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Cepheid variable

Index Cepheid variable

A Cepheid variable is a type of star that pulsates radially, varying in both diameter and temperature and producing changes in brightness with a well-defined stable period and amplitude. [1]

64 relations: Absolute magnitude, Andromeda Galaxy, Arthur Eddington, Beta Doradus, BL Boötis, BL Herculis variable, Blue straggler, Cepheus (constellation), Classical Cepheid variable, Cosmic distance ladder, Delta Cephei, Delta Scuti variable, Edward Pigott, Edwin Hubble, Ejnar Hertzsprung, Eta Aquilae, Expansion of the universe, Frequency, Galactic Center, Galaxy, Georges Lemaître, Globular cluster, Great Debate (astronomy), Harlow Shapley, HD 84810, Helium, Henrietta Swan Leavitt, Hipparcos, Horizontal branch, Hubble Space Telescope, Hubble's law, Instability strip, Ionization, John Goodricke, Kappa mechanism, Local Group, Luminosity, Magellanic Clouds, Mass transfer, Metallicity, Milky Way, Milton L. Humason, Monthly Notices of the Royal Astronomical Society, Passband, Periodic function, Polaris, RR Lyrae variable, RS Puppis, RT Aurigae, RV Tauri variable, ..., Sergei Alexandrovich Zhevakin, Sine wave, Star, Star cluster, Stellar classification, Stellar population, Stellar pulsation, Type II Cepheid, Variable star, Vesto Slipher, W Virginis, W Virginis variable, Walter Baade, Zeta Geminorum. Expand index (14 more) »

Absolute magnitude

Absolute magnitude is a measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale.

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Andromeda Galaxy

The Andromeda Galaxy, also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth, and the nearest major galaxy to the Milky Way.

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Arthur Eddington

Sir Arthur Stanley Eddington (28 December 1882 – 22 November 1944) was an English astronomer, physicist, and mathematician of the early 20th century who did his greatest work in astrophysics.

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Beta Doradus

Beta Doradus (Beta Dor, β Doradus, β Dor) is the second brightest star in the southern constellation of Dorado.

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BL Boötis

BL Boötis (abbreviated to BL Boo) is a pulsating variable star in the constellation Boötes.

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BL Herculis variable

BL Herculis variables are a type of variable star with low luminosity and mass that have a period of less than eight days.

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Blue straggler

A blue straggler is a main-sequence star in an open or globular cluster that is more luminous and bluer than stars at the main-sequence turn-off point for the cluster.

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Cepheus (constellation)

Cepheus is a constellation in the northern sky, which is named after Cepheus (a King in the Greek mythology).

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Classical Cepheid variable

Classical Cepheids (also known as Population I Cepheids, Type I Cepheids, or Delta Cephei variables) are a type of Cepheid variable star.

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Cosmic distance ladder

The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects.

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Delta Cephei

Delta Cephei (δ Cep, δ Cephei) is the Bayer designation for a quadruple star system located approximately 887 light-years away in the northern circumpolar constellation of Cepheus, the King.

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Delta Scuti variable

A Delta Scuti variable (sometimes termed dwarf cepheid) is a variable star which exhibits variations in its luminosity due to both radial and non-radial pulsations of the star's surface.

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Edward Pigott

Edward Pigott (1753–1825) was an English astronomer.

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Edwin Hubble

Edwin Powell Hubble (November 20, 1889 – September 28, 1953) was an American astronomer.

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Ejnar Hertzsprung

Ejnar Hertzsprung (8 October 1873 – 21 October 1967) was a Danish chemist and astronomer born in Copenhagen.

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Eta Aquilae

Eta Aquilae (η Aql, η Aquilae) is the Bayer designation for a multiple star in the equatorial constellation of Aquila, the eagle.

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Expansion of the universe

The expansion of the universe is the increase of the distance between two distant parts of the universe with time.

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Frequency

Frequency is the number of occurrences of a repeating event per unit of time.

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Galactic Center

The Galactic Center is the rotational center of the Milky Way.

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Galaxy

A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.

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Georges Lemaître

Georges Henri Joseph Édouard Lemaître, RAS Associate (17 July 1894 – 20 June 1966) was a Belgian Catholic Priest, astronomer and professor of physics at the Catholic University of Leuven.

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Globular cluster

A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.

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Great Debate (astronomy)

The Great Debate, also called the Shapley–Curtis Debate, was held on 26 April 1920 at the Smithsonian Museum of Natural History, between the astronomers Harlow Shapley and Heber Curtis.

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Harlow Shapley

Harlow Shapley (November 2, 1885 – October 20, 1972) was a 20th-century American scientist, head of the Harvard College Observatory (1921–1952), and political activist during the latter New Deal and Fair Deal.

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HD 84810

HD 84810, also known as l Carinae (l Car), is a star in the southern constellation of Carina.

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Helium

Helium (from lit) is a chemical element with symbol He and atomic number 2.

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Henrietta Swan Leavitt

Henrietta Swan Leavitt (July 4, 1868 – December 12, 1921) was an American astronomer who discovered the relation between the luminosity and the period of Cepheid variable stars.

