The open cluster Berkeley 53
The optical counterpart to IGR J06074+2205: a Be/X-ray binary showing disc loss and V/R variability
The optical emission nebulae in the vicinity of WR 48 (Theta Mus); True Wolf-Rayet ejecta or unconnected supernova remnant?
The Optical Gravitational Lensing Experiment. The Catalog of Stellar Proper Motions toward the Magellanic Clouds
The Optical Gravitational Lensing Experiment: Analysis of the bulge RR Lyrae population from the OGLE-III data
The optical microvariability and spectral changes of the BL Lacertae object S5 0716+714
The optical structure of the starburst galaxy M82 - I: Dynamics of the disk and inner-wind
The OPTX Project IV: How Reliable is [OIII] as a Measure of AGN Activity?
The Orbit of the Orphan Stream
The orbit of the star S2 around SgrA* from VLT and Keck data
The Orbital Period of V368 Aquilae (Nova Aquilae 1936 No. 2)
The Orbital Structure of Triaxial Galaxies with Figure Rotation
The orbits of open clusters in the Galaxy
The orientation and kinematics of inner tidal tails around dwarf galaxies orbiting the Milky Way
The orientations of molecular clouds in the outer Galaxy: Evidence for the scale of the turbulence driver ?
The Origin and Distribution of Cold Gas in the Halo of a Milky Way-Mass Galaxy
The origin and orbit of the old, metal-rich, open cluster NGC 6791: Insights from kinematics
The origin and physical mechanism of the ensemble Baldwin effect
The Origin and Shaping of Planetary Nebulae: Putting the Binary Hypothesis to the Test
The origin of an extended X-ray emission apparently associated with the globular cluster 47 Tucanae