Contributions from the Mount Wilson Observatory Volume 11
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Contributions from the Mount Wilson Observatory Volume 11

Contributions from the Mount Wilson Observatory Volume 11


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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. 1922 Excerpt: ... 115 42001 4686 faint and hazy H7 454 4026' 4471 just perceptible To these maybe added 4481 in B.D. + 30623 nearly as strong as X4542, and in B.D. +6o2522, X4147 stronger than X4471, and H and K faint and sharp. With these exceptions, the spectra could be described as Od with the bright lines suppressed to the extent of a trace of absorption in X 4686. Their position is intermediate between the Wolf-Rayet type and Oes. Radial velocities for four plates of each are +35.4 km for B.D. +3o623 and--34.5 km for B.D. +6o2522. A single slit spectrogram of the central star in N.G.C. 246 made with one prism and a 7-inch camera shows a spectrum similar to B.D. +6o2522, the central star in N.G.C. 7635. In all three objects, the line X 4542 is the strongest except the hydrogen lines. By way of comparison, a spectrogram of the nucleus of the smaller planetary I.C. 2149 was obtained, using one prism and an 18-inch camera on the 100-inch reflector. This nucleus is one for which Wright reported a continuous spectrum with no bright lines. An exposure of eight hours gave a legible spectrum in spite of very poor seeing conditions. The rather faint continuous spectrum of the nucleus holds up unusually well toward the violet, and is crossed by the bright lines of the nebula, so sharp and narrow that their source is unmistakable. Only three dark lines can be detected. H0 and H? are very faint and hazy and almost obliterated by the strong bright nebular lines superposed. The third dark line is X 4542, exceedingly faint, but free from any nebular line. No trace of X 4686, either bright or dark, can be seen. Thus the nuclear spectrum, freed from the bright lines due to the nebula, is rather similar to a weak spectrum of the three central stars discussed above. 1 The lines XX 4542,42...


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Product Details
  • ISBN-13: 9781130530087
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 136
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 1130530086
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 254 gr

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