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Delta Cephei is also of particular importance as a calibrator of the Cepheid period-luminosity relation since its distance is among the most precisely established for a Cepheid, thanks in part to its membership in a star cluster and the availability of precise Hubble Space Telescope / Hipparcos parallaxes.
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Delta and Cephei
John Goodricke himself discovered Delta Cephei and Beta Lyrae.
Classical Cepheids ( or Delta Cephei variables ) are population I yellow supergiants which undergo pulsations with very regular periods on the order of days to months.
However, the namesake for classical Cepheids is the star Delta Cephei, discovered to be variable by John Goodricke a few months later.
* KUI 91AB, a variable star of Delta Cephei type
The term cepheid originates from Delta Cephei in the constellation Cepheus, the first star of this type identified, by John Goodricke in 1784.
Classical Cepheids ( also known as Population I Cepheids, Type I Cepheids, or Delta Cephei variables ) undergo pulsations with very regular periods on the order of days to months.
However, the namesake for classical Cepheids is the star Delta Cephei, discovered to be variable by John Goodricke a few months later.
* Classical Cepheids include: Eta Aquilae, Zeta Geminorum, Beta Doradus, RT Aurigae, Polaris, as well as the namesake Delta Cephei.
In 1908, the results of her study were published, which showed that a type of variable star called a " cluster variable ", later called a Cepheid variable after the prototype star Delta Cephei, showed a definite relationship between the variability period and the star's luminosity.
* Delta Cephei, a Cepheid variable
The Cepheids are a class of pulsating variable stars ; Delta Cephei has a minimum size of 40 solar diameters and a maximum size of 46 solar diameters.
A Delta Cephei type variable star designated U Sagittarii is a member of this cluster.
The periodic variation in radial velocity was subsequently explained as the result of radial pulsations that occur in a class of variable stars known as Cepheid variables — named after Delta Cephei.
Delta Cephei, the prototypical classical Cepheid variables, is also a member of a star cluster.
Delta Crucis is a strong candidate Beta Cephei variable and changes its brightness subtly with a period of 1. 3 hours.
Cephei, Delta
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Delta and is
Her husband, who is the son of Alton John Mason of Shreveport, La., and the late Mrs. Henry Cater Parmer, was president of Alpha Tau Omega and a member of Delta Sigma Pi at Lamar Tech, and did graduate work at Rhodes University in Grahamstown, South Africa, on a Rotary Fellowship.
Mr. Wall is a student at Tulane university, where he is a member of Delta Kappa Epsilon fraternity.
Also in Aquarius is Loui-pi-tchin, the ramparts that stretch from 29 and 27 Piscium and 33 and 30 Aquarii through Phi, Lambda, Sigma, and Iota Aquarii to Delta, Gamma, Kappa, and Epsilon Capricorni.
During the 5th year of Pharaoh Merneptah, a confederation of Libyan and northern peoples is supposed to have attacked the Western Delta.
The Okavango Delta, the world's largest inland delta, is in the northwest and the Makgadikgadi Pans, a large salt pan lies in the north-central area.
Khmer Krom or Southern Khmer is spoken by the indigenous Khmer population of the Mekong Delta, formerly controlled by the Khmer Empire but part of Vietnam since 1698.
To the southeast of this great basin is the Mekong Delta, which extends through Vietnam to the South China Sea.
Pagan Publishing has released a series of supplements in a similar vein, by the name Delta Green, that is set in the 1990s ( although later supplements add support for playing closer to the present day ).
The city is along the Nile River, immediately south of the point where the river leaves its desert-bound valley and branches into the low-lying Nile Delta region.
Delta Crucis is a blue-white hued star of magnitude 2. 8, 364 light-years from Earth.
Of these, the brightest is Messier 77 ( NGC 1068 ), a 9th magnitude spiral galaxy near Delta Ceti.
Delta Cygni is another bright binary star in Cygnus, 171 light-years with a period of 800 years.
The other bright star in Chamaeleon is Delta Chamaeleontis, a wide double star.
The brighter star is Delta < sup > 2 </ sup > Chamaeleontis, a blue-hued star of magnitude 4. 4, 364 light-years from Earth.
Delta < sup > 1 </ sup > Chamaeleontis, the dimmer component, is an orange-hued giant star of magnitude 5. 5, 354 light-years away.
The city is also served by Delta Air Lines at Columbia Regional Airport, the only commercial airport in mid-Missouri.
where the symbol Δ ( the uppercase form of the Greek letter Delta ) is an abbreviation for " change in.
Delta ( uppercase Δ, lowercase δ ; Délta ; Modern Greek ) is the fourth letter of the Greek alphabet.
Delta is commonly used in the subject science and mathematics and is used to describe change in energy.
is: Delta
The main asterism in Delphinus is Job's Coffin, formed from the four brightest stars: Alpha, Beta, Gamma, and Delta Delphini.
Delta Delphini is a type A7 IIIp star of magnitude 4. 43.
* 1899 – Delta Sigma Phi Fraternity is founded at the City College of New York.
0.210 seconds.