BornGrenoble, Isère, France, 31 January 1895
DiedParis, France, 28 November 1977
French observational astronomer Daniel Chalonge is remembered primarily for his work on determining the properties of stars from relatively broadband spectral information. His thesis work in Paris was directed by French physicists Aimé Cotton and Charles Fabry. Chalonge had several dozen students, some of whom (especially Lucienne Divan) have also contributed to the study of stellar classification.
In 1941, Chalonge and Daniel Barbierannounced a way of measuring the temperature, surface gravity (related to luminosity and mass), and abundance of heavy elements in stars from information on color, rather than detailed, high-resolution spectra. They defined three parameters describing the behavior of spectra near a wavelength where hydrogen gas is a strong absorber. Their parameters were eventually shown to be well correlated with stellar temperatures, surface gravities, and compositions by derived from...
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