Annals of the Cape Observatory Volume 10, Pts. 4-8

Annals of the Cape Observatory Volume 10, Pts. 4-8

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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. 1913 edition. Excerpt: ...time. Moreover, their orbital elements are not sufficiently well determined to enable the orbital changes of velocity to be eliminated with any confidence. The later observations which were secured of these two stars have therefore not been utilised for the determination of the constant of aberration. The velocity variation of a Canis Majoris has a period of 40 years and a range of only about 2 km. per sec. During the period covered by the observations the velocity variation is practically linear and can be allowed for. In Table I. is given a list of the stars, the observations of which have been utilised for the derivation of the constant of aberration. The first column gives the name of the star, the second and third columns give the position for 1900, the fourth and fifth columns give the magnitude and spectral type, the sixth column gives the number of plates secured, and the last column gives the number of thereference plate used as a basis for comparison in the measurements in the Hartmann spectrocomparator. Astrophysical Journal, 44, p. 256, 1916. t Loc. cit., p. 251. In the measurements in the Hartmann spectrocomparator against the comparison plate, settings were made in the neighbourhood of twelve selected iron lines. Three different regions were used, the wave-lengths of the iron lines, according to Rowland, being for these three regions as follows: --Table II. Wave-lengths of selected lines. Details of the reference plates are given in the following table Table III., Standard Comparison Plates. In the above table are given in the first column the number of the standard plate, in the second column the name of the star, and in the third column the spectral region in which the comparisons were made. The fourth column gives the adopted..show more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236617770
  • 9781236617774