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The unusual faintness of white dwarfs was first recognized in 1910 by Henry Norris Russell, Edward Charles Pickering, and Williamina Fleming ;< sup >, p. 1 </ sup > the name white dwarf was coined by Willem Luyten in 1922.

In 1910, Henry Norris Russell, Edward Charles Pickering and Williamina Fleming discovered that, despite being a dim star, 40 Eridani B was of spectral type A, or white.

* May 21 – Williamina Fleming, Scottish astronomer ( b. 1857 )

* May 15 – Williamina Fleming, Scottish astronomer ( d. 1911 )

Williamina Paton Stevens Fleming ( May 15, 1857 – May 21, 1911 ) was a Scottish astronomer.

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Antonia Maury, who was also Henry Draper's niece, insisted on a complex classification system while Williamina Fleming, who was overseeing the project for Pickering, wanted a much more simple, straightforward approach.

The prototype star RR Lyrae was discovered prior to 1899 by Williamina Fleming, and reported by Pickering in 1900 as " indistinguishable from cluster-type variables ".

He also, along with Williamina Fleming designed a stellar classification system based on an alphabetic system for spectral classes that was first known as the Harvard Stellar Classification and became the basis for the Henry Draper Catalog.

Under the direction of Harlow Shapley, the observatory had already offered more opportunities in astronomy to women than other institutions, and notable achievements had been made earlier in the century by Williamina Fleming, Antonia Maury, Annie Jump Cannon, and Henrietta Leavitt.

The nebula was first recorded in 1888 by Williamina Fleming on photographic plate B2312 taken at the Harvard College Observatory.

# REDIRECT Williamina Fleming

Williamina Fleming discovered a nova-like spectrum in the Henry Draper Memorial photographs and announced it as a potential nova in 1904.