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The Radial Velocities and Spectral Types of Stars

Nature volume 88, pages 424425 (25 January 1912) | Download Citation



ALTHOUGH the determination of radial velocities is, as a practical proposition, a development of comparatively recent years, the data already secured by the several observatories doing line-of-sight work promises to be of inestimable value in the study of cosmological problems. It is no longer merely a question of “approach” or “recede”—a far greater vista has been opened up as the work has proceeded. Combined with the researches of Kapteyn, Eddington, Dyson, and others on the streaming tendencies disclosed by the discussion of “proper motions,” it promises a rich mine of as yet undisclosed facts concerning the evolution of enormous sidereal systems.


  1. 1.

    Lick Observatory Bulletins, No. 181.

  2. 2.

    Ibid., No. 196.

  3. 3.

    Ibid., No. 195.

  4. 4.

    Astronomische Nachrichten, No. 4547, vol. cxc, p. 193.

  5. 5.

    Catalogue of 470 of the Brighter Stars Classified according to their Chemistry.

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