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CHAPTER V.
THE SPECTRA OF THE STARS.
Principles of Spectrum Analysis-Description of the Visible Spectrum-
Special Lines and Wave-Lengths - Classification of Stellar Spectra
-General Results of Spectrum Analysis .
CHAPTER VI.
PROPER MOTIONS OF THE STARS.
Apparent and Real Motions-Swiftness of the Motions-Stars of Large
Proper Motion-Moving Systems of Stars-Radial Motions of the
Stars-The Motion of the Sun-Position of the Solar Apex-Speed
of the Solar Motion.
CHAPTER VII.
VARIABLE STARS.
Periodic Stars-Light Curve of a Star-The Omicron Ceti Type-The
Algol Type- The Beta Lyra Type - Combination of the Two
Types-Variations of Eta Aquilæ—Classification of Variable Stars
-Possible Secular Variations of the Brillancy of Stars-Spectra of
Variable Stars.
CHAPTER VIII.
NEW STARS.
Eta Argus-List of New Stars-Tycho's Star of 1752-Kepler's Star of
1604-T Corona-Nova Aurigæ-Nova Persei
CHAPTER IX.
THE PARALLAXES OF THE STARS.
-
Early Attempts to Measure Parallax First Measures of Parallax-
Modern Methods - The Heliometer and Photographic Telescope-
Surveys for Parallax
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140
CHAPTER X.
SYSTEMS OF STARS.
Double Stars-Position, Angle, and Distance-Orbits of Double Stars-
Binary Systems of Sirius and Procyon - Orbit of Alpha Centauri-
System of Capella - Triple and Multiple Systems - Spectroscopic
Binary Systems-Star-Clusters-Variable Stars in Clusters
153
CHAPTER XI.
NEBULAE.
Great Nebula of Orion Other Remarkable Nebula - Discovery of
Nebula by Photography-Physical Constitution of the Nebula
178
CHAPTER XII.
CONSTITUTION OF THE STARS.
Masses and Densities of the Stars-Diversities among the Stars-Masses
and Densities of the Binary Systems
Stars
- Gaseous Constitution of the
191
CHAPTER XIII.
STELLAR EVOLUTION.
Life History of a Star-Changes in the Spectra
CHAPTER XIV.
THE STRUCTURE OF THE HEAVENS.
Is the Universe Finite ?-Arrangement of the Stars in Space-Relation of
the Milky Way to the Universe Possible Hypotheses as to the
Arrangement of the Stars
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. 226
CHAPTER XV.
APPARENT DISTRIBUTION OF THE STARS IN THE SKY.
Distribution of the Lucid Stars-Distribution of the Fainter Stars-Dis-
tribution of the Stars having Sensible Proper Motions-Distribution
of Fifth Type .
238
Description of the Milky Way - Lucid Stars belonging to the Milky
Way- Fainter Stars belonging to the Milky Way- Rifts in the
Milky Way
258
264
CHAPTER XVIII.
THE PROGRESSION IN THE NUMBER OF STARS AS THE
BRIGHTNESS DIMINISHES.
Ratio of this Increase in Different Regions of the Sky Higher ratio in
the galaxy
277
CHAPTER XIX.
STATISTICAL STUDIES OF PROPER MOTIONS.
Components of the Proper Motion Mean Parallax of the Stars of the
Second Magnitude - Motions of the Two Principal Spectral Types
of Stars-Kapteyn's Researches-Relation of the Proper Motions to
the Solar Motion
CHAPTER XX.
THE DISTRIBUTION of the STARS IN SPACE.
Number of Stars at Different Distances-Probable Thickness of the Stars
in Space-Mean Parallaxes of the Stars-Possible Distance of the
286
ILLUSTRATIONS
THE TRIPHID NEBULA
Frontispiece
LAW OF CHANGE of the Magnitude of A STAR WITH ITS DISTANCE. 15 PLAN OF THE SPECTRUM
EXAMPLES OF STELLAR SPECTRA
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