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- GY_Andromedae abstract "GY Andromedae (GY And) is an α2 Canum Venaticorum type variable star in the northern constellation Andromeda. Its brightness fluctuates in visual magnitude between 6.27m and 6.41m, making it a challenge to view with the naked eye even in good seeing conditions. The magnetic activity on this star shows an unusually long period of variability, cycling about once every 23 years. Based upon parallax measurements, this star is located at a distance of about 520 light-years (160 parsecs) from the Earth.This is classified as an Ap/Bp star, with a peculiar spectrum showing lines of chromium and europium that change in intensity over a period matching the variability cycle, although opposite in phase. Its most striking characteristic is the presence of the unstable element promethium in its emission spectrum. All isotopes of this element are radioactive with half lives of 17.7 years or less. The promethium in the outer envelope may be generated by the spontaneous fission of higher mass transuranic elements.In 1958, American astronomer Horace W. Babcock discovered that this is a spectroscopic binary star. It has an orbital period of 273 days with a large eccentricity of 0.47. The two components are separated by an estimated distance of at least 3.74 × 107 km, or 0.25 Astronomical Units.".
- GY_Andromedae wikiPageExternalLink AladinPreview?-c=01+38+31.8241%2B45+23+58.943&ident=V*+GY+And&submit=Aladin+previewer.
- GY_Andromedae wikiPageExternalLink gy-andromedae.jpg.
- GY_Andromedae wikiPageExternalLink gy-andromedae.shtml.
- GY_Andromedae wikiPageID "305538".
- GY_Andromedae wikiPageLength "7719".
- GY_Andromedae wikiPageOutDegree "41".
- GY_Andromedae wikiPageRevisionID "651189082".
- GY_Andromedae wikiPageWikiLink Alpha2_Canum_Venaticorum_variable.
- GY_Andromedae wikiPageWikiLink Alpha²_Canum_Venaticorum_variable.
- GY_Andromedae wikiPageWikiLink Andromeda_(constellation).
- GY_Andromedae wikiPageWikiLink Ap_and_Bp_stars.
- GY_Andromedae wikiPageWikiLink Apparent_magnitude.
- GY_Andromedae wikiPageWikiLink Astronomical_Unit.
- GY_Andromedae wikiPageWikiLink Astronomical_unit.
- GY_Andromedae wikiPageWikiLink Binary_star.
- GY_Andromedae wikiPageWikiLink Bonner_Durchmusterung.
- GY_Andromedae wikiPageWikiLink Bortle_Dark-Sky_Scale.
- GY_Andromedae wikiPageWikiLink Bortle_scale.
- GY_Andromedae wikiPageWikiLink Bright_Star_Catalogue.
- GY_Andromedae wikiPageWikiLink Category:Alpha2_Canum_Venaticorum_variables.
- GY_Andromedae wikiPageWikiLink Category:Andromeda_(constellation).
- GY_Andromedae wikiPageWikiLink Category:B-type_main-sequence_stars.
- GY_Andromedae wikiPageWikiLink Category:HR_objects.
- GY_Andromedae wikiPageWikiLink Category:Henry_Draper_Catalogue_objects.
- GY_Andromedae wikiPageWikiLink Category:Hipparcos_objects.
- GY_Andromedae wikiPageWikiLink Category:Objects_named_with_variable_star_designations.
- GY_Andromedae wikiPageWikiLink Category:Spectroscopic_binaries.
- GY_Andromedae wikiPageWikiLink Chromium.
- GY_Andromedae wikiPageWikiLink Constellation.
- GY_Andromedae wikiPageWikiLink Durchmusterung.
- GY_Andromedae wikiPageWikiLink Earth.
- GY_Andromedae wikiPageWikiLink Eccentricity_(orbit).
- GY_Andromedae wikiPageWikiLink Emission_spectrum.
- GY_Andromedae wikiPageWikiLink Europium.
- GY_Andromedae wikiPageWikiLink Half-life.
- GY_Andromedae wikiPageWikiLink Harvard_Revised_catalogue.
- GY_Andromedae wikiPageWikiLink Henry_Draper_Catalogue.
