Metadata
Author: WikiMatrix
Data
English[en]
Keenan was an American spectroscopist who collaborated with William Wilson Morgan and Edith Kellman (1911–2007) to develop the MKK stellar spectral classification system between 1939 and 1943.
Spanish[es]
Keenan colaboró con William Wilson Morgan y Edith Kellman para desarrollar el sistema de clasificación espectral estelar MKK entre 1939 y 1943.