Beta Trianguli
Template:Short description Template:Starbox begin Template:Starbox image Template:Starbox observe Template:Starbox character Template:Starbox astrometry Template:Starbox orbit Template:Starbox detail Template:Starbox catalog Template:Starbox reference Template:Starbox end
Beta Trianguli, formally named Alaybasan (for component A),[1] is a binary star[2] system in the constellation Triangulum, located about 127 light years from Earth.[3] Although it is only a third-magnitude star,[4] it is the brightest star in the constellation Triangulum.[5]
Naming
Beta Trianguli (Latinized from β Trianguli, abbreviated Beta Tri, β Tri) is the star's Bayer designation.
This star together with α Trianguli were called by the Arabic names Al Mīzān, "the Scale Beam",[5] and Al-Aybasān, "the Two Joints [of Aries]"; the latter also written as Al-Anīsān, meaning "the Two Friends".[1] Mizan has been used as a name for β Trianguli.[6] The name Alaybasan was approved for Beta Trianguli A by the IAU Working Group on Star Names on 7 November 2025 and it is now so entered in the IAU Catalog of Star Names.[7]
In Chinese, Template:Lang (Template:Lang), meaning Heaven's Great General, refers to an asterism consisting of β Trianguli, γ Andromedae, φ Persei, 51 Andromedae, 49 Andromedae, χ Andromedae, υ Andromedae, τ Andromedae, 56 Andromedae, γ Trianguli and δ Trianguli. Consequently, the Chinese name for β Trianguli itself is Template:Lang (Template:Lang, Template:Langx).[8]
Star system
This is a double-lined spectroscopic binary star system with an orbital period of 31.39 days and an eccentricity of 0.53.[9] The members are separated by a distance of Template:Val. The primary and secondary components have stellar classifications of A8III and A3III respectively, indicating that they evolved away from the main sequence and are now giant stars. Component A is 2.6 times more massive than the Sun, but expanded to Template:Solar radius calculator the Sun's radiusTemplate:Efn and irradiates 60 times more than the Sun. Component B is somewhat smaller and less luminous, being 2.25 times more massive, Template:Solar radius calculator times largerTemplate:Efn and 30 times brighter than the Sun. The system has an age around 400 million years, less than 10% that of the Solar System.[10] Beta Trianguli is among the least variable of the stars that were observed by the Hipparcos spacecraft, with a magnitude varying by only 0.0005.[11]
Based on observations using the Spitzer Space Telescope, as reported in 2005, this system is emitting an excess of infrared radiation. This emission can be explained by a circumbinary ring of dust. The dust is emitting infrared radiation at a blackbody temperature of 100 K.[12] It is thought to extend from 50 to 400 AU away from the stars.[13]
See also
Notes
References
- ↑ 1.0 1.1 Cite error: Invalid
<ref>tag; no text was provided for refs named "ASE". - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs named "mnras389_2_869". - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs named "aaa474_2_653". - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs named "clpl4_99". - ↑ 5.0 5.1 Cite error: Invalid
<ref>tag; no text was provided for refs named "garfinckle1997". - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs named "rhoads1971". - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs named "IAU-CSN". - ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 10 日 Template:Webarchive
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs named "Pourbaix2004". - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs named "Piccotti2020". - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs named "aaa367_297". - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs named "pap5". - ↑ Template:Cite journal