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- V1191_Cygni abstract "V1191 Cygni is the variable star designation for an overcontact binary star system in the constellation Cygnus. First found to be variable in 1965, it is a W Ursae Majoris variable with a maximum apparent magnitude 10.82. It drops by 0.33 magnitudes during primary eclipses with a period of 0.3134 days, while dropping by 0.29 magnitudes during secondary eclipses. The primary star, which is also the cooler star, appears to have a spectral type of F6V, while the secondary is slightly cooler with a spectral type of G5V. With a mass of 1.29 solar masses and a luminosity of 2.71 solar luminosities, it is slightly more massive and luminous than the sun, while the secondary is only around 1/10 as massive and less than half as luminous. With a separation of 2.20 solar radii, the mass transfer of about 2×10−7 solar masses per year from the secondary to the primary is one of the highest known for a system of its type.V1191 Cygni is a W-type W UMa variable, meaning that the primary eclipse occurs when the less-massive component is eclipsed by the larger, more massive component, although the masses are unusually different for such a system. The current period is very short for a system of its spectral type, suggesting that the stars are relatively small for their mass and age, which is likely around 3.85 billion years. Interestingly, the pair's orbital period is increasing at a rate of over 4×10−7 days per year, one of the fastest known rates among contact binary systems, likely due to the high rate of mass transfer. In addition to the period increase, there is cyclic period change of 0.023 days over 26.7 years, caused by either a third body with a mass of 0.77 solar masses or magnetic activity cycles. The mass transfer will likely eventually cause the system to evolve into a single star with a very high rotation rate.".
- V1191_Cygni wikiPageID "46179099".
- V1191_Cygni wikiPageLength "9288".
- V1191_Cygni wikiPageOutDegree "23".
- V1191_Cygni wikiPageRevisionID "679471594".
- V1191_Cygni wikiPageWikiLink 2MASS.
- V1191_Cygni wikiPageWikiLink Apparent_magnitude.
- V1191_Cygni wikiPageWikiLink Category:Cygnus_(constellation).
- V1191_Cygni wikiPageWikiLink Category:F-type_main-sequence_stars.
- V1191_Cygni wikiPageWikiLink Category:Objects_named_with_variable_star_designations.
- V1191_Cygni wikiPageWikiLink Category:W_Ursae_Majoris_variables.
- V1191_Cygni wikiPageWikiLink Contact_binary.
- V1191_Cygni wikiPageWikiLink Cygnus_(constellation).
- V1191_Cygni wikiPageWikiLink Guide_Star_Catalog.
- V1191_Cygni wikiPageWikiLink Guide_Star_Catalogue.
- V1191_Cygni wikiPageWikiLink Mass_transfer.
- V1191_Cygni wikiPageWikiLink Overcontact_binary.
- V1191_Cygni wikiPageWikiLink Solar_luminosity.
- V1191_Cygni wikiPageWikiLink Solar_mass.
- V1191_Cygni wikiPageWikiLink Solar_radii.
- V1191_Cygni wikiPageWikiLink Solar_radius.
- V1191_Cygni wikiPageWikiLink Spectral_type.
- V1191_Cygni wikiPageWikiLink Spectroscopic_Binary_Catalogue.
- V1191_Cygni wikiPageWikiLink Star_system.
- V1191_Cygni wikiPageWikiLink Stellar_classification.
- V1191_Cygni wikiPageWikiLink Stellar_magnetic_field.
- V1191_Cygni wikiPageWikiLink Tycho-2_Catalogue.
- V1191_Cygni wikiPageWikiLink Variable_star_designation.
- V1191_Cygni wikiPageWikiLink W_Ursae_Majoris_variable.
- V1191_Cygni wikiPageWikiLinkText "V1191 Cyg".
- V1191_Cygni absmagV "3.82".
- V1191_Cygni absmagV "5.73".
- V1191_Cygni ageGyr "3.85".
- V1191_Cygni appmag "10.06".
