The Gases of the Ring Nebula in Lyra

Details The Gases of the Ring Nebula in Lyra The Gases of the Ring Nebula in Lyra

Apr 1909

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1909natur..80..158b&link_type=abstract

Nature, Volume 80, Issue 2058, pp. 158-159 (1909).

Astronomy and Astrophysics

Astronomy

Scientific paper

EVERY friend of astronomical research has learned with great pleasure the news that Prof. Wolf, of Heidelberg, has succeeded in proving by spectrum photography that the well-known ring nebula in Lyra consists of four different gases, which, owing to the rapid rotation of the ring, have been separated and concentrated in four different layers. On using the image of the ring itself instead of the slit of a spectroscope, photographic images of the rings corresponding to the different spectral lines were obtained on the plates, but the dimensions of the rings were found to be different and to correspond to four gases of which the ring nebula is composed. The smallest ring, A, representing the innermost part of the ring, is composed of an unknown gas; the next largest ring, B, is composed of hydrogen; the next largest ring, C, consists of helium; and the largest ring, D, consists of an unknown gas. The question arises, What is the nature of the two unknown gases?

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