Stellar Motions, With Special Reference to Motions Determined By Means of the Spectrograph
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We shall utilize only the t components of the observed proper motions. The results are condensed in Table XIX, in terms of visual magnitude. The proper-motion data were taken for the most part from Kapteyn's valuable lists in Piihli- cations of the Astronomical Laboratory at Groningen, No. 7, and the rest were collected from various sources. Stars whose t components of proper motion exceed 0".30 per annum were excluded. The numbers of stars of Secchi's Type I, Type II, Types I and II combined, ...the average t components, and the average residual radial velocities, are given in the table.
TABLE XIX Parallaxes by Magnitudes and Types From Radial Velocities and T Components of Proper Motion Type I Type II T\ 'PES I and II Vis. Mag.
11 7"™ F„, km.
n T,„ km.
km.
2.51-3.50 36 0".0148 9.2 50 0".0508 15.3 86 0".0357 12.7 3.51-4.50 76 .0279 8.8 150 .0545 15.3 226 .0455 13.1 4.51-5.50 58 .0266 8.6 162 .0352 14.0 220 .0329 12.5 7r„„ Type I "■„,, Type II 7r,„ Types laud II Vis. Mag.
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To quickly assess the difficulty of the text, read a short excerpt:
We shall utilize only the t components of the observed proper motions. The results are condensed in Table XIX, in terms of visual magnitude. The proper-motion data were taken for the most part from Kapteyn's valuable lists in Piihli- cations of the Astronomical Laboratory at Groningen, No. 7, and the rest were collected from various sources. Stars whose t components of proper motion exceed 0".30 per annum were excluded. The numbers of stars of Secchi's Type I, Type II, Types I and II combined, ...the average t components, and the average residual radial velocities, are given in the table.
TABLE XIX Parallaxes by Magnitudes and Types From Radial Velocities and T Components of Proper Motion Type I Type II T\ 'PES I and II Vis. Mag.
11 7"™ F„, km.
n T,„ km.
km.
2.51-3.50 36 0".0148 9.2 50 0".0508 15.3 86 0".0357 12.7 3.51-4.50 76 .0279 8.8 150 .0545 15.3 226 .0455 13.1 4.51-5.50 58 .0266 8.6 162 .0352 14.0 220 .0329 12.5 7r„„ Type I "■„,, Type II 7r,„ Types laud II Vis. Mag.
What to read after Stellar Motions, With Special Reference to Motions Determined By Means of the Spectrograph?
You can find similar books in the "Read Also" column, or choose other free books by William Wallace Campbell to read onlineMoreLess
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