The Pre-He White Dwarf in the Post-mass Transfer Binary EL CVn
EL CVn is the prototype of a class of eclipsing binaries that consist of an A- or F-type main-sequence star and a hot, low-mass, pre-He white dwarf (pre-He WD)...
The pre-main sequence spectroscopic binary UZ Tau East: Improved orbital parameters and accretion phase dependence
We present radial-velocity measurements obtained using high- and intermediate-resolution spectroscopic observations of the classical T Tauri star UZ Tau East...
The pre-main-sequence binary HK Ori: spectro-astrometry and EXPORT data
In this paper we present multi-epoch observations of the pre-main-sequence binary HK Ori. These data have been drawn from the EXPORT data base and are...
The Present and Future of Planetary Nebula Research. A White Paper by the IAU Planetary Nebula Working Group
We present a summary of current research on planetary nebulae and their central stars, and related subjects such as atomic processes in ionized nebulae, AGB and...
The Pressure-confined Wind of the Massive and Compact Super Star Cluster M82-A1
The observed parameters of the young super star cluster M82-A1 and its associated compact H II region are here shown to indicate a low heating efficiency or...
The primordial helium abundance and the number of neutrino families
Based on observations of HII regions and on the new computations of the recombination coefficients of the HeI lines by Porter el al. we obtain a primordial...
The Principle of Maximum Entropy and the Distribution of Mass in Galaxies
We do not have a final answer to the question of why galaxies choose a particular internal mass distribution. Here we examine whether the distribution is set by...