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- Algol_variable abstract "Algol variables or Algol-type binaries are a class of eclipsing binary stars that are related to the prototype member of this class, β Persei (Beta Persei, Algol) from an evolutionary point of view. An Algol binary is a semidetached binary system where the primary component is an early type, main sequence star that does not fill its Roche lobe, while the cooler, fainter, larger, less massive secondary component lies above the main sequence in a Hertzsprung–Russell diagram and fills the Roche lobe. Early in its history, the secondary star would have been more massive, evolving first to overfill its Roche lobe. After rapid mass exchange, the lobe-filling star became less massive than its companion.When the cooler component passes in front of the hotter one, part of the latter's light is blocked, and the total brightness of the binary, as viewed from Earth, temporarily decreases. This is the primary minimum of the binary. Total brightness may also decrease, but less so, when the hotter component passes in front of the cooler one; this is the secondary minimum.The period, or time span between two primary minima, is very regular over moderate periods of time (months to years), being determined by the revolution period of the binary, the time it takes for the two components to once orbit around each other. Most Algol variables are quite close binaries, and therefore their periods are short, typically a few days. The shortest known period is 0.1167 days (~2:48 hours, HW Virginis); the longest is 9892 days (27 years, Epsilon Aurigae). Over long periods of time, various effects can cause the period to vary: in some Algol binaries, mass transfer between the closely spaced components of the variable may cause monotonic increases in period; if one component of the pair is magnetically active, the Applegate mechanism may cause recurrent changes in period on the order of ∆P/P ≈ 10−5; magnetic braking or the effects of a third component star in a highly eccentric orbit can cause larger changes in period.Component stars of Algol binary systems have a spherical, or slightly ellipsoidal shape. This distinguishes them from the so-called beta Lyrae variables and W Ursae Majoris variables, where the two components are so close that gravitational effects lead to serious deformations of both stars.Generally the amplitudes of the brightness variations are of the order of one magnitude, the largest variation known being 3.4 magnitudes (V342 Aquilae). The components may have any spectrum, though in most cases the brighter component is found to have B, A, F, or G spectra.Algol itself, the prototype of this type of variable star, Bayer designation Beta Persei, first had its variability recorded in 1667 by Geminiano Montanari. The mechanism for its being variable was first correctly explained by John Goodricke in 1782.Many thousands of Algol binaries are now known: the latest edition of the General Catalogue of Variable Stars (2003) lists 3,554 of them (9% of all variable stars).DM = A detached main-sequence system. Both components are main-sequence stars and neither fills their inner Roche lobeDS = A detached system with a subgiant. The subgiant does not fill its inner critical surfaceGS = A system with one or both giant and supergiant components; one of the components may be a main sequence starKE = A contact system of early (O-A) spectral type, both components being close in size to their inner critical surfaces.↑ ↑ ↑ ↑".
- Algol_variable wikiPageExternalLink ebstar.html.
- Algol_variable wikiPageExternalLink gcvs.
- Algol_variable wikiPageID "4533397".
- Algol_variable wikiPageLength "8682".
- Algol_variable wikiPageOutDegree "72".
- Algol_variable wikiPageRevisionID "682192132".
- Algol_variable wikiPageWikiLink 68_Herculis.
- Algol_variable wikiPageWikiLink Algol.
- Algol_variable wikiPageWikiLink Alpha_Coronae_Borealis.
- Algol_variable wikiPageWikiLink Amplitude.
- Algol_variable wikiPageWikiLink Apparent_magnitude.
- Algol_variable wikiPageWikiLink Applegate_mechanism.
- Algol_variable wikiPageWikiLink Auriga_(constellation).
- Algol_variable wikiPageWikiLink BL_Telescopii.
- Algol_variable wikiPageWikiLink Baxendell.
- Algol_variable wikiPageWikiLink Bayer_designation.
- Algol_variable wikiPageWikiLink Beta_Lyrae_variable.
- Algol_variable wikiPageWikiLink Binary_star.
- Algol_variable wikiPageWikiLink Brightness.
- Algol_variable wikiPageWikiLink Cancer_(constellation).
- Algol_variable wikiPageWikiLink Canis_Major.
- Algol_variable wikiPageWikiLink Category:Algol_variables.
- Algol_variable wikiPageWikiLink Category:Binary_stars.
- Algol_variable wikiPageWikiLink Category:Eclipsing_binaries.
- Algol_variable wikiPageWikiLink Category:Variable_stars.
- Algol_variable wikiPageWikiLink Cepheus_(constellation).
- Algol_variable wikiPageWikiLink Corona_Borealis.
- Algol_variable wikiPageWikiLink Earth.
