Sujet
Henrietta Leavitt (1868-1921), US astronomer. Leavitt graduated from Radcliffe College in 1892, and joined the Harvard College Observatory in 1895. Her early work on the photographic magnitudes of stars led to her work on Cepheid variables. Using plates m
Légende
Henrietta Leavitt (1868-1921), US astronomer. Leavitt graduated from Radcliffe College in 1892, and joined the Harvard College Observatory in 1895. Her early work on the photographic magnitudes of stars led to her work on Cepheid variables. Using plates made of the Magellanic Clouds, Leavitt discovered about 2400 new variable stars. She also noticed that the brightness variation in the Cepheids was extremely regular, and that the brighter stars had longer periods. By 1912, she had established that the apparent magnitude varied as the logarithm of the period. This was the foundation of the method now used to measure extreme cosmic distances.
Info+
Photographe : Photo Researchers
Crédit
Photo12/Alamy/Science History Images
Notre référence
LMY23T01_G16F3D
Utilisation
uniquement en France
Model release
Non
Property release
Non
Licence
Droits gérés
Format disponible
26,1Mo (610,7Ko) / 22,4cm x 29,2cm / 2640 x 3450 (300dpi)