Monthly Notices of the Royal Astronomical Society, Volumes 105-106

absorption accretion angular momentum aperture approximately Astronomical Society atoms average binary systems bright British Astronomical Association calculated Cambridge cent centre clusters components condensation constant convection coronal lines curve density determined discussion disk distance distribution Eddington effect electrons emission encounter energy equation equilibrium errors exposures formula Galaxy given gives globular clusters hydrogen intensity International Astronomical Union internebular material interstellar hydrogen interstellar material ionization latitude luminosity magnetic field magneto-hydrodynamic magnitude mass mean measured Monthly Notices motion nebula Newall Nova Observatory observed obtained orbit outer paper parallax parsecs particles peculiar velocities photographic photographic magnitudes physical plane plates present problem prominence proper motions quartic equation radiation radiative radius reduced region relative rotation Royal Schmidt camera Section shown solar spectra spectral types spectrum stars stellar Sun's sunspot surface Table telescope temperature theory transitions turbulent velocity whirl