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)

Connectez-vous pour télécharger cette image en HD