Memoirs of the Royal Astronomical Society Volume 55

Memoirs of the Royal Astronomical Society Volume 55

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 edition. Excerpt: ...the two contributors. If, for instance, CHANDLER's mean period of 226'1 days be correct for the main wave, the assumed period of 225 days is in err01', and the error will be 5' 5 days in live periods, Hence, instead of A0 and B., remaining constant, they will change slowly. The changes are represented by expressions similar to those written down, if A0 and B., be substituted for A, and B1, and-y=-4-4 be substituted for . And now we have so that the amplitudes are now in the ratio of 2 to 1, which is a very different thing. If this were the case, the average range of 3 magnitudes should sometimes be extended to 4% and sometimes drop to 1%, which is not in acco1-dance with observations. The former ratio of 5 to 1 is much more in accord. 183. From the variations in brightness at maximum and minimum we may be able definitely to separate the components which go to make up the whole variability; but it is obvious that we are inface of a problem of some complexity, which will require the careful discussion of all the material available, and not merely of one set of observations; and such a discussion cannot be entered upon here. We may, however, before leaving the point, tabulate the changes in the coefiicients of the harmonics for three other stars which have periodic terms and have been sufficiently observed to show definite changes. 184. Comparison with Harvard.-In the last column of the printed observations a comparison has been made with Harvard; and to show this in a more compendious form, the differences have been grouped in the same manner as for-comparison with the mean light curve, and are given below. 185. The question arises, what importance are we to attach to the systematic differences between Rousdon...show more

Product details

  • Paperback | 46 pages
  • 189 x 246 x 3mm | 100g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236842855
  • 9781236842855