Epsilon2 Arae

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Epsilon2 Arae
Template:Location mark
The location of ε2 Arae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.270[2] (5.44 + 8.65)[3]
Characteristics
Spectral type F5 V Fe+0.5[4] + DA3.2[5]
U−B Template:Engvar +0.015[6]
B−V Template:Engvar +0.498±0.005[2]
Astrometry
Radial velocity (Rv)+4.9[7] km/s
Proper motion (μ) RA: −22.409 mas/yr[1]
Dec.: −143.793 mas/yr[1]
Parallax (π)37.3696±0.1347 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)3.27[8]
Orbit[9]
Primaryε2 Ara Aa
Companionε2 Ara Ab
Period (P)41.3 yr
Semi-major axis (a)0.589″
Eccentricity (e)0.622
Inclination (i)133.8°
Longitude of the node (Ω)73.6°
Details
ε2 Ara Aa
Mass1.40Template:Su[10] Template:Solar mass
Radius1.8[2] Template:Solar radius
Luminosity4.56[2] Template:Solar luminosity
Surface gravity (log g)4.29[8] cgs
Temperature6,577[8] K
Metallicity [Fe/H]+0.02[8] dex
Rotational velocity (v sin i)45.4[11] km/s
Age1.77Template:Su[10] Gyr
ε2 Ara C
MassTemplate:Val[12] Template:Solar mass
RadiusTemplate:Val[12] Template:Solar radius
Surface gravity (log g)Template:Val[12] cgs
TemperatureTemplate:Val[12] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[6]
Database references
SIMBADdata

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Epsilon2 Arae is a double star in the southern constellation of Ara. Its name is a Bayer designation that is Latinized from ε2 Arae, and abbreviated Epsilon2 Ara or ε2 Ara. Based on parallax measurements, it is Template:Convert distant from Earth. With a combined apparent visual magnitude of 5.27,[2] this system is faintly visible to the naked eye as a point of light.

The brighter star is a magnitude 5.44 F-type main sequence star with a stellar classification of F5 V Fe+0.5.[4] The Fe+0.5 notation indicates that it has a somewhat higher than normal abundance of iron. It has an estimated age of 1.8[10] billion years and a relatively high rate of rotation with a projected rotational velocity of 45 km/s.[11] This star has 1.4[10] times the mass of the Sun and 1.8 times the Sun's radius.[2] It is radiating 4.56[2] times the luminosity of the Sun from its photosphere at an effective temperature of 6,577 K.[8] The metallicity of the star, a measure of the abundance of more massive elements, is similar to the Sun.[8] It is a candidate pulsating star.[13]

There is a magnitude 8.65 stellar companion, component Ab, at an angular separation of 0.590 arcseconds.[3] The pair have an estimated orbital period of 41.3 years.[9] A common proper motion white dwarf companion, WD 1659-53, lies at an angular separation of Template:Val. Designated component C, it is magnitude 13.47 with a classification of DA3.2.[14][5]

References

Template:Reflist

External links

Template:Stars of Ara

  1. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Gaia_DR3
  2. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named Schofield_et_al_2019
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named mnras389_2_869
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aj132_1_161
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Holberg_et_al_2013
  6. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaass501_3_941
  8. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named apj354
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Tokovinin2017
  10. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Aguilera-Gómez_et_al_2018
  11. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaa493_3_1099
  12. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Bédard_et_al_2017
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Baade_Kjeldsen_1997
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD2
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