Beta Arae
Template:Location mark Location of β Arae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 2.84[2] |
| Characteristics | |
| Evolutionary stage | Red supergiant |
| Spectral type | K0/1Ib[3] |
| U−B Template:Engvar | +1.56[4] |
| B−V Template:Engvar | +1.46[4] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[6] Dec.: Script error: No such module "val". mas/yr[6] |
| Parallax (π) | 4.5601±0.2077 mas[1] |
| Distance | Script error: No such module "val". ly (Script error: No such module "val". pc)[7] |
| Absolute magnitude (MV) | −3.494[8] |
| Details[9] | |
| Mass | Script error: No such module "val". or 7.89±0.4 Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | Script error: No such module "val". dex |
| Rotational velocity (v sin i) | Script error: No such module "val".[5] km/s |
| Age | Script error: No such module "val".[10] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[11] | |
| Database references | |
| SIMBAD | data |
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Beta Arae is the brightest star in the constellation of Ara. This is a very luminous, relatively young red supergiant with an apparent visual magnitude of 2.84 and an absolute magnitude of −3.494.[2][8] Its name is a Bayer designation that is Latinized from β Arae, and abbreviated Beta Ara or β Ara. Based on a photogeometric estimation method, it is 710 light-years away,[7] a distance of which interstellar extinction in the line of sight reduces its apparent magnitude by 0.193 magnitudes.[9]
Characteristics
The spectrum of this star matches a stellar classification of K0/1 Ib,[3] with the luminosity class notation 'Ib' indicating that the star is a supergiant. It has an age estimated at 50 million years,[10] having spent much of its life as a B-type star.[12] Currently, it has expanded to 141 times the Sun's size and is 5,800 times more luminous.[9] Beta Arae is radiating energy from its outer envelope at an effective temperature of Script error: No such module "val"., which causes it to take on the orange hue of a K-type star.[13] This enlarged star appears to be rotating slowly with a projected rotational velocity of about Script error: No such module "val"..[5] The abundance of elements other than hydrogen and helium, its metallicity, is more than three times that of the Sun.[5]Template:Efn
Nomenclature
Beta Arae is the star's Bayer designation. Other designations include HD 157244 (from the Henry Draper Catalogue), HIP 85258 (from the Hipparcos catalogue) and HR 6461 (from the Bright Star Catalogue).[11]
Rarely, this star is called Vasat-ül-cemre a Turkisation of Arabic وسط الجمر (wasaṭ al-jamar), meaning "middle of the embers."[14] The constellation is named in Arabic المجمرة (al-mijmarah), meaning brazier/incense-burner.[15] In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Pestle, refers to an asterism of β, σ and α Arae.[16] The Chinese name for β Arae is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[17]
Notes
References
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- ↑ a b c Template:Cite Gaia EDR3
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- ↑ a b Script error: No such module "Citation/CS1". Beta Arae's database entry at VizieR.
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b c d Script error: No such module "Citation/CS1".
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- ↑ a b Script error: No such module "Citation/CS1". Data about this star can be seen here.
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b c Script error: No such module "Citation/CS1". Beta Arae's database entry at VizieR.
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b Template:Cite simbad
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