- GY_Andromedae wikiPageWikiLink Henry_Draper_catalogue.
- GY_Andromedae wikiPageWikiLink Hipparcos.
- GY_Andromedae wikiPageWikiLink Hipparcos_catalogue.
- GY_Andromedae wikiPageWikiLink Horace_W._Babcock.
- GY_Andromedae wikiPageWikiLink Nuclear_fission.
- GY_Andromedae wikiPageWikiLink Orbital_eccentricity.
- GY_Andromedae wikiPageWikiLink Parallax.
- GY_Andromedae wikiPageWikiLink Peculiar_star.
- GY_Andromedae wikiPageWikiLink Phase_(waves).
- GY_Andromedae wikiPageWikiLink Promethium.
- GY_Andromedae wikiPageWikiLink Radioactive.
- GY_Andromedae wikiPageWikiLink Radioactive_decay.
- GY_Andromedae wikiPageWikiLink Smithsonian_Astrophysical_Observatory_Star_Catalog.
- GY_Andromedae wikiPageWikiLink Spectral_line.
- GY_Andromedae wikiPageWikiLink Spectroscopic_binary.
- GY_Andromedae wikiPageWikiLink Stellar_classification.
- GY_Andromedae wikiPageWikiLink Stellar_magnetic_field.
- GY_Andromedae wikiPageWikiLink Transuranic_element.
- GY_Andromedae wikiPageWikiLink Transuranium_element.
- GY_Andromedae wikiPageWikiLink Variable_star.
- GY_Andromedae wikiPageWikiLink Visual_magnitude.
- GY_Andromedae wikiPageWikiLinkText "GY And".
- GY_Andromedae wikiPageWikiLinkText "GY Andromedae".
- GY_Andromedae absmagV "+0.68".
- GY_Andromedae appmagV "6.36".
- GY_Andromedae bV "+0.04".
- GY_Andromedae class "B9 pe".
- GY_Andromedae constell Andromeda_(constellation).
- GY_Andromedae eccentricity "0.47".
- GY_Andromedae epoch "J2000".
- GY_Andromedae gravity "4.01".
- GY_Andromedae hasPhotoCollection GY_Andromedae.
- GY_Andromedae luminosity "52".
- GY_Andromedae mass "2.47".
- GY_Andromedae metalFe "0.86".
- GY_Andromedae name "GY And B".
- GY_Andromedae pError "0.72".
- GY_Andromedae parallax "6.23".
- GY_Andromedae periarg "17.7".
- GY_Andromedae periodUnitless "2.3586336000000004E7".
- GY_Andromedae propMoDec "-0.77".
- GY_Andromedae propMoRa "-15.64".
- GY_Andromedae radialV "+3.0".
- GY_Andromedae radius "2.6".
- GY_Andromedae rotationalVelocity "31".
- GY_Andromedae temperature "10723".
- GY_Andromedae uB "-0.1".
- GY_Andromedae variable Alpha2_Canum_Venaticorum_variable.
- GY_Andromedae variable Alpha²_Canum_Venaticorum_variable.
- GY_Andromedae wikiPageUsesTemplate Template:Convert.
- GY_Andromedae wikiPageUsesTemplate Template:Reflist.
- GY_Andromedae wikiPageUsesTemplate Template:Starbox_astrometry.
- GY_Andromedae wikiPageUsesTemplate Template:Starbox_begin.
- GY_Andromedae wikiPageUsesTemplate Template:Starbox_catalog.
- GY_Andromedae wikiPageUsesTemplate Template:Starbox_character.
- GY_Andromedae wikiPageUsesTemplate Template:Starbox_detail.
- GY_Andromedae wikiPageUsesTemplate Template:Starbox_end.
- GY_Andromedae wikiPageUsesTemplate Template:Starbox_observe.
- GY_Andromedae wikiPageUsesTemplate Template:Starbox_reference.
- GY_Andromedae wikiPageUsesTemplate Template:Starbox_visbin.
- GY_Andromedae wikiPageUsesTemplate Template:Stars_of_Andromeda.
- GY_Andromedae subject Category:Alpha2_Canum_Venaticorum_variables.