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Home > History and Archaeology > History > Spectrophotometric Methods for Determining Stellar Luminosity Volume 11, No. 228
Spectrophotometric Methods for Determining Stellar Luminosity Volume 11, No. 228

Spectrophotometric Methods for Determining Stellar Luminosity Volume 11, No. 228


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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: ... spectra have been obtained for the nuclei of all six of the nebulae. The dispersion is small, about 5.0 mm from H/3 to He, and conclusions based on them are not as certain as one would wish. All six are essentially similar; at least no difference could be made out on the small-dispersion plates. No bright lines or bands are seen, and all show the well-known strength in the ultraviolet which Wright first reported. This similarity of slitless spectrograms, together with the results of a detailed study of three higher-dispersion spectra taken with a slit, permits the assumption that we have in these central stars a class of objects intermediate between stars involved in extended emission nebulae and in the smaller planetaries. Wright himself published observations of only two planetaries with mean diameters greater than one minute of arc. These are N.G.C. 4361 and 6720. In both cases the nucleus gave a continuous spectrum with no bright lines. His fifteen nebulae whose nuclei show no bright lines have a mean diameter of about 30" as against 20" for the fifteen whose nuclei do show bright lines, probably of the Wolf-Rayet type.1 The evidence, as far as it goes, points to a progression in spectral type of central or involved stars from the small planetaries to the large ones, and this progression joins immediately on to that of the extended nebulae. The complete sequence of stars involved in galactic nebulae can be represented as follows: Small planetaries Wolf-Rayet Large planetaries: Intermediate between Wolf-Rayet and Oes Extended emission nebulae Oes and Bo Extended "continuous" nebulae...B1 and later The overlap is surprisingly small and for the most part confined to nebulae with unusual forms or spectra. No conclusions have been formed...


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Product Details
  • ISBN-13: 9781130724578
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 132
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 1130724573
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 249 gr

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Spectrophotometric Methods for Determining Stellar Luminosity Volume 11, No. 228
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