A Popular History of Astronomy During the Nineteenth Century Fourth Edition
CHAPTER XII
STARS AND NEBULAE
Stellar Chemistry--Four Orders of Stars--Their Relative Ages--Gaseous Stars--Spectroscopic Star-Catalogues--Stellar Chemistry--Hydrogen Spectrum in Stars--The Draper Catalogue--Velocities of Stars in Line of Sight--Spectroscopic Binaries--Eclipses of Algol--Catalogues of Variables--New Stars--Outbursts in Nebulae--Nova Aurigae--Nova Persei--Gaseous Nebulae--Variable Nebulae--Movements of Nebulae--Stellar and Nebular Photography--Nebulae in the Pleiades--Photographic Star-charting--Stellar Parallax--Double Stars--Stellar Photometry--Status of Nebulae--Photographs and Drawings of the Milky Way--Star Drift 372