Table of Contents
- 1 Who reorganized the spectral classification scheme?
- 2 Who came up with the spectral classification for stars?
- 3 WHO classified the stars?
- 4 Who cataloged stars based on their stellar spectrum?
- 5 Where was Annie Cannon born?
- 6 What is meant by spectral class?
- 7 How old are all stars in a star cluster?
- 8 How many stars are in a globular cluster?
Who reorganized the spectral classification scheme?
Annie Jump Cannon
The scheme in use today is the Harvard spectral classification scheme which was developed at Harvard college observatory in the late 1800s, and refined to its present incarnation by Annie Jump Cannon for publication in 1924.
Who came up with the spectral classification for stars?
The current spectral classification scheme was developed at Harvard Observatory in the early 20th century. Work was begun by Henry Draper who photographed the first spectrum of Vega in 1872. After his death, his wife donated the equipment and a sum of money to the Observatory to continue his work.
WHO classified over 350000 stellar spectral types by themself?
(B) Annie Jump Cannon (1863-1941)in 1929. She personally cataloged over 350,000 stellar spectra.
WHO classified the spectra of 200000 stars?
Williamina Fleming
They also embarked on a massive project to classify the spectra of all stars brighter than about 9th magnitude, more than 200,000 stars. A trio of astronomers, Williamina Fleming, Annie Jump Cannon, and Antonia Maury did most of the classifications.
WHO classified the stars?
Annie Jump Cannon was a female astronomer best known for coming up with the current system of stellar classification. Her system — ranking stars as O, B, A, F, G, K or M, with “O” being the hottest stars and “M” the coolest (the sun is a “G” star) — is still used today.
Who cataloged stars based on their stellar spectrum?
The origin of the Henry Draper Catalogue dates back to the earliest photographic studies of stellar spectra. Henry Draper made the first photograph of a star’s spectrum showing distinct spectral lines when he photographed Vega in 1872. He took over a hundred more photographs of stellar spectra before his death in 1882.
Who was largely responsible for the spectral classification system and the classification of the stars in the HD Catalogue?
Williamina Fleming classified most of the spectra in this catalogue and was credited with classifying over 10,000 featured stars and discovering 10 novae and more than 200 variable stars.
Who discovered stellar spectra?
For the Sun, these were first discovered by Joseph von Fraunhofer in the early 1800s. A sample of stellar spectra is shown in Figure 1….Stellar classification.
| Name | Spectral class | Spectral characteristics |
|---|---|---|
| Hot emission line stars | Of, Be, Ae | Bright hydrogen emission lines |
Where was Annie Cannon born?
Dover, DE
Annie Jump Cannon/Place of birth
What is meant by spectral class?
spectral class noun. any of various groups into which stars are classified according to characteristic spectral lines and bands. The most important classification (Harvard classification) has a series of classes O, B, A, F, G, K, M, the series also being a scale of diminishing surface temperature.
WHO classified over 100000 stars and re arranged the spectral type classification system to the one that is still used by astronomers today?
This work was refined by another Harvard computer, Antonia Maury. “Cannon simplified two earlier schemes into one that astronomers still use today. Her classification had just seven letters arranged by decreasing temperature: OBAFGKM,” wrote Air and Space Smithsonian of her work.
What kind of stars are in the main sequence?
-The diagram shows main-sequence stars of spectral types G, K, and M, along with numerous giants and white dwarfs. -The diagram shows main-sequence stars of all the spectral types except O and B, along with a few giants and supergiants. -The diagram shows no main-sequence stars at all, but it has numerous supergiants and white dwarfs.
How old are all stars in a star cluster?
-All stars in the cluster are approximately at the same stage in evolution. -Most of the stars in the cluster are younger than 10 billion years old. -Most stars in the cluster are yellow or reddish in color. -All stars in the cluster have approximately the same mass. -There is an approximately equal number of all types of stars in the cluster.
How many stars are in a globular cluster?
-Open and globular clusters each typically contain a few hundred stars. -For both open and globular clusters, we can assume that all the stars in a particular cluster are about the same age.
How are all stars in a star cluster alike?
-All stars in the cluster are approximately the same age. -All stars in the cluster have approximately the same mass. -All stars in the cluster will evolve similarly. -There is an approximately equal number of all types of stars in the cluster. -All stars in the cluster are at approximately the same distance from Earth.