing analysis of 15 Rossi X-Ray Timing Explorer observations of Cygnus X-1 throughout its 1996… Expand The X-ray binary system Cygnus X-3 is a source of particular interest. As well as emitting X rays which are modulated with a 4.8… Expand WE have reported1 that the spectrum, colours and interstellar features in the star HD 226868, which is coincident with the X-ray… Expand