Astronomy and cosmogony by James Hopwood Jeans

By James Hopwood Jeans

This moment version, initially released in 1929, is an intensive survey on the leading edge of cosmology and astronomy with specific connection with the actual country of subject, the constitution, composition and life-cycle of stars, and the superstructures of nebulae and galaxies. meant as a rigourously argued clinical treatise, each attempt was once made by means of denims to render the result of far-reaching developments in cosmology intelligible to a huge variety of readers.

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The frequency with which the different classes of binary stars figure in star catalogues gives a very misleading idea as to the frequencies with which the stars themselves occur in space. It is a slow and difficult process to determine the orbits of long-period binaries with any accuracy, so that only few of these appear in star catalogues at all. Hertzsprung* considers that out of 15,000 known double stars it is only possible to calculate reliable orbits for 80, while about 1000 more shew traces of orbital motion but with periods so long that it is not yet possible to calculate them with any accuracy.

A second] I (40-4). R = 1-372 xlO- 16 h = 6-55 x 10"27 erg seconds J The point of primary significance in these formulae is that they are entirely independent of the nature of the matter which emits the radiation, the constants o-, h, R and G all being universal constants of nature. There is a simple physical reason for this. The radiation inside a hot body at a uniform temperature T is absorbed and re-emitted many times before it reaches the surface, so that the radiation which finally emerges is in thermodynamical equilibrium with the matter of the body.

The alternative interpretation of them as rifts or gaps can hardly be the true one, since it is improbable that there should be so many tunnels through the nebulae all pointing directly towards the earth. The absorbing matter may possibly consist of molecules having absorption bands which cut off all visible light. 31. Closely related to these nebulae from the cosmogonic point of view are probably the "calcium clouds" discovered and investigated by Hartmann, Plaskett-f-, Otto Struvej, and others.

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