What did Henry Draper discover?
Henry Draper, (born March 7, 1837, Prince Edward County, Va., U.S.—died Nov. 20, 1882, New York City), American physician and amateur astronomer who made the first photograph of the spectrum of a star (Vega), in 1872. He was also the first to photograph a nebula, the Orion Nebula, in 1880.
Who cataloged stars based on their stellar spectrum?
Henry Draper Catalogue
That tremendous job resulted in the Henry Draper Catalogue (HD) of stellar spectra and the Harvard system of spectral classification of stars depending on their stellar temperatures. The HD was published in 1918–1924. It contains 225,000 stars extending down to .
What does HD mean in stars?
The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper …
What is the basis of HD classification of stars?
The work was published in the Henry Draper Catalogue (HD) and Henry Draper Extension (HDE) which contained spectra of 225,000 stars down to ninth magnitude. The scheme is based on lines which are mainly sensitive to stellar surface temperatures rather than actual compositional differences, gravity, or luminosity.
How did Annie Jump Cannon make the world a better place?
Annie Jump Cannon was the first astronomer to develop a simple spectral classification system. She classified 400,000 stars—more than anyone else had achieved previously—and discovered 300 variable stars, five novas, and a double star.
What is the Harvard spectral system?
A system of classifying stars according to the characteristics of their spectra, introduced at Harvard College Observatory in 1890 by E. C. Pickering, which culminated in the *Henry Draper Catalogue.
What did Annie Jump Cannon do for the HR diagram?
Hertzsprung Russell Diagram It plots a star’s luminosity against its surface temperature. Stars are grouped into spectral types which can be viewed as either temperature or color groupings that were created by Annie Jump Cannon in the 1890’s.
Is there anything older than the universe?
One such datum is the existence of a star with an age reported to be older than the cosmos itself. This star is called the Methuselah star, named after the biblical patriarch.
Why was Annie Jump Cannon deaf?
Cannon was a child she had a cold. The cold caused Ms. Cannon to become deaf. Every year she could hear less and less until she couldn t hear anymore.