Mu Boötis

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Mu Boötis
Bootes IAU.svg
Cercle rouge 100%25.svg

Location of μ Boötis (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Boötes
A
Right ascension 15h 24m 29.43147s [1]
Declination +37° 22 37.7613 [1]
Apparent magnitude  (V)4.31 [2]
B or Ba
Right ascension 15h 24m 30.86726s [3]
Declination +37° 20 50.2761 [3]
Apparent magnitude  (V)6.98 [4]
C or Bb
Right ascension 15h 24m 30.89704s [5]
Declination +37° 20 52.555 [5]
Apparent magnitude  (V)7.63 [4]
Characteristics
Mu1 Boötis
Spectral type F2IV [6]
U−B color index +0.06 [7]
B−V color index +0.31 [7]
R−I color index 0.15
Mu2 Boötis
Spectral type F9V + G0V [6]
U−B color index +0.13 [7]
B−V color index +0.59 [7]
Astrometry
A
Radial velocity (Rv)−8.60±0.3 [8]  km/s
Proper motion (μ)RA: −149.928 [1]   mas/yr
Dec.: +89.573 [1]   mas/yr
Parallax (π)26.5759 ± 0.7871  mas [1]
Distance 123 ± 4  ly
(38 ± 1  pc)
Absolute magnitude  (MV)1.47 [9]
B or Ba
Proper motion (μ)RA: −139.142 [3]   mas/yr
Dec.: +90.281 [3]   mas/yr
Parallax (π)27.2223 ± 0.0168  mas [3]
Distance 119.81 ± 0.07  ly
(36.73 ± 0.02  pc)
C or Bb
Proper motion (μ)RA: −152.149 [5]   mas/yr
Dec.: +89.593 [5]   mas/yr
Parallax (π)27.2126 ± 0.0181  mas [5]
Distance 119.85 ± 0.08  ly
(36.75 ± 0.02  pc)
Orbit [6]
PrimaryAa
CompanionAb
Period (P)3.75 yr
Semi-major axis (a)0.099″
Eccentricity (e)0.270
Inclination (i)129.7°
Longitude of the node (Ω)129.4°
Periastron epoch (T)1006.33
Argument of periastron (ω)
(secondary)
43.5°
Orbit [6]
PrimaryB
CompanionC
Period (P)265 yr
Semi-major axis (a)1.46″
Eccentricity (e)0.585
Inclination (i)135.5°
Longitude of the node (Ω)174°
Periastron epoch (T)1864.9
Argument of periastron (ω)
(secondary)
338°
Details
Aa
Mass 1.6 [6]   M
Radius 1.9 [2]   R
Luminosity 20 [10]   L
Surface gravity (log g)3.4 [6]   cgs
Temperature 7,000 [6]   K
Rotational velocity (v sin i)89 [6]  km/s
Ab
Mass 1.5 [6]   M
Surface gravity (log g)3.6 [6]   cgs
Temperature 7,000 [6]   K
Rotational velocity (v sin i)40 [6]  km/s
B or Ba
Mass 1.24 [6]   M
Radius 1.23 [3]   R
Luminosity 1.75 [3]   L
Surface gravity (log g)4.3 [6]   cgs
Temperature 6,000 [6]   K
Rotational velocity (v sin i)5 [6]  km/s
Age 5.6 [3]   Gyr
C or Bb
Mass 1.05 [6]   M
Radius 1.09 [5]   R
Luminosity 1.06 [5]   L
Surface gravity (log g)4.4 [6]   cgs
Temperature 5,900 [6]   K
Rotational velocity (v sin i)9 [6]  km/s
Age 11.3 [5]   Gyr
Other designations
Alkalurops, Inkalunis, Icalurus, Clava, Venabulum, μ Boo, 51 Boötis, FK5  568, ADS  9626, CCDM 15245+3722
μ1 Boo: BD+37°2636, GC  20724, GJ  3903, HD  137391, HIP  75411, HR  5733, SAO  64686
μ2 Boo: BD+37°2637, GC  20725, GJ  3904, HD  137392, HIP  75415, HR  5734, SAO  64687
Database references
SIMBAD μ1 Boo
μ2 Boo

Mu Boötis, Latinized from μ Boötis, consists of a pair of double stars in the northern constellation of Boötes, 120 light-years from the Sun.

Contents

Mu Boötis had the traditional name Alkalurops /ælkəˈljʊərɒps/ , although the International Astronomical Union now regards that name as only applying to μ1 Boötis. [11]

System

Mu Bootis (Alkalurops) as seen in a small telescope Alkalurops.jpg
Mu Bootis (Alkalurops) as seen in a small telescope

The primary pair, component A, is designated μ1 Boötis and the two components an angular separation of 0.08.[ citation needed ]

The secondary, consisting of components BC, is designated μ2 Boötis and they have a separation of 2.2″. The two double star systems are separated by 107″, with matching parallaxes and proper motions, suggesting they form a system. However, components BC have a different chemical composition compared to the A pair, indicating this may instead be a close encounter between two binary systems. [6]

Nomenclature

μ Boötis (Latinised to Mu Boötis) is the star's Bayer designation. It also bears the Flamsteed designation 51 Boötis.

The system's traditional name Alkalurops is from the Greek καλαύροψ kalaurops "a herdsman's crook or staff", with the Arabic prefix attached. [12] It has also been known as Inkalunis (from the Alfonsine tables), Clava (Latin 'the club') and Venabulum (Latin 'a hunting spear'). [13] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) [14] to catalogue and standardize proper names for stars. The WGSN approved the name Alkalurops for μ¹ Boötis on 21 August 2016 and it is now so entered in the IAU Catalog of Star Names. [11]

It is known as 七公六, Qī Gōng liù (the Sixth Star of the Seven Excellencies) in Chinese. [15]

Properties

Illustration of Mu Bootis Pos MuBoo.PNG
Illustration of Mu Boötis

μ1 Boötis is a yellow-white F-type subgiant with an apparent magnitude of +4.31.

Separated from its brighter companion by 108 arcseconds in the sky is the binary star μ2 Boötis, which has a combined spectral type of G1V and a combined brightness of +6.51 magnitudes. The components of μ2 Boötis have apparent magnitudes of +7.2 and +7.8 and are separated by 2.2 arcseconds.[ citation needed ] They complete one orbit about their common centre of mass every 260 years.

Related Research Articles

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Epsilon Boötis, officially named Izar, is a binary star in the northern constellation of Boötes. The star system can be viewed with the unaided eye at night, but resolving the pair with a small telescope is challenging; an aperture of 76 mm (3.0 in) or greater is required.

<span class="mw-page-title-main">Sigma Scorpii</span> Multiple star system in the constellation of Scorpius

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−59
 light years.

<span class="mw-page-title-main">Zeta Sagittarii</span> Triple star system in the constellation Sagittarius

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Nu<sup>1</sup> Sagittarii Triple star system in the constellation Sagittarius

Nu¹ Sagittarii is a triple star system about 1,100 light-years from Earth. Its three components are designated Nu¹ Sagittarii A, B and C. A and B themselves form a spectroscopic binary. The system is 0.11 degree north of the ecliptic.

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<span class="mw-page-title-main">Nu Capricorni</span> Binary star in the constellation Capricornus

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<span class="mw-page-title-main">Zeta Piscium</span> Star system in the constellation Pisces.

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References

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