Iota Aquarii

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Template:Short description

Iota Aquarii
Template:Location mark
Location of ι Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 4.279[3]
Characteristics
Spectral type B8 V[4]
U−B Template:Engvar −0.288[3]
B−V Template:Engvar −0.062[3]
Variable type constant[5]
Astrometry
Radial velocity (Rv)−10.0[6] km/s
Proper motion (μ) RA: +42.210 mas/yr[2]
Dec.: −56.566 mas/yr[2]
Parallax (π)15.4940±0.2103 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+0.64[1]
Details[7]
A
MassScript error: No such module "val". Template:Solar mass
Radius2.7[8] Template:Solar radius
Luminosity74[1] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[9] cgs
TemperatureScript error: No such module "val".[8] K
Metallicity [Fe/H]Script error: No such module "val".[9] dex
Rotational velocity (v sin i)135[10] km/s
AgeScript error: No such module "val". Myr
B
MassScript error: No such module "val". Template:Solar mass
TemperatureScript error: No such module "val". K
Metallicity [Fe/H]−0.5 dex
Rotational velocity (v sin i)20 km/s
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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Iota Aquarii is a binary star[7] system in the equatorial constellation of Aquarius. Its identifier is a Bayer designation that is Latinised from ι Aquarii, and abbreviated Iota Aqr or ι Aqr, respectively. This star is visible to the naked eye with an apparent magnitude of +4.279.[3] Based upon parallax measurements, the distance to this star is around Script error: No such module "convert"..[2] The system is drifting closer to the Sun with a radial velocity of −10 km/s.[6]

The binary nature of this system was reported in 2009 following a radial velocity survey using the HARPS instrument.[5] A 2010 infrared search for companions around this star was unsuccessful.[12] The presence of a stellar companion was confirmed through direct spectral detection in 2016. The companion shows a significant velocity variation over a 77-day interval, suggesting a short orbital period.[7]

The spectrum of the primary, component A, fits a stellar classification of B8 V,[4] showing that this is a B-type main-sequence star. It is roughly 124[7] million years old and is spinning rapidly with a projected rotational velocity of 135 km/s.[10] The star has 3.2[7] times the mass of the Sun and 2.7[8] times the Sun's radius. It is radiating 74[1] times the luminosity of the Sun from its photosphere at an effective temperature of ~11,284 K.[8] The secondary, component B, has a spectrum of a solar-mass star.[7] The system is a source for X-ray emission.[13]

References

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  1. ↑ a b c d Script error: No such module "citation/CS1".
  2. ↑ a b c d e Template:Cite Gaia DR3
  3. ↑ a b c d Script error: No such module "citation/CS1".
  4. ↑ a b 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 d e f Script error: No such module "citation/CS1".
    Note: the observations were made on modified Julian dates 6447.91 and 6524.67, which are separated by 76.76 days.
  8. ↑ a b c d Script error: No such module "citation/CS1".
  9. ↑ a b Script error: No such module "citation/CS1".
  10. ↑ a b Script error: No such module "citation/CS1".
  11. ↑ Template:Cite simbad
  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 Aquarius

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