He Rāngai Maomao, He Iti Pioke: Te Mauri o Pūheke

O(he) Stars

Spectral analyses of H-deficient post-AGB stars have shown that a small group of four extremely hot objects exists which have almost pure He absorption-line spectra in the optical. These are classified as O(He) stars. For their evolution there are two scenarios: They could be the long-sought hot successors of RCrB stars, which have not been identified up to now. If this turns out to be true, th...

] 5 O ct 1 99 9 Vortex core size in 3 He - 4 He filmswithmonolayer superfluid 4 He

The superfluid transition of He-He mixture films adsorbed on alumina powder is studied, with a He superfluid coverage near one layer. With up to 1.3 layers of He added, the transition becomes strongly broadened, indicating a linear increase in the vortex core size for He coverages below one layer. Annealing of the sample mixture at 4.2 K is found to be critically important in ensuring a homogen...

Calculations of the binding energies of weakly bound He–He–H, He–He–H− and He–H–H molecules

We searched for the existence of weakly bound He–He–H, He–He–H− and He–H– H molecules where the binding energies are expected to be of the order of degrees Kelvin. By employing the best empirical interaction between each pair of particles, we solved the Schrödinger equation for the triatomic systems using hyperspherical coordinates in the adiabatic approximation. We found no bound states for 4H...

Autoionization of He and Autodetachment of He- following Bombardment by H+, H2+, He+, and He Atoms

T Op of T He C Lass : T He I Mportance of O Rdinal R Ank

This paper examines the long-run impact of ordinal rank during primary school on productivity using comprehensive English administrative data. Identification is obtained from variation in test score distributions across cohorts and subjects, such that the same score relative to the school mean can have different ranks. Conditional on cardinal measures of achievement, being ranked highly during ...