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 (Beta Tri, β Trianguli, β Tri) is the Bayer designation for a binary star[1] system in the constellation Triangulum, located about 127 light years from Earth.[2] Although it is only a third-magnitude star,[3] it is the brightest star in the constellation Triangulum.[4]
This is a double-lined spectroscopic binary star system with an orbital period of 31.39 days and an eccentricity of 0.53.[5] 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.[6] 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.[7]
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.[8] It is thought to extend from 50 to 400 AU away from the stars.[9]
Naming
- In combination with Alpha Trianguli, these stars were called Al Mīzān, which is Arabic for "The Scale Beam".[4]
- 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.).[10]
See also
Notes
References
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedmnras389_2_869 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedaaa474_2_653 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedclpl4_99 - ↑ 4.0 4.1 Cite error: Invalid
<ref>tag; no text was provided for refs namedgarfinckle1997 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedPourbaix2004 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedPiccotti2020 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedaaa367_297 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedpap5 - ↑ Template:Cite journal
- ↑ 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