- Algol_variable wikiPageWikiLink Eclipse.
- Algol_variable wikiPageWikiLink Epsilon_Aurigae.
- Algol_variable wikiPageWikiLink Frequency.
- Algol_variable wikiPageWikiLink Geminiano_Montanari.
- Algol_variable wikiPageWikiLink Gravity.
- Algol_variable wikiPageWikiLink HW_Virginis.
- Algol_variable wikiPageWikiLink Hercules_(constellation).
- Algol_variable wikiPageWikiLink Hertzsprung–Russell_diagram.
- Algol_variable wikiPageWikiLink Hydra_(constellation).
- Algol_variable wikiPageWikiLink J.H._Fritsch.
- Algol_variable wikiPageWikiLink John_Goodricke.
- Algol_variable wikiPageWikiLink John_Herschel.
- Algol_variable wikiPageWikiLink John_Russell_Hind.
- Algol_variable wikiPageWikiLink Lambda_Tauri.
- Algol_variable wikiPageWikiLink Magnetic_braking.
- Algol_variable wikiPageWikiLink Main_sequence.
- Algol_variable wikiPageWikiLink Mass_transfer.
- Algol_variable wikiPageWikiLink Mintaka.
- Algol_variable wikiPageWikiLink Orbit.
- Algol_variable wikiPageWikiLink Orion_(constellation).
- Algol_variable wikiPageWikiLink Perseus.
- Algol_variable wikiPageWikiLink Perseus_(constellation).
- Algol_variable wikiPageWikiLink Phoenix_(constellation).
- Algol_variable wikiPageWikiLink R_Canis_Majoris.
- Algol_variable wikiPageWikiLink Roche_lobe.
- Algol_variable wikiPageWikiLink S_Cancri.
- Algol_variable wikiPageWikiLink Sagitta.
- Algol_variable wikiPageWikiLink Sphere.
- Algol_variable wikiPageWikiLink Stellar_classification.
- Algol_variable wikiPageWikiLink Taurus_(constellation).
- Algol_variable wikiPageWikiLink Telescopium.
- Algol_variable wikiPageWikiLink U_Cephei.
- Algol_variable wikiPageWikiLink U_Coronae_Borealis.
- Algol_variable wikiPageWikiLink U_Sagittae.
- Algol_variable wikiPageWikiLink V342_Aquilae.
- Algol_variable wikiPageWikiLink VV_Orionis.
- Algol_variable wikiPageWikiLink VW_Hydrae.
- Algol_variable wikiPageWikiLink Variable_star.
- Algol_variable wikiPageWikiLink W_Ursae_Majoris_variable.
- Algol_variable wikiPageWikiLink Willem_Jacob_Luyten.
- Algol_variable wikiPageWikiLink Zeta_Phoenicis.
- Algol_variable wikiPageWikiLinkText "(Algol-type)".
- Algol_variable wikiPageWikiLinkText "Algol type".
- Algol_variable wikiPageWikiLinkText "Algol variable".
- Algol_variable wikiPageWikiLinkText "Algol".
- Algol_variable wikiPageWikiLinkText "Algol-type binaries".
- Algol_variable wikiPageWikiLinkText "Algol-type eclipsing binary".
- Algol_variable wikiPageWikiLinkText "Algol-type".
- Algol_variable wikiPageWikiLinkText "EA".
- Algol_variable wikiPageWikiLinkText "EA/SD".
- Algol_variable wikiPageUsesTemplate Template:Dynamic_list.
- Algol_variable wikiPageUsesTemplate Template:Nts.
- Algol_variable wikiPageUsesTemplate Template:Ntsh.
- Algol_variable wikiPageUsesTemplate Template:Reflist.
- Algol_variable wikiPageUsesTemplate Template:Variable_star_topics.
- Algol_variable subject Category:Algol_variables.
- Algol_variable subject Category:Binary_stars.
- Algol_variable subject Category:Eclipsing_binaries.
- Algol_variable subject Category:Variable_stars.
- Algol_variable hypernym Stars.
- Algol_variable type Animal.
- Algol_variable type Variable.
- Algol_variable type Concept.
- Algol_variable comment "Algol variables or Algol-type binaries are a class of eclipsing binary stars that are related to the prototype member of this class, β Persei (Beta Persei, Algol) from an evolutionary point of view.".
- Algol_variable label "Algol variable".
- Algol_variable sameAs Q24452.
- Algol_variable sameAs Variable_Algol.
- Algol_variable sameAs Zákrytová_dvojhvězda.
- Algol_variable sameAs Algolstern.
- Algol_variable sameAs Algol-muuttuja.
- Algol_variable sameAs Étoile_variable_de_type_Algol.