The Radial Velocities of Globular Clusters, and de Sitter's Cosmology

Details The Radial Velocities of Globular Clusters, and de Sitter's Cosmology The Radial Velocities of Globular Clusters, and de Sitter's Cosmology

Mar 1924

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1924natur.113..350s&link_type=abstract

Nature, Volume 113, Issue 2836, pp. 350-351 (1924).

Computer Science

1

Scientific paper

IF R be the curvature radius of the world, an invariant of the manifold, de Sitter's empty space-time is characterised, in the two-dimensional case which interests us here, by the corresponding elliptic space being covered by the interval σ=o to ½π. With the observer's station O as origin, let a star be coerced to remain at a fixed distance r. Then, the permanence of atoms as natural clocks being granted, the observer should perceive a wave-length increment of a line of the stellar, as compared with his local spectrum, the latter for small r/R. This is de Sitter's own result (1917), a second-order effect due to mere distance, based upon the artificial assumption that the lightsource is at rest relatively to the observer. Its characteristic feature is that it gives always a positive or red-shift, as would be the common Doppler effect for a receding star. Since the B-stars were known to show a systematic displacement corresponding to about +4.5 km./sec., de Sitter welcomed them as so many supporters of his formula. Ascribing ⅓ of the effect to their own gravitation, he represented the remaining ⅔ by that formula, which, with r=3.107 as the average distance of these stars1, gave him R=7.109. This would, nowadays, seem rather too small, being just below Shapley's estimate, 9.109, of the semi-diameter of our galaxy. Such considerations, however, need not detain us.

Affiliated with

Also associated with

No associations

Rating

The Radial Velocities of Globular Clusters, and de Sitter's Cosmology does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Radial Velocities of Globular Clusters, and de Sitter's Cosmology, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Radial Velocities of Globular Clusters, and de Sitter's Cosmology will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-777046