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Hipparcos

Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.

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Horizontal branch

The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red giant branch in stars whose masses are similar to the Sun's.

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Hubble Space Telescope

The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.

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Hubble's law

Hubble's law is the name for the observation in physical cosmology that.

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Instability strip

The unqualified term instability strip usually refers to a region of the Hertzsprung–Russell diagram largely occupied by several related classes of pulsating variable stars: Delta Scuti variables, SX Phoenicis variables, and rapidly oscillating Ap stars (roAps) near the main sequence; RR Lyrae variables where it intersects the horizontal branch; and the Cepheid variables where it crosses the supergiants.

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Ionization

Ionization or ionisation, is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.

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John Goodricke

John Goodricke FRS (17 September 1764 – 20 April 1786) was an English amateur astronomer.

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Kappa mechanism

The κ–mechanism is the driving mechanism behind the changes in luminosity of many types of pulsating variable stars.

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Local Group

The Local Group is the galaxy group that includes the Milky Way.

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Luminosity

In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object.

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Magellanic Clouds

The Magellanic Clouds (or Nubeculae Magellani) are two irregular dwarf galaxies visible in the Southern Celestial Hemisphere; they are members of the Local Group and are orbiting the Milky Way galaxy.

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Mass transfer

Mass transfer is the net movement of mass from one location, usually meaning stream, phase, fraction or component, to another.

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Metallicity

In astronomy, metallicity is used to describe the abundance of elements present in an object that are heavier than hydrogen or helium.

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Milky Way

The Milky Way is the galaxy that contains our Solar System.

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Milton L. Humason

Milton La Salle Humason (August 19, 1891 – June 18, 1972) was an American astronomer.

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Monthly Notices of the Royal Astronomical Society

Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.

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Passband

A passband is the range of frequencies or wavelengths that can pass through a filter.

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Periodic function

In mathematics, a periodic function is a function that repeats its values in regular intervals or periods.

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Polaris

Polaris, designated Alpha Ursae Minoris (Ursae Minoris, abbreviated Alpha UMi, UMi), commonly the North Star or Pole Star, is the brightest star in the constellation of Ursa Minor.

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RR Lyrae variable

RR Lyrae variables are periodic variable stars, commonly found in globular clusters.

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RS Puppis

RS Puppis (or RS Pup) is a Cepheid variable star in the constellation of Puppis.

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RT Aurigae

RT Aurigae (RT Aur, 48 Aurigae) is a yellow supergiant variable star in the constellation Auriga, about 1,500 light years from Earth.

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RV Tauri variable

RV Tauri variables are luminous variable stars that have distinctive light variations with alternating deep and shallow minima.

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Sergei Alexandrovich Zhevakin

Sergei Alexandrovich Zhevakin (Серге́й Александрович Жевакин) (April 11, 1916 – February 21, 2001) was a Russian astronomer.

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Sine wave

A sine wave or sinusoid is a mathematical curve that describes a smooth periodic oscillation.

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Star

A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.

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Star cluster

Star clusters are groups of stars.

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Stellar classification

In astronomy, stellar classification is the classification of stars based on their spectral characteristics.

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Stellar population

During 1944, Walter Baade categorized groups of stars within the Milky Way into bluer stars associated with the spiral arms and the general position of yellow stars near the central galactic bulge or within globular star clusters.

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Stellar pulsation

Stellar pulsations are caused by expansions and contractions in the outer layers as a star seeks to maintain equilibrium.

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Type II Cepheid

Type II Cepheids are variable stars which pulsate with periods typically between 1 and 50 days.

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Variable star

A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.

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Vesto Slipher

Vesto Melvin Slipher (November 11, 1875 – November 8, 1969) was an American astronomer who performed the first measurements of radial velocities for galaxies, providing the empirical basis for the expansion of the universe.

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W Virginis

W Virginis is the prototype W Virginis variable, a subclass of the Cepheid variable stars.

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W Virginis variable

W Virginis variables are a subclass of Type II Cepheids which exhibit pulsation periods between 10–20 days,Wallerstein, G.,, Publications of the Astronomical Society of the Pacific, 114 p.689–699 (2002) and are of spectral class F6 – K2.

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Walter Baade

Wilhelm Heinrich Walter Baade (March 24, 1893 – June 25, 1960) was a German astronomer who worked in the United States from 1931 to 1959.

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Zeta Geminorum

Zeta Geminorum (ζ Geminorum, abbreviated Zeta Gem, ζ Gem) is a star (possibly binary) in the zodiac constellation of Gemini, on the outstretched left 'leg' of the twin Pollux.

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Anomalous Cepheid, Cepheid, Cepheid Variable, Cepheid Variable Stars, Cepheid Variables, Cepheid variable star, Cepheid variable stars, Cepheid variables, Cepheids, Cephid, Cephid variable, Delta Cepheid, Delta Cepheid star, Henrietta's law, Leavitt's law, Period-luminosity relationship.

References

[1] https://en.wikipedia.org/wiki/Cepheid_variable

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