IC 342 is a nearby, late-type spiral galaxy with a young nuclear star cluster surrounded by several giant molecular clouds. The IC 342 nuclear region is similar to the Milky Way and therefore… Expand

We present a comprehensive description of the theory and practice of opacity calculations from the infrared to the ultraviolet needed to generate models of the atmospheres of brown dwarfs and… Expand

A revised and updated annotated bibliography on atomic transition probabilities covering the literature from 1914 through October 1977 is presented and is divided into four main sections, with each article assigned a number.Expand

The Coulomb approximation (CA) has long been regarded as a useful tool for rapid estimates of line strengths, absorption oscillator strengths, and spontaneous transition probabilities of the lighter… Expand

We report the results of observations and analyses of 41 hydrogen radio recombination lines from the Orion nebula (M42) at 5.5 to 6.5 GHz, with a spectral sensitivity (channel-to-channel standard… Expand

On the basis of the original definition and analysis of the vector operator by Pauli (1926 Z. Phys. 336–63), and further developments by Flamand (1966 J. Math. Phys. 7 1924–31), and by Becker and… Expand

As a sequel to an earlier study (Hey 2009 J. Phys. B: At. Mol. Opt. Phys. 42 125701), we consider further the application of the line strength formula derived by Watson (2006 J. Phys. B: At. Mol.… Expand