Heinrich Kayser

Heinrich Kayser (1853–1940) was a German physicist whose spectroscopy research helped establish the study of stellar spectra and whose reference works shaped German physics.

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Carl Runge: Carl Runge was a German mathematician and physicist who studied spectroscopy and collaborated with Heinrich Kayser. Runge collaborated with Kayser on systematic studies of the spectra of chemical elements.
Spectroscopy: Spectroscopy studies how matter emits, absorbs, or scatters electromagnetic radiation. Kayser’s research used spectral measurements to identify and compare the emissions of elements.
Stellar spectroscopy: Stellar spectroscopy analyzes stars by examining the wavelengths of their emitted and absorbed light. Kayser investigated stellar spectra and helped connect their lines with terrestrial elements.
Spectral classification: Spectral classification groups astronomical objects by patterns in their spectra. The growing ability to compare stellar spectra depended on the systematic line data Kayser helped produce.
Hermann von Helmholtz: Hermann von Helmholtz was a German physicist and physician whose work spanned energy, acoustics, optics, and physiology. Helmholtz was Kayser’s doctoral adviser and a leading figure in the Berlin physics community.
Atomic emission spectrum: An atomic emission spectrum is the set of discrete wavelengths emitted by excited atoms. Kayser and Runge catalogued element-specific line patterns in these spectra.
Astrophysics: Astrophysics applies physical laws to the properties and behavior of celestial objects. Spectroscopic evidence became one of the principal ways to determine what stars contain.
Chemical element: A chemical element is a substance whose atoms share the same number of protons. Matching laboratory spectral lines to celestial lines linked spectroscopy to the identification of elements.
Robert Bunsen: Robert Bunsen was a German chemist who developed spectroscopy as a method of chemical analysis with Gustav Kirchhoff. Bunsen’s spectroscopic methods helped define the experimental field in which Kayser worked.
Spectral line: A spectral line is a narrow feature at a particular wavelength in an emission or absorption spectrum. His measurements depended on locating and precisely recording individual lines.