单词 HARVARD CLASSIFICATION的词源
Named after the observatory at Harvard, Massachusetts, where it was prepared and published as part of The Henry Draper Catalogue (1924).
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1
The Cosmic Century: A History of Astrophysics and Cosmology
... 1913a) – the Pickering series resulted from transitions from energy levels with
principal quantum numbers n > 4 into the n = 4 level. The most famous work
which led to the standard Harvard classification was carried out by Annie Cannon
.
2
Discovery and
Classification in Astronomy: Controversy and ...
It took fifty years for a negotiated consensus to appear at the meeting of the
International Solar Union in 1910, and DeVorkin concludes that by 1921, “mainly
through inertia, the Harvard Classification did become the universal standard” ...
3
Encyclopedia of Space and Astronomy
288 Harvard classification system trajectory assure high survivability and
effectiveness. This missile is capable of being launched from surface ships,
submarines, or (without its booster component) from aircraft. Originally developed
for the U.S. ...
4
The Chosen: The Hidden History of Admission and Exclusion at ...
... as a consideration in determining who could come to Harvard. Classification
and Power In assessing the 5,000-7,000 applicants competing annually for just
1,400- 1,500 slots, the Admissions Office used a complex system of classification
to ...
The Harvard classification is based on lines that are mainly sensitive to the stellar
temperature, rather than to gravity or luminosity. Important lines are the hydrogen
Balmer lines, the lines of neutral helium, the iron lines, the H and K doublet of ...
6
The Astrophysics of Emission-Line Stars
2.1.3 Spectral classification Harvard classification The Harvard classification
arranges the spectral types based on the relative strengths of absorption lines as
follows: R- N / O-B- A-F-G-K-M \ S Each spectral type has 10 subtypes signified
by ...
Tomokazu Kogure, Kam-Ching Leung, 2010
7
The
Classification of Stars
Harvard astronomers started by using groups labelled A, B, C, D, . . . ; the order O
- B - A-F-G-K-M used today shows that lengthy process of simplification and
reaccommodation of groups has taken place. That the Harvard classification has
...
Carlos Jaschek, Mercedes Jaschek, 1990
In the 1890s, astronomers at the Harvard College Observatory (HCO) introduced
a system of letters that corresponded to different types of stars, based on the
stellar spectral lines. The Harvard classification system corresponded roughly to
the ...
9
Introduction To Astrophysics, 2/e
The Harvard classification recognized only the classes O, B, A, F, G, K and M and
they recognized these classes to be a high to low temperature sequence.
However, the Harvard astrophysicists developed the remarkable criterion through
...
Basu, Baidyanath, chattopadhyay Tanuka
10
The Analysis of Starlight: Two Centuries of Astronomical ...
5.8 ANNIE CANNON AND THE HARVARD CLASSIFICATION OF 1901 Antonia
Maury's spectral work was exclusively north of −30◦, and the remaining quarter of
the sky was there- fore still awaiting a detailed investigation of its brighter stars.
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Annie Jump Cannon: 5 Fast Facts You Need to Know
She's known for creating the Harvard Classification Scheme, which classifies stars based on their temperatures. Here's what you need to know: ... «Heavy.com, 十二月 14»
Computing Power Used to Be Measured in 'Kilo-Girls'
Annie Jump Canon, one of Pickering's hires, used astronomical calculations to develop the Harvard Classification Scheme. Another computer ... «The Atlantic, 十月 13»
