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 16
... diameter of the field , regarding a field diameter of 6 ° as the unit , while v is the ratio of aperture to focal length , taking the ratio 1:10 as the unit . It will be seen that the distortion due to coma increases as the square of ...
... diameter of the field , regarding a field diameter of 6 ° as the unit , while v is the ratio of aperture to focal length , taking the ratio 1:10 as the unit . It will be seen that the distortion due to coma increases as the square of ...
Page 17
... diameter than will a reflector of great angular aperture , while the former will be slower than the latter , on extended objects like nebulae , in the ratio of the squares of the focal ratios . For example , at a distance of 1 ° from ...
... diameter than will a reflector of great angular aperture , while the former will be slower than the latter , on extended objects like nebulae , in the ratio of the squares of the focal ratios . For example , at a distance of 1 ° from ...
Page 18
... diameter ; structureless . star follows 30 " , but is not connected with the nebula . None of the many small nebulae on this plate appear to coincide with N. G. C. 21 ( Swift ) . 41 s.n. A small , fairly bright , p - type spiral , not ...
... diameter ; structureless . star follows 30 " , but is not connected with the nebula . None of the many small nebulae on this plate appear to coincide with N. G. C. 21 ( Swift ) . 41 s.n. A small , fairly bright , p - type spiral , not ...
Page 19
... diameter ; sharp nucleus ; a rather compact spiral . A very bright , compact , nearly round spiral , 12 in diameter . The nucleus is well defined and shows in a 5m exposure . The matter in the inner whorls is quite bright . 6 s.n. A ...
... diameter ; sharp nucleus ; a rather compact spiral . A very bright , compact , nearly round spiral , 12 in diameter . The nucleus is well defined and shows in a 5m exposure . The matter in the inner whorls is quite bright . 6 s.n. A ...
Page 20
... diameter . unusually beautiful and symmetrical spiral , showing numerous almost stellar condensations . Nucleus bright and small , but not stellar . 34 s.n. Planetary . 5 s.n. Spindle - shaped ; an edgewise spiral 35 long in p.a. 80 ...
... diameter . unusually beautiful and symmetrical spiral , showing numerous almost stellar condensations . Nucleus bright and small , but not stellar . 34 s.n. Planetary . 5 s.n. Spindle - shaped ; an edgewise spiral 35 long in p.a. 80 ...
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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