Iota Arae

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Template:Short description

ι Arae
Template:Location mark
Location of ι Arae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ara[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) Script error: No such module "val".[3]
Characteristics
Spectral type B2 IVe + sdO[4]
U−B Template:Engvar −0.82[5]
B−V Template:Engvar −0.11[5]
R−I Template:Engvar −0.08
Variable type BE[3]
Astrometry
Radial velocity (Rv)−19.0±7.4[6] km/s
Proper motion (μ) RA: −6.209 mas/yr[2]
Dec.: −17.699 mas/yr[2]
Parallax (π)3.5613±0.0904 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−2.06[1]
Orbit[4]
Period (P)176.17±0.04
Inclination (i)46±6°
Periastron epoch (T)Script error: No such module "val".
Semi-amplitude (K1)
(primary)		5.80±0.06 km/s
Semi-amplitude (K2)
(secondary)		57.6±0.6 km/s
Details
ι Ara A
MassScript error: No such module "val".[7] Template:Solar mass
Radius6.3[2] Template:Solar radius
Luminosity10,864[8] Template:Solar luminosity
Surface gravity (log g)4.18[8] cgs
Temperature20,172[2] K
Rotational velocity (v sin i)340[8] km/s
AgeScript error: No such module "val".[7] Myr
ι Ara B
MassScript error: No such module "val".[4] Template:Solar mass
RadiusScript error: No such module "val".[9] Template:Solar radius
Luminosity437[9] Template:Solar luminosity
Temperature33,800[9] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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Iota Arae is a binary star system in the southern constellation of Ara. Its name is a Bayer designation that is Latinized from ι Arae, and abbreviated Iota Ara or ι Ara. The system has a combined apparent visual magnitude of 5.2. Based upon the Bortle Dark-Sky Scale, this means it is visible to the naked eye from suburban skies. Parallax measurements yield a distance estimate of Script error: No such module "convert"., give or take a 20 light-year margin of error. It is drifting closer to the Sun with a radial velocity of around −19 km/s.[6]

The primary component is an evolved subgiant star with a stellar classification of B2 IVe.[4] The 'e' notation indicates the spectrum displays emission lines, which means this is a Be star that is surrounded by hot, circumstellar gas. It is spinning rapidly with a projected rotational velocity of Script error: No such module "val"..[8] The Doppler effect from this rotation is causing the absorption lines to widen and become nebulous.

File:IotaAraLightCurve.png
A light curve for Iota Arae, plotted from TESS data[11]

Iota Arae has around 8.3[7] times the mass of the Sun and is shining brightly with 10,864 times the Sun's luminosity.[8] This energy is being radiated into space from the outer atmosphere at an effective temperature of Script error: No such module "val".,[2] giving it the characteristic blue-white hue of a B-type star.[12] The General Catalog of Variable Stars classifies it as a BE variable star, ranging from visual magnitude 5.18 to 5.26 with a period of 13.36 hours.[3] In a study of the Hipparcos data, it was found to vary in brightness by 0.054 in magnitude with no clear period.[13]

This is a spectroscopic binary system with an orbital period of 176 days. The companion is a subdwarf O star with a mass similar to the Sun but only 61% of the Sun's radius.[4]

References

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  1. ↑ a b Script error: No such module "Citation/CS1".
  2. ↑ a b c d e f g Template:Cite Gaia DR3
  3. ↑ a b c Script error: No such module "Citation/CS1".
  4. ↑ a b c d e Script error: No such module "Citation/CS1".
  5. ↑ a b Script error: No such module "Citation/CS1".
  6. ↑ a b Script error: No such module "Citation/CS1".
  7. ↑ a b c Script error: No such module "Citation/CS1".
  8. ↑ a b c d e Script error: No such module "Citation/CS1".
  9. ↑ a b c Script error: No such module "Citation/CS1".
  10. ↑ Template:Cite simbad
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".

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External links

Template:Stars of Ara

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