Showing papers in "Monthly Notices of the Royal Astronomical Society in 1974"
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TL;DR: The existence of galaxies indicates that the early universe must have been inhomogeneous and might have been highly chaotic as discussed by the authors, which could have lead to regions of the size of the particle horizon undergoing gravitational collapse to produce black holes with initial masses from 10-5 g upwards.
Abstract: The existence of galaxies indicates that the early universe must have been inhomogeneous and might have been highly chaotic. This could have lead to regions of the size of the particle horizon undergoing gravitational collapse to produce black holes with initial masses from 10-5 g upwards. Radiation pressure in the early Universe would cause these black holes to grow by accretion. However, despite previous expectations, this accretion would not be very much unless the initial conditions of the Universe were arranged in a special and a causal manner. Observations indicate that, at the most, only a small fraction of the matter in the early Universe can have undergone gravitational collapse.
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TL;DR: In this paper, a study of slowly rotating homogeneous masses in which the energy density E is a constant was conducted, and the structure of such configurations was determined with the aid of equations derived by Hartle in the exact framework of general relativity.
Abstract: The present paper is devoted to a study of slowly rotating homogeneous masses in which the energy density E is a constant. The structure of such configurations is determined with the aid of equations derived by Hartle in the exact framework of general relativity. These configurations have a natural limit in that the static, non-rotating, configurations must have radii (R) exceeding 9/8 times the Schwarzschild radius (R s ). The derived structures, for varying R/R s , are illustrated by a series of graphs. A result of particular interest which emerges is that the ellipticity of the configuration, for varying radius but constant mass and angular momentum, exhibits a very pronounced maximum at R/R s ~2.4.
TL;DR: An infrared photometric survey of 89 RW Aur type variables in both hemispheres has been made as mentioned in this paper, where the greatest infrared excesses are found for A and F stars while young variable B stars usually show no excesses.
Abstract: An infrared photometric survey of 89 RW Aur type variables in both hemispheres has been made. JHKL magnitudes and colors are listed. The RW Aur variables include a small number of highly reddened late-type stars. All T Tauri and hot Orion population stars show infrared excesses and the infrared properties mark certain field stars as being young. The greatest infrared excesses are found for A and F stars while young variable B stars usually show no excesses. The location of the RW Aur stars in the two-color H-K, K-L diagram favor dust re-radiation over free-free emission as the mechanism responsible for the infrared excess. A weak correlation of H-K with emission class links the occurrence of circumstellar dust and gas shells.