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- W_Ursae_Majoris_variable abstract "A W Ursae Majoris variable is a type of eclipsing binary variable star. These stars are close binaries of spectral types F, G, or K that share a common envelope of material and are thus in contact with one another. They are termed contact binaries because the two stars touch and transfer mass and energy through the connecting neck, although astronomer R.E. Wilson argues that the term "overcontact" is more appropriate.W Ursae Majoris variables are the most common variable stars in the present day Universe. About 1 percent of all stars belong to this group.The class is divided into two subclasses: A-type and W-type (L. Binnendijk, Veroeffentlichungen der Remeis-Sternwarte zu Bamberg, Nr. 40., p. 36, 1965) A-type W UMa binaries are composed of two stars both hotter than the Sun, having spectral types A or F, and periods of 0.4 to 0.8 day. The W-types have cooler spectral types of G or K and shorter periods of 0.22 to 0.4 day. The difference between the surface temperatures of the components is less than several hundred kelvins. A new subclass was introduced in 1978: B-type. The B-types have larger surface temperature difference. In 2004 the H (high mass ratio) systems were discovered by Sz. Csizmadia and P. Klagyivik (Astronomy and Astrophysics, Vol. 426, pp. 1001–1005 (2004)). The H-types have a higher mass ratio than (= (secondary's mass)/(primary's mass)) and they have extra angular momentum.These stars were first shown to follow a period-color relation (shorter period systems are redder) by Eggen. In 2012, Terrell, Gross and Cooney published a color-survey of 606 W UMa systems in the Johnson-Cousins photometric system.Their light curves differ from those of classical eclipsing binaries, undergoing a constant ellipsoidal variation rather than discrete eclipses. This is because the stars are gravitationally distorted by one another, and thus the projected area of the stars is constantly changing. The depths of the brightness minima are usually equal because both stars have nearly equal surface temperatures.W Ursae Majoris is the prototype of this class.".
- W_Ursae_Majoris_variable wikiPageID "2705353".
- W_Ursae_Majoris_variable wikiPageRevisionID "565676912".
- W_Ursae_Majoris_variable hasPhotoCollection W_Ursae_Majoris_variable.
- W_Ursae_Majoris_variable subject Category:Binary_stars.
- W_Ursae_Majoris_variable subject Category:Common_envelope_binary_stars.
- W_Ursae_Majoris_variable subject Category:Eclipsing_binaries.
- W_Ursae_Majoris_variable subject Category:Variable_stars.
- W_Ursae_Majoris_variable subject Category:W_Ursae_Majoris_variables.
- W_Ursae_Majoris_variable type BinaryStar109221070.
- W_Ursae_Majoris_variable type BinaryStars.
- W_Ursae_Majoris_variable type CelestialBody109239740.
- W_Ursae_Majoris_variable type CommonEnvelopeBinaryStars.
- W_Ursae_Majoris_variable type EclipsingBinaries.
- W_Ursae_Majoris_variable type NaturalObject100019128.
- W_Ursae_Majoris_variable type Object100002684.
- W_Ursae_Majoris_variable type PhysicalEntity100001930.
- W_Ursae_Majoris_variable type Star109444100.
- W_Ursae_Majoris_variable type Thing100002452.
- W_Ursae_Majoris_variable type Variable109468959.
- W_Ursae_Majoris_variable type VariableStar109469152.
- W_Ursae_Majoris_variable type VariableStars.
- W_Ursae_Majoris_variable type WUrsaeMajorisVariables.
- W_Ursae_Majoris_variable type Whole100003553.
- W_Ursae_Majoris_variable comment "A W Ursae Majoris variable is a type of eclipsing binary variable star. These stars are close binaries of spectral types F, G, or K that share a common envelope of material and are thus in contact with one another. They are termed contact binaries because the two stars touch and transfer mass and energy through the connecting neck, although astronomer R.E.".
- W_Ursae_Majoris_variable label "Estrella variable W Ursae Majoris".
- W_Ursae_Majoris_variable label "Gwiazdy zmienne typu W UMa".
- W_Ursae_Majoris_variable label "Variabile W Ursae Majoris".
- W_Ursae_Majoris_variable label "W Ursae Majoris variable".
- W_Ursae_Majoris_variable label "W-Ursae-Majoris-Stern".
- W_Ursae_Majoris_variable label "Étoile variable de type W Ursae Majoris".
- W_Ursae_Majoris_variable label "Переменная типа W Большой Медведицы".
- W_Ursae_Majoris_variable label "おおぐま座W型変光星".
- W_Ursae_Majoris_variable label "大熊座W型變星".
- W_Ursae_Majoris_variable sameAs W-Ursae-Majoris-Stern.
- W_Ursae_Majoris_variable sameAs Estrella_variable_W_Ursae_Majoris.
- W_Ursae_Majoris_variable sameAs Étoile_variable_de_type_W_Ursae_Majoris.
- W_Ursae_Majoris_variable sameAs Variabile_W_Ursae_Majoris.
- W_Ursae_Majoris_variable sameAs おおぐま座W型変光星.
- W_Ursae_Majoris_variable sameAs Gwiazdy_zmienne_typu_W_UMa.
- W_Ursae_Majoris_variable sameAs m.07z3ng.
- W_Ursae_Majoris_variable sameAs Q691269.
- W_Ursae_Majoris_variable sameAs Q691269.
- W_Ursae_Majoris_variable sameAs W_Ursae_Majoris_variable.
- W_Ursae_Majoris_variable wasDerivedFrom W_Ursae_Majoris_variable?oldid=565676912.
- W_Ursae_Majoris_variable isPrimaryTopicOf W_Ursae_Majoris_variable.