Uber den Zusammenhang von Helligkeit und Spektraltypus in den Plejaden, 273 in Astronomische Nachrichten 186 columns 71-78, 1910

1910. 1st Edition. FIRST EDITION OF THE FIRST PRINTED H-R DIAGRAM, probably the most important diagram in stellar astrophysics" (Evans, The Curious Astronomer, 2014). In the volume offered, the German physicist Hans Rosenberg published "The Hertzsprung-Russell diagram (or H-R diagram) -- a scatter diagram showing the relationship between the "intrinsic luminosity" of stars (a measure of their energy output) and their temperatures (as indicated by their "spectral type" or color). The diagram presents stellar evolution—a star begins its life in one place on the chart and moves across the chart during its lifetime" (History of Physics: Wenner Collection).

"The same type of diagram is still used today as a means of showing the stars in clusters without having to initially know their distance and luminosity" (Wikipedia). CONDITION & DETAILS: Complete. Includes volumes 181-186. 4to. Tightly bound in red cloth and calf, scuffed at the edges. Ex-libris with very minimal markings, and none at the spine. Photographic plates throughout. Bright and very clean throughout.