Williamina
Paton Stevens Fleming (1857–1911)
Harvard University Open Collections Program
Williamina
Paton Stevens Fleming was born in Dundee, Scotland, on May 15, 1857. Her talent
in school was obvious from an early age, and at age 14 she began teaching in
the Dundee public schools. In 1877 she married James Fleming, and a year later
the couple immigrated to Boston to start a new life in America. In 1879, when
she was pregnant with her first child, James left her and their unborn son.
Only
23 years old and a single mother, Fleming found employment as the housekeeper
for Edward Pickering, a professor of astronomy at Harvard and the director of
the Harvard College Observatory. Irritated by the poor work done by his male
employees at the observatory, Pickering reportedly declared that his maid could
do a better job, and shortly thereafter, in 1881, he hired Fleming to do some
clerical work and mathematical calculations at the Observatory.
Fleming
quickly proved Pickering right by developing a new system to classify stars
according to their spectra, or the unique pattern of lines caused by the
refraction of a star's light through a prism. Thanks to her new classification
system, which became known as the "Pickering-Fleming System," Fleming
cataloged over 10,000 stars within the next nine years. In 1890, she published
her findings in the Draper Catalogue of Stellar Spectra.
Pickering
eventually put Fleming in charge of editing all studies published by the
Harvard Observatory and allowed her to hire dozens of young women to support
her expanding stellar exploration efforts. One of these young women was
Henrietta Swan Leavitt, who later discovered how to measure the universe. In
1898, the Harvard Corporation appointed Fleming to be the curator of
astronomical photographs at the Harvard College Observatory, making her the
first woman to hold this important position.
During the course of her career, Fleming
discovered 10 novae, 52 nebulae, and 310 variable stars—a remarkable
achievement for someone without a formal education in astronomy. Recognizing
her contributions to the discipline, in 1906 the Royal Astronomical Society
elected Fleming to its organization, the first time that prestigious body
admitted an American woman. In 1910, she reached the pinnacle of her career by
discovering white dwarfs, which are very hot and dense stars that are white in
color. On May 21, 1911, Fleming died of pneumonia in Boston, Massachusetts.
