Zeta Arae
Template:Location mark Location of ζ Arae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 3.13[2] |
| Characteristics | |
| Spectral type | K3 III[3] |
| U−B Template:Engvar | +1.96[2] |
| B−V Template:Engvar | +1.60[2] |
| Astrometry | |
| Radial velocity (Rv) | −6.0±0.6[4] km/s |
| Proper motion (μ) | RA: −17.518 mas/yr[1] Dec.: −36.120 mas/yr[1] |
| Parallax (π) | 5.7725±0.1727 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −3.95[5] |
| Details | |
| Mass | 7-8[6] Template:Solar mass |
| Radius | 114±4[6] Template:Solar radius |
| Luminosity | 3,800Script error: No such module "Su".[6] Template:Solar luminosity |
| Surface gravity (log g) | 1.200±0.004[6] cgs |
| Temperature | 4,246Script error: No such module "Su".[6] K |
| Metallicity [Fe/H] | −0.40[7] dex |
| Age | 40~50Script error: No such module "Unsubst". Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
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Zeta Arae is the third-brightest star in the southern constellation Ara.[9] Its name is a Bayer designation that is Latinized from ζ Arae, and abbreviated Zeta Ara or ζ Ara. The apparent visual magnitude of this star is 3.1,[2] which can be seen with the naked eye from suburban skies in the southern hemisphere. From the parallax measurements, it is located at a distance of approximately Script error: No such module "convert". from Earth.[1] The star is drifting closer to the Sun with a radial velocity of 6 km/s.[4]
The spectrum of this star matches a stellar classification of K3 III.[3] The luminosity class of 'III' indicates this is a giant star that has exhausted the hydrogen at its core and evolved away from the main sequence. However, some studies have suggested it is instead a supergiant.[5][10] The star has 7-8 times the mass of the Sun and has expanded to 114 times the Sun's girth. It is radiating 3,800[6] times the luminosity of the Sun from its photosphere at an effective temperature of 4,246 K,[6] giving it the orange hue of a K-type star.[11]
In 1997, an excess of infrared emission was announced that may indicate circumstellar matter.[12] However, a 2015 study found no excess.[13] A candidate gravitationally bound companion was announced in 2022. This object lies at an angular separation of Script error: No such module "val". from Zeta Arae, which is equivalent to a projected separation of Script error: No such module "val"..[14]
Nomenclature
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Tortoise, refers to an asterism consisting of ζ Arae, ε1 Arae, γ Arae, δ Arae and η Arae.[15] Consequently, the Chinese name for ζ Arae itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[16]
R. H. Allen called it Tseen Yin Template:IPAc-en, together with δ Arae, from the Chinese 天陰 (Mandarin pronunciation tiānyīn) "dark sky".[17] However, 天陰 is in Aries.[18][19] so Allen probably confused constellation "Ara" with "Ari".
References
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- ↑ a b c d e Template:Cite Gaia EDR3
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
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- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c d e f g Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ 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".
- ↑ Script error: No such module "citation/CS1".
- ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
- ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 1 日 Template:Webarchive
- ↑ Script error: No such module "citation/CS1".
- ↑ Chevalier, S., and Tsuchihashi, P., (1911): "Catalogue d'Étoiles fixes, observés a Pekin sous l'Empereur Kien Long (Qianlong (Chien-Lung)), XVIIIe siecle", Annales de l'Observatoire Astronomique de Zô-Sé.
- ↑ Script error: No such module "Lang". (Yi Shi Tong) (1981): Script error: No such module "Lang"..Template:In lang
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