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- W2024432839 abstract "Henry Draper Memorial THE study of stellar spectra by means of photography was one of the most important investigations undertaken by the late Prof. Henry Draper. He was actively engaged in this research during the last years of his life. His plans included an extensive investigation, one object of which was to catalogue and classify the stars by their spectra. Mrs. Henry Draper has made provision, at the Observatory of Harvard College, for continuing these researches, as a memorial to her husband. The results already obtained, with the aid of an appropriation from the Bache Fund, permit the form of the new investigation to be definitely stated. The part of the sky to be surveyed is that extending from the North Pole to the parallel of 300 south declination. Each photograph will be exposed for about one hour, and will include a region 100 square. The telescope employed has an aperture of 20 centimetres (8 inches), and a focal length of 117 centimetres (inches). The object-glass is covered by a prism, and the resulting spectrum of each star in the region photographed has a length of about 1 centimetre; which enables the character of the spectra of stars from the fifth to the eighth magnitude to be determined. A modification of the apparatus is employed for the brighter stars." @default.
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- W2024432839 date "1886-04-01" @default.
- W2024432839 modified "2023-09-26" @default.
- W2024432839 title "Photographic Study of Stellar Spectra" @default.
- W2024432839 doi "https://doi.org/10.1038/033535a0" @default.
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