Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 607
next to the 0-type stars in evolution, and the 0-type starsare supposed to precede the B-type stars. They are in allcases apparently small in size, usually rather dense, particu-larly near their centers, and they have rather well-definedouthnes. They were named by Herschel from their resem-blance… … Fig. 193. — The ring nebulain Lyra. Photographed bySullivan at the Yerkes Ob-servatory with the 40-inchtelescope. CH. xm, 304] THE SIDEREAL UNIVERSE 561 at least three times those of the stars of Type B. This issquarely opposed to the theory that they condense into starsof Types O and B. If this…
Astronomy
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