113002-01
Untersuchungen uebfr (!) veraenderliche Eigenbewegungen. 2 Teile in 1 Band.
Königsberg, Dalkowski bzw. Leipzig Engelmann, 1862-68. - (26,5 x 22 cm). (4) 96 S.; (6) 158 (1) S. Moderner Pappband im Stil der Zeit.
Einzige Ausgabe mit handschriftlicher Widmung des Verfassers. - Der erste Teil, als Dissertation erschienen, beinhaltet die Bestimmung der Elemente der Procyonbahn und Untersuchung der für veränderlich gehaltenen Eigenbewegungen von alpha Virginis, betha Orionis und alpha Hydrae. Der zweite Teil, als Publikation der Astronomischen Gesellschaft erschienen, enthält die Bestimmung der Elemente der Siriusbahn. - "He made a great number of observations and calculations of planets, comets, and variable stars as early as 1857-1859, his first years at Göttingen University. During his term as assistant at Königsberg (1859-1862) he made heliometric observations of double stars, which led him to his dissertation 'Untersuchungen über veränderliche Eigenbewegungen' (1862). Bessel's assumption that certain changes in the proper motions of the stars Sirius and Procyon are based on the presence of invisible companion stars had opened a new field in celestial mechanics. Auwers was able to derive the orbits for both Sirius and Procyon as weakly eccentric ellipses, corresponding to the motion of the visible principal stars around the center of gravity of the double star system in forty or fifty years, respectively. A few years later it became possible also to observe their very faint companions by optical means... Auwers' lifework was the meticulous observation and calculation necessary to draw up star catalogs with highly accurate positions of stars. Since this required exact knowledge of the proper motions of the fixed stars, he also made new reductions of previous observations" (DSB). - Der zweite Teil etwas stockfleckig und das erste und letzte Blatt gebräunt. - DSB 1, 339
Untersuchungen uebfr (!) veraenderliche Eigenbewegungen. 2 Teile in 1 Band.
Königsberg, Dalkowski bzw. Leipzig Engelmann, 1862-68. - (26,5 x 22 cm). (4) 96 S.; (6) 158 (1) S. Moderner Pappband im Stil der Zeit.
Einzige Ausgabe mit handschriftlicher Widmung des Verfassers. - Der erste Teil, als Dissertation erschienen, beinhaltet die Bestimmung der Elemente der Procyonbahn und Untersuchung der für veränderlich gehaltenen Eigenbewegungen von alpha Virginis, betha Orionis und alpha Hydrae. Der zweite Teil, als Publikation der Astronomischen Gesellschaft erschienen, enthält die Bestimmung der Elemente der Siriusbahn. - "He made a great number of observations and calculations of planets, comets, and variable stars as early as 1857-1859, his first years at Göttingen University. During his term as assistant at Königsberg (1859-1862) he made heliometric observations of double stars, which led him to his dissertation 'Untersuchungen über veränderliche Eigenbewegungen' (1862). Bessel's assumption that certain changes in the proper motions of the stars Sirius and Procyon are based on the presence of invisible companion stars had opened a new field in celestial mechanics. Auwers was able to derive the orbits for both Sirius and Procyon as weakly eccentric ellipses, corresponding to the motion of the visible principal stars around the center of gravity of the double star system in forty or fifty years, respectively. A few years later it became possible also to observe their very faint companions by optical means... Auwers' lifework was the meticulous observation and calculation necessary to draw up star catalogs with highly accurate positions of stars. Since this required exact knowledge of the proper motions of the fixed stars, he also made new reductions of previous observations" (DSB). - Der zweite Teil etwas stockfleckig und das erste und letzte Blatt gebräunt. - DSB 1, 339
550 €