44 Boötis

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Template:Short description Template:About-distinguish

44 Boötis
File:44BooLightCurve.png
A light curve for 44 Boötis plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 4.70 - 4.84[3] (5.136 / 6.004)[4]
Characteristics
Spectral type G0Vnv[5] + (K0V + K4V)[6]
U−B Template:Engvar 0.09[7]
B−V Template:Engvar 0.65[7]
Variable type W UMa[3]
Astrometry
Radial velocity (Rv)−17.89[8] km/s
Proper motion (μ) RA: −445.84[2] mas/yr
Dec.: 19.86[2] mas/yr
Parallax (π)78.39±1.03 mas[9]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+2.211[9] / +5.38[10]
Orbit[11]
Primary44 Boo A
Companion44 Boo B
Period (P)Template:Val yr
Semi-major axis (a)Template:Val″
Eccentricity (e)Template:Val
Inclination (i)Template:Val°
Longitude of the node (Ω)Template:Val°
Periastron epoch (T)B Template:Val
Argument of periastron (ω)
(secondary)		Template:Val°
Orbit[10]
Primary44 Boo Ba
Companion44 Boo Bb
Period (P)0.267818 days
Semi-major axis (a)Template:Val
Eccentricity (e)0.0
Inclination (i)72.8°
Semi-amplitude (K1)
(primary)		231.31 km/s
Semi-amplitude (K2)
(secondary)		112.70 km/s
Details
44 Boo A
MassTemplate:Val[11] Template:Solar mass
Luminosity1.552[4] Template:Solar luminosity
Surface gravity (log g)4.33[12] cgs
Temperature5,877[12] K
Metallicity [Fe/H]−0.24[12] dex
Age1.4–1.5[13] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
44 Boo Ba
Mass0.98[14] Template:Solar mass
Radius0.87[14] Template:Solar radius
Luminosity0.51[14] Template:Solar luminosity
Temperature5,300[14] K
44 Boo Bb
Mass0.55[14] Template:Solar mass
Radius0.66[14] Template:Solar radius
Luminosity0.24[14] Template:Solar luminosity
Temperature5,035[14] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[15]
Database references
SIMBADdata
A
B

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44 Boötis, also known as i Boötis, is a triple star system in the constellation Boötes. It is approximately 41.6 light years from Earth.

44 Boötis can be resolved into two stars, of 5th and 6th magnitudes respectively. They were separated by Template:Val when the pair were confirmed in 1819, but were only Template:Val by 2020 as the two orbit every 210 years.[16][11]

The primary component, 44 Boötis A, also named Quadrans,[17] is a yellow-white G-type main sequence star with a mean apparent magnitude of +4.83. The companion component, 44 Boötis B, is a W Ursae Majoris variable spectroscopic binary. The variability of this star system was discovered by English astronomer William Herschel.[18] The brightness of the eclipsing binary varies from magnitude +5.8 to +6.40 with a period of 6.43 hours.[19] The two eclipsing components of the system are close enough to allow their stellar envelopes to overlap, or at least nearly so.[10] In 1948, flare behavior was measured from this system based on data from O. J. Eggen.[20]

44 Boötis appears to have an infrared excess, implying the existence of a dust disk that absorbs visible light and re-emits it as infrared light. The dust would have a blackbody temperature of about 23 K, situated up to 182 au from the parent star.[4]

This star was a member of the obsolete constellation Quadrans Muralis. The IAU Working Group on Star Names approved the name Quadrans for component A on 17 February 2025, after the obsolete constellation, and it is now so entered in the IAU Catalog of Star Names.[17]

References

Template:Reflist

External links

Template:Stars of Boötes

  1. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named MAST
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named aa474_2_653
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named gcvs
  4. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Montesinos
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aj121_4_2148
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named zasche
  7. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named MERMILLIOD
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named mnras357_2_497
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named eker 2008
  10. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named lu
  11. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Zirm
  12. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named apj756_1_46
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named apj687
  14. ↑ a b c d e f g h Cite error: Invalid <ref> tag; no text was provided for refs named latkovic2021
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named wds
  17. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named IAU-CSN-new
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Percy2007
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named malkov2006
  20. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Huruhata_1952
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