Xi Boötis

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Template:Short description

Template:Starbox visbin

Xi Boötis
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Location of ξ Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.675 + 6.816[2]
Characteristics
Spectral type G8 Ve + K4 Ve[3]
B−V Template:Engvar 0.725/1.165[2]
Variable type BY Dra[4]
Astrometry
ξ Boo A
Radial velocity (Rv)Template:Val[1] km/s
Proper motion (μ) RA: 127.468 mas/yr[1]
Dec.: −40.569 mas/yr[1]
Parallax (π)148.0695±0.1317 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Template:Val[5]
ξ Boo B
Radial velocity (Rv)Template:Val[6] km/s
Proper motion (μ) RA: 133.376 mas/yr[6]
Dec.: −182.059 mas/yr[6]
Parallax (π)148.1793±0.0546 mas[6]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Details
ξ Boo A
MassTemplate:Val[7] Template:Solar mass
RadiusTemplate:Val[7] Template:Solar radius
LuminosityTemplate:Val[7] Template:Solar luminosity
Surface gravity (log g)Template:Val[7] cgs
TemperatureTemplate:Val[7] K
Metallicity [Fe/H]Template:Val[7] dex
RotationTemplate:Val[8]
Age200[9] Myr
ξ Boo B
MassTemplate:Val[10] Template:Solar mass
Radius0.61[8] Template:Solar radius
Luminosity (visual, LV)0.061 Template:Solar luminosity
TemperatureTemplate:Val[10] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Rotation11.5[8] days
Other designations
Template:Odlist[11]
Database references
SIMBADThe system
A
B
ARICNSdata

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Xi Boötis is a binary star[10] system in the northern constellation of Boötes. Its name is a Bayer designation that is Latinised from ξ Boötis, and abbreviated Xi Boo or ξ Boo. This is the nearest visible star in the constellation Boötes. The brighter, primary component of the pair has a typical apparent visual magnitude of 4.70, making it visible to the naked eye. Based on parallax measurements, it is located at a distance of Template:Convert from Earth. The pair are drifting further from the Sun with a radial velocity of +2 km/s.[1]

Properties

File:XiBooLightCurve.png
A light curve for Xi Bootis, showing the average of the b and y magnitudes as a function of time. Adapted from Lockwood et al. (2007)[12]

The primary star in this system is a G-type main-sequence star with a stellar classification of G8 Ve,[3] where the 'e' notation indicates emission lines in the spectrum. It is a BY Draconis variable with an apparent magnitude that varies from +4.52 to +4.67 with a period just over 10 days long. The magnetic activity in the star's chromosphere varies with time, but no activity cycle has been found (as of 2019).[13] It has 88% of the mass and 82% of the radius of the Sun, but shines with just 56% the Sun's luminosity.[7]

The secondary component is a smaller K-type main-sequence star with a class of K4 Ve.[3] It has 66% of the Sun's mass and 61% of the Sun's radius. The star is radiating just 6.1% of the luminosity of the Sun from its photosphere at an effective temperature of 4,350 K.[10] This gives it an apparent visual magnitude of 6.8,[2] which by itself would be a challenge to view with the naked eye. As of 2019, it is located at an angular separation of Template:Val from the primary, along a position angle of 298°.[14]

The pair follow a wide, highly elliptical orbit around their common barycenter, completing an orbit every 152.5 years.[15] Radial velocity measurements taken of the primary as part of an extrasolar planet search show a linear trend in the velocities that is likely due to the secondary star.[16] The pair can be resolved using a small telescope. The binary system contains two of the closest young solar-type stars to the Sun, with a system age of about 200 million years old.[9]

The primary star, component A, has been identified as a candidate for possessing a Kuiper-like belt,[17] based on infrared observations. The estimated minimum mass of this dust disk is 2.4 times the mass of the Earth's Moon. (Compare to the value of 8.2 lunar masses for the Kuiper belt.)[18]

A necessary condition for the existence of a planet in this system are stable zones where the object can remain in orbit for long intervals. For hypothetical planets in a circular orbit around the individual members of this star system, this maximum orbital radius is computed to be Template:Val for the primary and 3.5 AU for the secondary. A planet orbiting outside of both stars would need to be at least 108 AU distant.[19]

See also

References

Template:Reflist

External links

Template:Stars of Boötes

  1. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR3a
  2. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Høg_et_al_2000
  3. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Levato_Abt_1978
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Samus_et_al_2017
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named park2013
  6. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR3b
  7. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named Karovicova
  8. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named apj717_2_1279
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named apj687_2_1264
  10. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named aaa338_455
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Lockwood
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Finley_et_al_2019
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Mason_et_al_2014
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Izmailov2025
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Howard2016
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named hinshaw19970203
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aj125_6_3334
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named mnras427_4_2723
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