Zeta Boötis

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Template:Short description

Template:Starbox visbin

ζ Boötis
Template:Location mark
Location of ζ Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
ζ Boo
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.78[2] (4.46 + 4.55)[3]
HIP 71759
Right ascension Template:RA[4]
Declination Template:DEC[4]
Apparent magnitude (V) 5.925[5]
Characteristics
ζ Boo
Spectral type A1V[6]
U−B Template:Engvar +0.05[2]
B−V Template:Engvar +0.05[2]
HIP 71759
Spectral type F0V[7]
B−V Template:Engvar 0.227[5]
Variable type δ Scuti[8]
Astrometry
ζ Boo
Radial velocity (Rv)Script error: No such module "val".[9] km/s
Proper motion (μ) RA: +51.95 mas/yr[1]
Dec.: −11.08 mas/yr[1]
Parallax (π)18.56±0.76 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+0.13[10]
HIP 71759
Proper motion (μ) RA: +54.399 mas/yr[4]
Dec.: −15.481 mas/yr[4]
Parallax (π)19.3257±0.0511 mas[4]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)2.37[8]
Details[11]
ζ Boo A
MassScript error: No such module "val". Template:Solar mass
RadiusScript error: No such module "val". Template:Solar radius
TemperatureScript error: No such module "val". K
AgeScript error: No such module "val". Myr
ζ Boo B
MassScript error: No such module "val". Template:Solar mass
RadiusScript error: No such module "val". Template:Solar radius
TemperatureScript error: No such module "val". K
Metallicity [Fe/H]{{{metal_fe2}}} dex
AgeScript error: No such module "val". Myr
HIP 71759
MassScript error: No such module "val".[8] Template:Solar mass
RadiusScript error: No such module "val".[8] Template:Solar radius
LuminosityScript error: No such module "val".[8] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[8] cgs
TemperatureScript error: No such module "val".[8] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[12]
A: Template:Odlist[13]
B: Template:Odlist[14]
HIP 71759: Template:Odlist
Database references
SIMBADdata
HIP 71759
SIMBADdata

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Zeta Boötis is a binary star system in the constellation of Boötes that forms a triple star system with HIP 71759. Its name is a Bayer designation that is Latinized from ζ Boötis, and abbreviated Zeta Boo or ζ Boo. They have the Flamsteed designation 30 Boötis. This system is visible to the naked eye as a point of light with an apparent visual magnitude of +3.78.[2] The individual magnitudes of the components differ slightly, with component A having a magnitude of 4.46 and component B at the slightly dimmer magnitude 4.55.[3] The system is located at a distance of approximately 180 light years based on parallax,[1] but is drifting closer to the Sun with a radial velocity of −9 km/s.[9]

Observations

The duplicity of this star was discovered by English astronomer William Herschel in 1796, and their changing positions have been tracked from 1823 onward.[15]

In 1976, T. W. Edwards found a stellar classification of A2III for both inner components, suggesting they may be evolved A-type giant stars. Helmut A. Abt reported a class of A2V in 1981, which matches an A-type main-sequence star.[16] Abt and Nidia Morrell updated the classification to A1V in 1995.[6]

Characteristics

The two components of the pair, Zeta Boötis A and B, are A-type main-sequence stars. Component A has 2.21 times the Sun's mass, 2.6 times the Sun's radius and an effective temperature of 8,800 K. Component B has 2.15 times the Sun's mass, 2.4 times the Sun's radius and an effective temperature of 8,750 K. Their estimated age is 560 million years.[11]

The stars take 125 years to orbit each other. The orbit of this pair has a very high eccentricity of 0.98045, bringing them within 0.818 au at their closest approach (periastron). Template:Asof, the eccentricity of this system is possibly the second-highest known, after HIP 26245, whose eccentricity is Script error: No such module "val".. The last periastron occurred during November 2023.[11] Considering the extreme nature of their orbit, it is unlikely that any exoplanets could have stable orbits around either star.[17]

Together with the star HIP 71759, Zeta Boötis make a triple star system. This distant star has an estimated orbital period of three million years, being at an observed distance of Template:Cvt from the inner pair. The orbit of this star is likely what forced the high eccentricity orbit of the inner pair, via the Kozai mechanism.[18] It has a class of F0V, matching an F-type main-sequence star.[7] It is a Delta Scuti variable with a brightness amplitude of 0.00134 magnitudes.[8]

Gallery

References

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

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External links

Template:Stars of Boötes

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