Monthly Notices of the Royal Astronomical Society Volume 61

Monthly Notices of the Royal Astronomical Society Volume 61

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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. 1901 edition. Excerpt: ...The observations made by me of the spectrum of Nova at present extend from February 25 to March 6. O.""162 and 24th the star was not visible. On the 25th some gumPds the spectrum were obtained through passing gaps in the. The star was then considerably brighter than a Persei. general character of its spectrum did not subsequently cnang, although apparently the red hydrogen line became brighter. From February 27 till March 3 photographs of the spec were obtained by me on each night with the 12-inch object g prism, and again on March 5 and 6. The two enlarged spectra exhibited were taken on February 27 and March 3. In extent, they reach from (H ) to the position of the (6) line of magnesium. Comparison spectra of Sirius and ft Cruets are mounted on the same plate. The hydrogen series are at once identified in the spectrum of Nova. They appear both as ill-defined absorption lines and as broad bright bands, displaced towards the red, but joining up to the dark lines. The helium series of lines do not appear with any certainty either as bright or as dark lines or bands. The calcium (K) line is present, and there are other absorption bands which appear to be partly due to calcium and titanium. There are also other indistinct bright bands which have not been identified. On the second photograph, taken on March 3, when the star had diminished somewhat in brightness, the spectrum remains the same, except that some of the dark bands have become more prominent. The comparison with the spectrum of Sirius shows a certain correspondence between the grouping of the absorption lines in that spectrum and the dark bands in the spectrum of Nova. The correspondence is far from clear, but it is sufficient to suggest the idea that Nova is a Sirian star...show more

Product details

  • Paperback | 202 pages
  • 189 x 246 x 11mm | 372g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • Illustrations, black and white
  • 1236514823
  • 9781236514820