Beta Trianguli
Template:Location mark Location of β Trianguli (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Triangulum |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +3.00[2] (3.44 + 4.19)[3] |
| Characteristics | |
| Spectral type | A8III / A3III[3] |
| U−B Template:Engvar | +0.11[2] |
| B−V Template:Engvar | +0.21 / 0.07[3] |
| 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) | 23.169±0.434 mas[5] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | Script error: No such module "val". (0.305 + 0.1055)[3] |
| Orbit[6] | |
| Period (P) | 31.3884 d |
| Semi-major axis (a) | Script error: No such module "val".[3] |
| Eccentricity (e) | 0.53 |
| Periastron epoch (T) | 2432004.255 JD |
| Argument of periastron (ω) (secondary) | 318.4° |
| Semi-amplitude (K1) (primary) | 33.3 km/s |
| Semi-amplitude (K2) (secondary) | 69.2 km/s |
| Details[3] | |
| A | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Template:Solar radius calculatorTemplate:Efn Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | 3.70[7] cgs |
| Temperature | 7,683 K |
| Rotational velocity (v sin i) | 70[8] km/s |
| Age | Script error: No such module "val". Gyr |
| B | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Template:Solar radius calculatorTemplate:Efn Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Temperature | 8,759 K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Age | Script error: No such module "val". Gyr |
| Other designations | |
| β Trianguli, β Tri, Beta Tri, 4 Trianguli, HR 622, HD 13161, BD+34°381, FK5 75, HIP 10064, SAO 55306.[9] | |
| Database references | |
| SIMBAD | data |
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Beta Trianguli (Beta Tri, β Trianguli, β Tri) is the Bayer designation for a binary star[10] system in the constellation Triangulum, located about 127 light years from Earth.[1] Although it is only a third-magnitude star,[2] it is the brightest star in the constellation Triangulum.[11]
This is a double-lined spectroscopic binary star system with an orbital period of 31.39 days and an eccentricity of 0.53.[6] The members are separated by a distance of Script error: No such module "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.[3] 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.[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.[13] It is thought to extend from 50 to 400 AU away from the stars.[14]
Naming
- In combination with Alpha Trianguli, these stars were called Al Mīzān, which is Arabic for "The Scale Beam".[11]
- In Chinese, Script error: No such module "Lang". (Script error: No such module "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 Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.).[15]
See also
Notes
References
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- ↑ a b c d e Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b c d e f g Script error: No such module "citation/CS1". Beta Trianguli's database entry at VizieR.
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1". Beta Trianguli's database entry.
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ 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
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