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Contributions from the Princeton University Observatory Volume 4-10

Contributions from the Princeton University Observatory Volume 4-10


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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. 1916 edition. Excerpt: ... om.017. TW CASSIOPEIAE The variability of TW Cassiopeiae was discovered by Miss Leavitt1 on the Harvard plates, and announced as of the Algol type with a variation of eight tenths of a magnitude. Observations by Munch,2 soon after discovery, left it doubtful whether the variation was irregular or of Algol type. Zinner thought it was irregular also, from his early observations,3 but later 4 found it to be a variable of Algol type with a period of I day 10 hours 16.7 minutes and a variation from 8m.3 to 9m.0. My observations extend over 280 of Zinner's periods, from Julian Day 2,419,692 to 2,420,092. The first observations of several minima indicated that the odd and even minima differed in depth. The difference persisted as observation was continued. The observations were assembled on a period double that of Zinner's, and the plot of the normals confirmed the suspicion. That the period is really double that given by Zinner is independently confirmed by three facts: (1) there is a difference in depth of the two eclipses amounting to om.05; (2) the interval from primary eclipse to secondary is 7.8 minutes longer than from secondary to primary; (3) the two eclipses are of different duration--the primary being at least 36 minutes longer than the secondary. From 48 comparisons with + 65.291, + 65.290 and + 65.294, whose magnitudes are given in Harvard Annals 64 as 8.85, 9.37 and 9.92 respectively, a value of 10.39 was found for the magnitude of the comparison star, + 64.343. No reason was found for suspecting the comparison star of any variation. The adopted values of Epoch and Period were derived from a least squares adjustment of my own observations of seven primary and six secondary minima, and Harvard observations of one primary: E =...


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Product Details
  • ISBN-13: 9781234188412
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 50
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1234188414
  • Publisher Date: 15 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr


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