Studies of the Nebulae: Made at the Lick Observatory, University of California, at Mount Hamilton, California, and Santiago, Chile, Volume 13University of California Press, 1918 - 268 pages |
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Page 39
... photographic magn . 22 " X 16 " in p . a . 35 ° ; there are minute wedge - shaped ansae in p . a . 24-204 ° . Quite irregular , of helical form . Exceedingly bright ; all the main features show in 10 on S27 ; an exposure of a few ...
... photographic magn . 22 " X 16 " in p . a . 35 ° ; there are minute wedge - shaped ansae in p . a . 24-204 ° . Quite irregular , of helical form . Exceedingly bright ; all the main features show in 10 on S27 ; an exposure of a few ...
Page 59
... photographic magnitude of the central star have been made from the photographs , and are to the nearest magnitude only ; such estimates are in some cases merely approximations , owing to the difficulty of making trustworthy estimations ...
... photographic magnitude of the central star have been made from the photographs , and are to the nearest magnitude only ; such estimates are in some cases merely approximations , owing to the difficulty of making trustworthy estimations ...
Page 64
... photographic image is not a linear function of the exposure time , the use of the term " brightness " is not strictly accurate here , though probably sufficiently so for the short exposures , from which most of the estimates were made ...
... photographic image is not a linear function of the exposure time , the use of the term " brightness " is not strictly accurate here , though probably sufficiently so for the short exposures , from which most of the estimates were made ...
Page 67
... photographic results alone it is evident that we have to do with structures of extraordinary complexity , and the puzzles of the mechanics of the planetary nebulae seem three - fold as bewildering when the attempt is made to fit in as ...
... photographic results alone it is evident that we have to do with structures of extraordinary complexity , and the puzzles of the mechanics of the planetary nebulae seem three - fold as bewildering when the attempt is made to fit in as ...
Page 77
... photographic method ; but up to the year 1912 the remaining objects on his list had not been so observed , nor was the method applied to other nebulae , with the single exception of the Wolf - Rayet star - planetary nebula B.D. + 30 ...
... photographic method ; but up to the year 1912 the remaining objects on his list had not been so observed , nor was the method applied to other nebulae , with the single exception of the Wolf - Rayet star - planetary nebula B.D. + 30 ...
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Studies of the Nebulae: Made at the Lick Observatory, University ..., Volume 13 Lick Observatory,Joseph Haines Moore Affichage du livre entier - 1918 |
Expressions et termes fréquents
appears bright bands bright lines brighter Campbell N₁ central portion central star continuous spectrum dark lane DETAILS OF OBSERVATION diameter diffuse nebulosity disk edge elongated exposure faint fainter figure g slitless Greater Magellanic Cloud H N₁ N₂ Haynes hydrogen hydrogen lines inclination km./sec Lick Obs LICK OBSERVATORY line Ia long Hẞ M. T. Exp major axis minor axis Miss Hobe N Miss Hobe N₁ moderately bright Moore Miss Hobe Moore N Moore N₁ N₂ N₁ N₂ Hẞ N₂ HB N₂ Hẞ Hy nearly round nucleus band object Orion nebula photographic planetary nebulae radial velocity region relative intensities ring Ring Nebula rotation s.n. Planetary Scott N Scott N₁ Sept Slit long small nebulae spectra spectrograms spiral nebulae spiral structure star of magn stellar condensations stellar nucleus ultra-violet under-exposed wave-lengths whorls Wolf-Rayet Wolf-Rayet stars Ηβ Ηγ