Publications of the Astronomical Laboratory at Groningen Volume a -A - 19-25

Publications of the Astronomical Laboratory at Groningen Volume a -A - 19-25

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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. 1908 edition. Excerpt: ...reduction of the values of jua to Auwers. A similar irregularity was shown by the proper motions of the faint stars of Taylor, derived originally by Prof. Kapteyn from the positions of Taylor and Tucker after reduction to Newcomb. In the same region the values of /u of the stars of Newcomb, which are much brighter in the mean, do not show a preference for negative values. The anomaly of the proper motions thus seems to be attributable to an error of magnitude for which Prof. Kapteyn has applied a positive correction of such an amount that the mean value of (xa obtained by combining the different hour-groups with equal weights, became zero (See page 18 etc). The process is equivalent to the supposition that the peculiar proper motions in right-ascension of Taylor-tucker as well as those of the NEWcoMB-stars in the same region do not show a preference for positive or negative values. This correction too would be destroyed if to the whole of the TAYLOR-stars we were to apply corrections obtained from a comparison with the proper motions of the stars of Auwers in the same region, which as a rule are relatively bright stars. To sum up: there are objections to the application of any further constant correction to the fxa of the stars of Newcomb, Taylor and Gill. Happily such a constant correction is practically without any influence on the position of the apex. More important would be the derivation of periodic corrections for the na. The number of our stars in however hardly sufficient for the derivation of trustworthy corrections of this kind. In order to avoid any misconception, I will remark that my statement, that the proper motions have been reduced to the system of Auwers, must not be taken to the letter. It has been my aim to...show more

Product details

  • Paperback | 88 pages
  • 189 x 246 x 5mm | 172g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236788117
  • 9781236788115