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- RR_Centauri abstract "RR Centauri is a variable star of apparent magnitude maximum +7.29. It is located in the constellation of Centaurus, approximately 320 light years distant from the solar system.The system is a contact binary of the W UMa type - two stars in physical contact whose two components share a gaseous envelope. Its spectral type is A9V or F0V. The binary nature of the star was discovered in 1896 by the Scottish-South African astronomer Alexander Roberts, so the system has been well observed for over a century. The primary component has a mass of 1.82 solar masses, an effective temperature of around 6900 K, and a radius somewhat larger than twice the solar radius. The secondary component is 0.39 solar masses, giving a mass ratio of the system (q) of 0.210. the secondary has a temperature of about 6890 K and a radius is almost equal to the solar radius. The orbital period of this system is 0.6057 days (14.53 hours). Recent calculations by astronomers from the Chinese Academy of Sciences show a possible cyclic variation in orbital period over 65.1 ± 0.4 years whose amplitude is 0.0124 ± 0.0007 days. The origin of this periodic variation could be due to the gravitational influence of a third object yet observed. Superimposed on this variation seems to be a secular increase in the period of 1.21 x 10 -7 days per year, suggesting that there is transfer of stellar mass from secondary to primary component. If this increase is confirmed, RR Centauri may evolve into a single rapidly rotating star.RR Centauri is also an eclipsing binary, whose apparent brightness varies by around 0.41 magnitudes.".
- RR_Centauri thumbnail RR_Cen_Eclipse_Phase.png?width=300.
- RR_Centauri wikiPageID "49576522".
- RR_Centauri wikiPageLength "7185".
- RR_Centauri wikiPageOutDegree "19".
- RR_Centauri wikiPageRevisionID "707927514".
- RR_Centauri wikiPageWikiLink 2MASS.
- RR_Centauri wikiPageWikiLink Alexander_William_Roberts.
- RR_Centauri wikiPageWikiLink Category:2MASS_objects.
- RR_Centauri wikiPageWikiLink Category:F-type_main-sequence_stars.
- RR_Centauri wikiPageWikiLink Category:Henry_Draper_Catalogue_objects.
- RR_Centauri wikiPageWikiLink Category:Hipparcos_objects.
- RR_Centauri wikiPageWikiLink Category:Objects_named_with_variable_star_designations.
- RR_Centauri wikiPageWikiLink Category:W_Ursae_Majoris_variables.
- RR_Centauri wikiPageWikiLink Centaurus.
- RR_Centauri wikiPageWikiLink File:RR_Cen_Eclipse_Phase.png.
- RR_Centauri wikiPageWikiLink Henry_Draper_Catalogue.
- RR_Centauri wikiPageWikiLink Hipparcos.
- RR_Centauri wikiPageWikiLink Smithsonian_Astrophysical_Observatory_Star_Catalog.
- RR_Centauri wikiPageWikiLink Tycho-2_Catalogue.
- RR_Centauri wikiPageWikiLink Variable_star.
- RR_Centauri wikiPageWikiLink Variable_star_designation.
- RR_Centauri wikiPageWikiLink W_Ursae_Majoris_variable.
- RR_Centauri absmagV "+1.882".
- RR_Centauri appmagV "7.29".
- RR_Centauri bV "+0.36".
- RR_Centauri class "F0 V".
- RR_Centauri component "RR Cen1".
- RR_Centauri component "RR Cen2".
- RR_Centauri constell Centaurus.
- RR_Centauri eccentricity "0".
- RR_Centauri epoch "J2000".
- RR_Centauri inclination "81".
- RR_Centauri luminosity "2.2".
- RR_Centauri luminosity "8.89".
- RR_Centauri mass "0.38".
- RR_Centauri mass "1.82".
- RR_Centauri name "RR Cen2".
- RR_Centauri pError "0.61".
- RR_Centauri parallax "10.16".
- RR_Centauri periodUnitless "52331.615999999995".
- RR_Centauri primary "RR Cen1".
- RR_Centauri propMoDec "-22.63".
- RR_Centauri propMoRa "-52".
- RR_Centauri radialV "-16".
- RR_Centauri radius "1.05".
- RR_Centauri radius "2.1".
- RR_Centauri temperature "6891".
- RR_Centauri temperature "6912".
- RR_Centauri uB "+0.05".
- RR_Centauri variable W_Ursae_Majoris_variable.
- RR_Centauri wikiPageUsesTemplate Template:DEC.
- RR_Centauri wikiPageUsesTemplate Template:RA.
- RR_Centauri wikiPageUsesTemplate Template:Reflist.
- RR_Centauri wikiPageUsesTemplate Template:Solar_radius.
- RR_Centauri wikiPageUsesTemplate Template:Starbox_astrometry.
- RR_Centauri wikiPageUsesTemplate Template:Starbox_begin.
- RR_Centauri wikiPageUsesTemplate Template:Starbox_catalog.
- RR_Centauri wikiPageUsesTemplate Template:Starbox_character.
- RR_Centauri wikiPageUsesTemplate Template:Starbox_detail.
- RR_Centauri wikiPageUsesTemplate Template:Starbox_end.
- RR_Centauri wikiPageUsesTemplate Template:Starbox_image.
- RR_Centauri wikiPageUsesTemplate Template:Starbox_observe.
- RR_Centauri wikiPageUsesTemplate Template:Starbox_orbit.
- RR_Centauri wikiPageUsesTemplate Template:Starbox_reference.
- RR_Centauri subject Category:2MASS_objects.
- RR_Centauri subject Category:F-type_main-sequence_stars.
- RR_Centauri subject Category:Henry_Draper_Catalogue_objects.
- RR_Centauri subject Category:Hipparcos_objects.
- RR_Centauri subject Category:Objects_named_with_variable_star_designations.
- RR_Centauri subject Category:W_Ursae_Majoris_variables.
- RR_Centauri hypernym Star.
- RR_Centauri type CelestialBody.
- RR_Centauri type Place.
- RR_Centauri type Star.
- RR_Centauri type Location.
- RR_Centauri type Place.
- RR_Centauri type Thing.
- RR_Centauri comment "RR Centauri is a variable star of apparent magnitude maximum +7.29. It is located in the constellation of Centaurus, approximately 320 light years distant from the solar system.The system is a contact binary of the W UMa type - two stars in physical contact whose two components share a gaseous envelope. Its spectral type is A9V or F0V.".
- RR_Centauri label "RR Centauri".
- RR_Centauri wasDerivedFrom RR_Centauri?oldid=707927514.
- RR_Centauri depiction RR_Cen_Eclipse_Phase.png.
- RR_Centauri isPrimaryTopicOf RR_Centauri.
- RR_Centauri name "RR Centauri".