We are undertaking an ambitious proper motion survey of massive stars in the 30 Doradus region of the Large Magellanic Cloud using the unique capabilities of...
HVC's Favouring Star Forming Processes in galaxy discs: a basic calculation and some recent HI observations
Indirect evidence from detailed chemical evolution studies shows that infall of low metallicity gas appears to have proceeded at a rather constant rate during...
Hybrid instrument for turbulence detection: wavefront sensing and scintillation detection in a fully automatic device
In the planning stage of extremely large telescopes, site testing and study of high performance adaptive optics systems plays very important roles. Site testing...
Hydrodynamical simulations of Multiple Shell Planetary Nebulae
We present hydrodynamical simulations of multiple shell planetary nebulae (MSPN) formation using evolutionary models of 1, 1.5, 2, 2.5, 3.5 and 5 M_odot...
New spectra of A78 and A58 at different positions in the nebulae are presented. An abundance gradient is found in A78, extending quite close to the center...
We identify candidate hypervelocity stars from the Sloan Extension for Galactic Understanding and Exploration (SEGUE) G and K dwarf samples. Previous searches...
H_α luminosities of a sample of galaxies in nearby compact groups are presented. Our purpose is to study the influence of the group environment on the star...
Hα emission line sources from IPHAS (Witham+, 2008)
We present IPHAS positions and photometry for 4853 sources selected as having a Hα excess from the photometry. The catalogue covers the magnitude range 13