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- Gamma_Arae abstract "Gamma Arae (γ Ara, γ Arae) is a star in the southern constellation of Ara. With an apparent visual magnitude of 3.3, it is the fourth brightest star in the constellation and is readily visible to the naked eye. From parallax measurements made during the Hipparcos mission, the distance to this star can be estimated as 1,110 light-years (340 parsecs) from Earth.This is an enormous star with 23 times the radius of the Sun. It is radiating 120,000 as much energy as the Sun from its outer envelope at an effective temperature of 21,500 K. This heat gives the star the blue-white glow of a B-type star. The spectrum shows it to match a stellar classification of B1 Ib, with the luminosity class of 'Ib' indicating this is a lower luminosity supergiant star. It is a relatively young body, with an estimated age of around 15.7 million years.Gamma Arae is rotating rapidly with a projected rotational velocity of 269 km s−1, causing it to complete a full rotation about every 4.8 days. In the spectrum of this star, this high rate of spin is causing absorption lines to blend together because of the Doppler effect, making them more difficult to analyze. It is a periodically variable star that undergoes non-radial pulsations with a primary period of 1.1811 days and a secondary period of 0.1281 days.There is some disagreement about the mass of this star in the literature. Tetzlaff et al. (2011) estimate the mass as 12.5 ± 0.6 solar masses, while Fraser et al. (2010) give a mass of around 19 and Lefever et al. (2007) lists a value of 25. It is shedding mass through its stellar wind at the rate of 3.0 × 10−8 solar masses per year, which is equivalent to losing the mass of the Sun every 33 million years. The wind is being effected by the star's rapid rotation, resulting in an enhanced outflow along the equator.Gamma Arae has an optical companion located at an angular separation of 17.9 arcseconds, which is an A-type main sequence star with an apparent magnitude of 10.5.".
- Gamma_Arae thumbnail Ara_IAU.svg?width=300.
- Gamma_Arae wikiPageExternalLink AladinPreview?-c=*+gam+Ara&ident=*+gam+Ara&submit=Aladin+previewer.
- Gamma_Arae wikiPageExternalLink VizieR-S?HR%206462.
- Gamma_Arae wikiPageID "2878022".
- Gamma_Arae wikiPageLength "8924".
- Gamma_Arae wikiPageOutDegree "39".
- Gamma_Arae wikiPageRevisionID "649621977".
- Gamma_Arae wikiPageWikiLink A-type_main-sequence_star.
- Gamma_Arae wikiPageWikiLink A-type_main_sequence_star.
- Gamma_Arae wikiPageWikiLink Absorption_line.
- Gamma_Arae wikiPageWikiLink Angular_distance.
- Gamma_Arae wikiPageWikiLink Angular_separation.
- Gamma_Arae wikiPageWikiLink Apparent_magnitude.
- Gamma_Arae wikiPageWikiLink Apparent_visual_magnitude.
- Gamma_Arae wikiPageWikiLink Ara_(constellation).
- Gamma_Arae wikiPageWikiLink Arcsecond.
- Gamma_Arae wikiPageWikiLink Bright_Star_Catalogue.
- Gamma_Arae wikiPageWikiLink Cape_Photographic_Durchmusterung.
- Gamma_Arae wikiPageWikiLink Category:A-type_main-sequence_stars.
- Gamma_Arae wikiPageWikiLink Category:Ara_(constellation).
- Gamma_Arae wikiPageWikiLink Category:B-type_supergiants.
- Gamma_Arae wikiPageWikiLink Category:Bayer_objects.
- Gamma_Arae wikiPageWikiLink Category:Double_stars.
- Gamma_Arae wikiPageWikiLink Category:Henry_Draper_Catalogue_objects.
- Gamma_Arae wikiPageWikiLink Constellation.
- Gamma_Arae wikiPageWikiLink Doppler_effect.
- Gamma_Arae wikiPageWikiLink Durchmusterung.
- Gamma_Arae wikiPageWikiLink Earth.
- Gamma_Arae wikiPageWikiLink Effective_temperature.
- Gamma_Arae wikiPageWikiLink Einstein_Observatory.
- Gamma_Arae wikiPageWikiLink Harvard_Revised_catalogue.
- Gamma_Arae wikiPageWikiLink Henry_Draper_Catalogue.
