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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 wikiPageRevisionID "601529067".
- Gamma_Arae absmagV "–5.8".
- 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 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 type A-typeMainSequenceStars.
- Gamma_Arae type B-typeSupergiants.
- Gamma_Arae type BayerObjects.
- Gamma_Arae type BinaryStar109221070.
- Gamma_Arae type CelestialBody109239740.
- Gamma_Arae type DoubleStars.
- Gamma_Arae type HenryDraperCatalogueObjects.
- Gamma_Arae type NaturalObject100019128.
- Gamma_Arae type Object100002684.
- Gamma_Arae type PhysicalEntity100001930.
- Gamma_Arae type Star109444100.
- Gamma_Arae type Supergiant109450708.
- Gamma_Arae type Whole100003553.
- Gamma_Arae type CelestialBody.
- Gamma_Arae type Star.
- Gamma_Arae type PhysicalBody.
- Gamma_Arae comment "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.".
- Gamma_Arae label "Gamma Arae".
- Gamma_Arae label "Gamma Arae".
- Gamma_Arae label "Gamma Arae".
- Gamma_Arae label "Gamma Arae".
- Gamma_Arae label "Gamma Arae".
- Gamma_Arae label "Gamma Arae".
- Gamma_Arae label "天壇座γ".
- Gamma_Arae sameAs Gamma_Arae.
- Gamma_Arae sameAs Gamma_Arae.
- Gamma_Arae sameAs Gamma_Arae.
- Gamma_Arae sameAs Gamma_Arae.
- Gamma_Arae sameAs 제단자리_감마.
- Gamma_Arae sameAs Gamma_Arae.
- Gamma_Arae sameAs Gamma_Arae.
- Gamma_Arae sameAs m.088m40.
- Gamma_Arae sameAs Q1329631.
- Gamma_Arae sameAs Q1329631.
- Gamma_Arae sameAs Gamma_Arae.
- Gamma_Arae wasDerivedFrom Gamma_Arae?oldid=601529067.
- Gamma_Arae depiction Ara_IAU.svg.
- Gamma_Arae isPrimaryTopicOf Gamma_Arae.
- Gamma_Arae name "Gamma Arae".