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Home > Studies of the Nebulae Volume 13; Made at the Lick Observatory, University of California, at Mount Hamilton, California, and Santiago, Chile: (English)
Studies of the Nebulae Volume 13; Made at the Lick Observatory, University of California, at Mount Hamilton, California, and Santiago, Chile: (English)

Studies of the Nebulae Volume 13; Made at the Lick Observatory, University of California, at Mount Hamilton, California, and Santiago, Chile: (English)

          
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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...from the center of the slit on the two spectrograms of April 30 and August 8, 1916, taken with the slit in position angles respectively 345 and 165. The same correction was applied to the other observations and, in particular, in fixing the scale in the drawing of the spectrogram of May 1, 1916, with the slit in position angle 255. This uncertainty should be borne in mind in comparing the relative intensities at corresponding points in the three drawings. The structure of the lines, somewhat masked by over-exposure and the coarser grain of the Seed 30 plates, is shown more clearly on the spectrogram of August 8 (fig. 52c i, which was secured with a narrow slit on a Seed 23 plate. The brighter red side of the line is seen to be the brighter component of a double line, and the complex line appears to be an example of the phenomenon observed in the spectrum N.G.C. 2392. In the measurement of spectral lines showing such marked changes in relative intensities within the lines, our practice has been in general to bisect the width of the line, except of course where the line is plainly separated into two components. A close agreement between the radial velocities from the lines on different plates is therefore not to be expected. Our measures of radial velocity at the points a and b near the ends of the line, and at c near the center (with subscripts 1, 2, 3, 4), are contained in the following tables, which give the results when the slit was placed in the direction of the long ansae, perpendicular to this direction, and at an angle of 45 to it, respectively. Major Axis Radial velocities in km./sec. The values given above are the means of the measures of N, and N, on the plate of April 30.84, and are for the N, line alone on the other two plates. On the spectrogram...


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Product Details
  • ISBN-13: 9781130799606
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 116
  • Series Title: English
  • Weight: 222 gr
  • ISBN-10: 1130799603
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 6 mm
  • Width: 189 mm


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Studies of the Nebulae Volume 13; Made at the Lick Observatory, University of California, at Mount Hamilton, California, and Santiago, Chile: (English)
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