- V1191_Cygni appmag "10.55".
- V1191_Cygni appmag "11.41".
- V1191_Cygni appmag "9.51".
- V1191_Cygni appmag "9.56".
- V1191_Cygni appmag "9.82".
- V1191_Cygni appmag1Passband "B".
- V1191_Cygni appmag2Passband "R".
- V1191_Cygni appmag3Passband "I".
- V1191_Cygni appmag4Passband "J".
- V1191_Cygni appmag5Passband "H".
- V1191_Cygni appmag6Passband "K".
- V1191_Cygni appmagV "10.99".
- V1191_Cygni bV "0.62".
- V1191_Cygni class "F6V + G5V".
- V1191_Cygni component "A".
- V1191_Cygni component "B".
- V1191_Cygni constell Cygnus_(constellation).
- V1191_Cygni distPc "278".
- V1191_Cygni epoch "J2000".
- V1191_Cygni gravity "4.12".
- V1191_Cygni gravity "4.31".
- V1191_Cygni hasPhotoCollection V1191_Cygni.
- V1191_Cygni luminosityBolometric "0.46".
- V1191_Cygni luminosityBolometric "2.71".
- V1191_Cygni mass "0.13".
- V1191_Cygni mass "1.29".
- V1191_Cygni periodUnitless "27077.760000000006".
- V1191_Cygni propMoDec "25.1".
- V1191_Cygni propMoRa "38.4".
- V1191_Cygni radius "0.52".
- V1191_Cygni radius "1.31".
- V1191_Cygni temperature "6500".
- V1191_Cygni temperature "6610".
- V1191_Cygni variable W_Ursae_Majoris_variable.
- V1191_Cygni wikiPageUsesTemplate Template:E.
- V1191_Cygni wikiPageUsesTemplate Template:Reflist.
- V1191_Cygni wikiPageUsesTemplate Template:Starbox_astrometry.
- V1191_Cygni wikiPageUsesTemplate Template:Starbox_begin.
- V1191_Cygni wikiPageUsesTemplate Template:Starbox_catalog.
- V1191_Cygni wikiPageUsesTemplate Template:Starbox_character.
- V1191_Cygni wikiPageUsesTemplate Template:Starbox_detail.
- V1191_Cygni wikiPageUsesTemplate Template:Starbox_end.
- V1191_Cygni wikiPageUsesTemplate Template:Starbox_observe.
- V1191_Cygni wikiPageUsesTemplate Template:Starbox_orbit.
- V1191_Cygni wikiPageUsesTemplate Template:Starbox_reference.
- V1191_Cygni wikiPageUsesTemplate Template:Stars_of_Cygnus.
- V1191_Cygni subject Category:Cygnus_(constellation).
- V1191_Cygni subject Category:F-type_main-sequence_stars.
- V1191_Cygni subject Category:Objects_named_with_variable_star_designations.
- V1191_Cygni subject Category:W_Ursae_Majoris_variables.
- V1191_Cygni hypernym Designation.
- V1191_Cygni type CelestialBody.
- V1191_Cygni type Place.
- V1191_Cygni type Star.
- V1191_Cygni type Location.
- V1191_Cygni type Place.
- V1191_Cygni type Thing.
- V1191_Cygni comment "V1191 Cygni is the variable star designation for an overcontact binary star system in the constellation Cygnus. First found to be variable in 1965, it is a W Ursae Majoris variable with a maximum apparent magnitude 10.82. It drops by 0.33 magnitudes during primary eclipses with a period of 0.3134 days, while dropping by 0.29 magnitudes during secondary eclipses.".
- V1191_Cygni label "V1191 Cygni".
- V1191_Cygni sameAs m.0130rn98.
- V1191_Cygni wasDerivedFrom V1191_Cygni?oldid=679471594.
- V1191_Cygni isPrimaryTopicOf V1191_Cygni.
- V1191_Cygni name "V1191 Cygni".