- Gamma_Arae wikiPageWikiLink Hipparcos.
- Gamma_Arae wikiPageWikiLink Hipparcos_Catalogue.
- Gamma_Arae wikiPageWikiLink List_of_stars_in_Ara.
- Gamma_Arae wikiPageWikiLink Luminosity_class.
- Gamma_Arae wikiPageWikiLink Minute_and_second_of_arc.
- Gamma_Arae wikiPageWikiLink Parallax.
- Gamma_Arae wikiPageWikiLink Projected_rotational_velocity.
- Gamma_Arae wikiPageWikiLink Smithsonian_Astrophysical_Observatory_Star_Catalog.
- Gamma_Arae wikiPageWikiLink Solar_mass.
- Gamma_Arae wikiPageWikiLink Spectral_line.
- Gamma_Arae wikiPageWikiLink Spectrum.
- Gamma_Arae wikiPageWikiLink Star.
- Gamma_Arae wikiPageWikiLink Stellar_classification.
- Gamma_Arae wikiPageWikiLink Stellar_rotation.
- Gamma_Arae wikiPageWikiLink Stellar_wind.
- Gamma_Arae wikiPageWikiLink Supergiant.
- Gamma_Arae wikiPageWikiLink Variable_star.
- Gamma_Arae wikiPageWikiLink File:Ara_IAU.svg.
- Gamma_Arae wikiPageWikiLink File:Cercle_rouge_100%25.svg.
- Gamma_Arae wikiPageWikiLinkText "Gamma Arae".
- Gamma_Arae wikiPageWikiLinkText "γ Ara".
- Gamma_Arae wikiPageWikiLinkText "γ Arae".
- Gamma_Arae absmagV "–5.8".
- Gamma_Arae ageMyr "15.7".
- Gamma_Arae appmagV "3.34".
- Gamma_Arae bV "–0.13".
- Gamma_Arae class "B1 Ib".
- Gamma_Arae constell Ara_(constellation).
- Gamma_Arae epoch "J2000".
- Gamma_Arae gravity "2.9".
- Gamma_Arae hasPhotoCollection Gamma_Arae.
- Gamma_Arae luminosity "120000".
- Gamma_Arae mass "12.5".
- Gamma_Arae pError "0.16".
- Gamma_Arae parallax "2.93".
- Gamma_Arae propMoDec "–15.77".
- Gamma_Arae propMoRa "–0.44".
- Gamma_Arae radialV "–3".
- Gamma_Arae radius "23".
- Gamma_Arae rotation "4.8".
- Gamma_Arae rotationalVelocity "269".
- Gamma_Arae simbad "HD+157246".
- Gamma_Arae temperature "21500".
- Gamma_Arae uB "–0.96".
- Gamma_Arae wikiPageUsesTemplate Template:Convert.
- Gamma_Arae wikiPageUsesTemplate Template:Reflist.
- Gamma_Arae wikiPageUsesTemplate Template:Starbox_astrometry.
- Gamma_Arae wikiPageUsesTemplate Template:Starbox_begin.
- Gamma_Arae wikiPageUsesTemplate Template:Starbox_catalog.
- Gamma_Arae wikiPageUsesTemplate Template:Starbox_character.
- Gamma_Arae wikiPageUsesTemplate Template:Starbox_detail.
- Gamma_Arae wikiPageUsesTemplate Template:Starbox_end.
- Gamma_Arae wikiPageUsesTemplate Template:Starbox_image.
- Gamma_Arae wikiPageUsesTemplate Template:Starbox_observe.
- Gamma_Arae wikiPageUsesTemplate Template:Starbox_reference.
- Gamma_Arae wikiPageUsesTemplate Template:Starbox_sources.
- Gamma_Arae wikiPageUsesTemplate Template:Stars_of_Ara.
- Gamma_Arae subject Category:A-type_main-sequence_stars.
- Gamma_Arae subject Category:Ara_(constellation).
- Gamma_Arae subject Category:B-type_supergiants.
- Gamma_Arae subject Category:Bayer_objects.
- Gamma_Arae subject Category:Double_stars.
- Gamma_Arae subject Category:Henry_Draper_Catalogue_objects.
- Gamma_Arae hypernym Star.
- Gamma_Arae type CelestialBody.
- Gamma_Arae type Place.
- Gamma_Arae type Star.