Beta Trianguli
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 Location of β Trianguli (circled) |
|
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Triangulum |
| Right ascension | 02h 09m 32.62712s[1] |
| Declination | +34° 59′ 14.2694″[1] |
| Apparent magnitude (V) | +3.00[2] |
| Characteristics | |
| Spectral type | A5IV[3] |
| U−B color index | +0.11[2] |
| B−V color index | +0.14[2] |
| Astrometry | |
| Radial velocity (Rv) | +9.9[4] km/s |
| Proper motion (μ) | RA: 149.16[1] mas/yr Dec.: –39.10[1] mas/yr |
| Parallax (π) | 25.71 ± 0.34[1] mas |
| Distance | 127 ± 2 ly (38.9 ± 0.5 pc) |
| Details | |
| Mass | 3.5[5] M☉ |
| Radius | ~4 R☉ |
| Luminosity | 74 (combined)[5] L☉ |
| Surface gravity (log g) | 3.70[3] cgs |
| Temperature | 8186[3] K |
| Rotational velocity (v sin i) | 70[6] km/s |
| Age | 0.73[7] Gyr |
| Other designations | |
Beta Trianguli (Beta Tri, β Trianguli, β Tri) is the Bayer designation for a binary star system in the constellation Triangulum, located about 127 light years from Earth.[1] Although the apparent magnitude is only 3.0,[2] it is the brightest star in the constellation Triangulum.[9]
The star Beta Trianguli has a stellar classification of A5IV, indicating that it has evolved away from the main sequence and is now a giant star, but the classification is uncertain and not consistent with the mass derived from the orbit.[5] It is among the least variable of the stars that were observed by the Hipparcos spacecraft, with a magnitude varying by only 0.0005.[10] This is a probable spectroscopic binary star system with an orbital period of 31.39 days and an eccentricity of 0.43.[11] They are separated by a distance of less than 5 AU.[12]
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.[5]
Naming
- In combination with Alpha Trianguli, these stars were called Al Mīzān, which is Arabic for "The Scale Beam".[9]
- In Chinese, 天大將軍 (Tiān Dà Jiāng Jūn), 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, β Trianguli itself is known as 天大將軍九 (Tiān Dà Jiāng Jūn jiǔ, English: the Ninth Star of Heaven's Great General.).[13]
References
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- ↑ 5.0 5.1 5.2 5.3 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 12.0 12.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 10 日
