File:Astronomy for high schools and colleges (1881) (14763878395).jpg

Identifier: astronomyforhigh00newc (find matches)
Title: Astronomy for high schools and colleges
Year: 1881 (1880s)
Authors: Newcomb, Simon, 1835-1909 Holden, Edward Singleton, 1846-1914, joint author
Subjects: Astronomy
Publisher: New York, H. Holt and Company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Fig. 126.—the omega or HORSEsnoE nebula. HI 462 ASTMOMOMT, % 3. STAR CLUSTERS. The most noted of all the clusters is the Pleiades, which havealready been briefly described in connection with the constellationTaurus. The average naked eye can easily distinguish six starswithin it, but under favorable conditions ten, eleven, twelve, or
Text Appearing After Image:
Fig. 127.—the trifid nebula. more stars can be counted. With the telescope, over a hundredstars are seen, A view of these is given in the map accompanyingthe description of the Pleiades, Fig. 113, p. 425. This group con-tains Tempels variable nebula, so called because it has been sup-posed to be subject to variations of light. This is probably not avariable nebula. NEBULJE AND CLUSTERS. 463 The clusters represented in Figs. 129 and 130 are good examplesof their classes. The first is globular and contains several thousandsmall stars. The central regions are densely packed with stars,and from these radiate curved hairy-looking branches of a spiralform. The second is a cluster of about 200 stars, of magnitudesvarying from the ninth to the thirteenth and fourteenth, in whichthe brighter stars are scattered in a somewhat unusual manner

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