Epsilon Arietis

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Template:Short description

ε Arietis
Template:Location mark
Location of ε Arietis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.63[2] (5.2/5.5)[3]
Characteristics
Spectral type A2 Vs + A2 Vs[4]
U−B Template:Engvar +0.08[2]
B−V Template:Engvar +0.04[2]
R−I Template:Engvar 0.02Script error: No such module "Unsubst".
Astrometry
Radial velocity (Rv)+0.9±0.9[5] km/s
Proper motion (μ) RA: −15.884 mas/yr[1]
Dec.: −7.151 mas/yr[1]
Parallax (π)9.0296±0.1851 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Orbit[6]
Period (P)Template:Val yr
Semi-major axis (a)Template:Val″
Eccentricity (e)Template:Val
Inclination (i)Template:Val°
Longitude of the node (Ω)Template:Val°
Periastron epoch (T)Template:Val
Argument of periastron (ω)
(secondary)		Template:Val°
Details
ε Ari A
Mass2.4[6] Template:Solar mass
Rotational velocity (v sin i)60[4] km/s
ε Ari B
Mass2.4[6] Template:Solar mass
Metallicity [Fe/H]{{{metal_fe2}}} dex
Rotational velocity (v sin i)60[4] km/s
Other designations
Template:Odlist[7]
ε Ari A: Template:Odlist
ε Ari B: HD 18519, HR 887
Database references
SIMBADε Ari
ε Ari A
ε Ari B

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Epsilon Arietis is a visual binary[8] star system in the northern constellation of Aries. Its name is a Bayer designation that is Latinized from ε Arietis, and abbreviated Epsilon Ari or ε Ari. This system has a combined apparent visual magnitude of 4.63[2] and can be seen with the naked eye, although the two components are too close together to be resolved without a telescope. With an annual parallax shift of Template:Val,[9] the distance to this system can be estimated as Template:Convert, give or take a 7 light-year margin of error. It is located behind the dark cloud MBM12.[6]

The brighter member of this pair has an apparent magnitude of 5.2.[3] At an angular separation of Template:Val from the brighter component, along a position angle of Template:Val,[8] is the magnitude 5.5 companion.[3] Both are A-type main sequence stars with a stellar classification of A2 Vs.[4] (The 's' suffix indicates that the absorption lines in the spectrum are distinctly narrow.) In the 2009 Catalogue of Ap, HgMn and Am stars, the two stars have a classification of A3 Ti,[3] indicating they are Ap stars with an anomalous abundance of titanium. Within the measurement margin of error, their projected rotational velocities are deemed identical at 60 km/s.[4]

Name

This star system, along with δ Ari, ζ Ari, π Ari, and ρ3 Ari, were Al Bīrūnī's Al Buṭain (ألبطين), the dual of Al Baṭn, the Belly.[10] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Buṭain were the title for five stars :δ Ari as Botein, π Ari as Al Buṭain I, ρ3 Ari as Al Buṭain II, ε Ari as Al Buṭain III and ζ Ari as Al Buṭain IV[11]

In Chinese astronomy, Epsilon Arietis may be or may be part of Tso Kang (from Cantonese Script error: No such module "Lang". zogang, Mandarin pronunciation zuǒgēng).[12][13]

References

Template:Reflist

External links

Template:Stars of Aries

  1. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Gaia_DR3
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named aj68_697
  3. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named aaa498_3_961
  4. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named aaa393_897
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named al32_11_759
  6. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Rica2012
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named mnras374_3_965
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa474_2_653
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Allen_1963
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Rhoads_1971
  12. ↑ 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.
  13. ↑ Script error: No such module "Lang". (Yi Shi Tong) (1981): Script error: No such module "Lang"..Template:In lang
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