Plaskett , John Stanley
(1865–1941) Canadian astronomer
Plaskett, who was born at Woodstock, Ontario, was initially trained as a mechanic and began work as such for the physics department of the University of Toronto. He eventually graduated from there in physics and mathematics in 1899. When he moved, in 1903, to the Dominion Observatory in Ottawa it was as mechanical superintendent and not as an astronomer. He gradually moved into astronomy, however, and in 1918 became director of the newly established Dominion Astrophysical Observatory at Victoria, British Columbia, for which he had organized the design, construction, and installation of a new 72-inch (1.8-m) reflecting telescope. He retired in 1935.
Plaskett's field of research was spectroscopy, in particular the measurement of radial velocities of celestial bodies, i.e., their velocities along the line of sight, from the shift in their spectral lines. Using the 72-inch reflector and a highly sensitive spectrograph, many spectroscopic binary systems were discovered. In 1922 Plaskett identified an extremely massive star as a binary, now known as Plaskett's star. In 1927 Plaskett provided confirmatory evidence for the theory of galactic rotation put forward by Bertil Lindblad and Jan Oort.
By 1928 Plaskett, in collaboration with J.A. Pearce, had obtained evidence for the hypothesis formulated by Arthur Eddington in 1926 that interstellar matter was widely distributed throughout the Galaxy; their results showed that interstellar absorption lines, mainly of calcium, took part in the galactic rotation and so the interstellar matter was not confined to separate star clusters. Although this result was first announced by Otto Struve in 1929, Plaskett felt he had priority and was convinced that Struve had obtained his results from him.

Scientists. . 2011.

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  • Plaskett, John Stanley — ▪ Canadian astronomer born Nov. 17, 1865, Woodstock, Ont., Canada died Oct. 17, 1941, Victoria, B.C.       Canadian astronomer remembered for his expert design of instruments and his extensive spectroscopic observations.       Plaskett, a skilled …   Universalium

  • John Stanley Plaskett — (* 17. November 1865 in Oxford County bei Woodstock (Ontario), Kanada; † 17. Oktober 1941 in Victoria) war ein kanadischer Astronom. Der ursprüngliche Maschinenbauer begann 1889 ein Mathematik und Physikstudium. 1903 begann er am Dominion… …   Deutsch Wikipedia

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  • John Stanley Plaskett — Infobox Scientist name = PAGENAME box width = image size =150px caption = PAGENAME birth date = November 17 1865 birth place = death date = October 17 1941 death place = residence = |citizenship = nationality = Canadian ethnicity = field =… …   Wikipedia

  • Plaskett — ist der Familienname folgender Personen: Harry Hemley Plaskett (1893–1980), kanadischer Astronom John Stanley Plaskett (1865–1941), kanadischer Astronom Diese Seite ist eine Begriffsklärung zur Unterscheidung mehrerer mit d …   Deutsch Wikipedia

  • Plaskett's star — starbox short name= Plaskett s Star epoch=J2000.0 constell=Monoceros ra=06h 35m dec=+06° 11 appmag v=6.05 dist ly=6600 dist pc= 2023.52 spectral=O8 names=HR 2422, BD+6°1309, GC 8631, HIP 31646 , HD 47129 Plaskett s Star (formal name HR 2422… …   Wikipedia

  • Harry Hemley Plaskett — (July 5, 1893 January 26, 1980) was a Canadian astronomer who made significant contributions to the fields of solar physics, astronomical spectroscopy and spectrophotometry. From 1932 to 1960, he served as the Savilian Professor of Astronomy at… …   Wikipedia

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  • Étoile de Plaskett — Données d observation (Époque J2000.0) Ascension droite 06h 37m 24,042s Déclinaison +06° 08′ 07,38″ Constellation Licorne Magnitude apparente …   Wikipédia en Français

  • Harry Hemley Plaskett — (* 5. Juli 1893 in Toronto; † 26. Januar 1980) war ein kanadischer Astronom. Sein Vater war der Astronom John Stanley Plaskett. Plaskett war von 1932 bis 1960 Savilian Professor of Astronomy an der University of Oxford. 1963 wurde er mit der… …   Deutsch Wikipedia

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