Mu Boötis

{{short description|Pair of double stars in the northern constellation of Boötes}}

{{Starbox begin

| name=Mu Boötis

}}

{{Starbox image

| image ={{Location map|100x100

|AlternativeMap=Boötes IAU.svg

|caption=

|alt=Diagram showing star positions and boundaries of the Boötes constellation and its surroundings

|width=250

|lat=64.5 |long=30.6

|mark=Cercle rouge 100%.svg | marksize=12

|float=center

}}| caption=Location of μ Boötis (circled)

}}

{{Starbox observe 3s

| epoch=J2000

| constell=Boötes

| component1=A

| ra1={{RA|15|24|29.43147}}

| dec1={{DEC|+37|22|37.7613}}

| appmag_v1=4.31

| component2=B or Ba

| ra2={{RA|15|24|30.86726}}

| dec2={{DEC|+37|20|50.2761}}

| appmag_v2=6.98

| component3=C or Bb

| ra3={{RA|15|24|30.89704}}

| dec3={{DEC|+37|20|52.555}}

| appmag_v3=7.63

}}

{{Starbox character

| component1 = Mu¹ Boötis

| class=F2IV

| r-i = 0.15

| b-v = +0.31

| u-b = +0.06

| component2 = Mu² Boötis

| class2 = F9V + G0V

| b-v2 = +0.59

| u-b2 = +0.13

}}

{{Starbox astrometry

| component1 = A

| radial_v = {{Val|−8.60|0.3}}

| prop_mo_ra = −149.928

| prop_mo_dec = +89.573

| parallax = 26.5759

| p_error = 0.7871

| parallax_footnote =

| absmag_v=1.47

}}

{{Starbox astrometry|no_heading=y

| component1 = B or Ba

| radial_v =

| prop_mo_ra = −139.142

| prop_mo_dec = +90.281

| parallax = 27.2223

| p_error = 0.0168

| parallax_footnote =

| absmag_v=

}}

{{Starbox astrometry|no_heading=y

| component1 = C or Bb

| radial_v =

| prop_mo_ra = −152.149

| prop_mo_dec = +89.593

| parallax = 27.2126

| p_error = 0.0181

| parallax_footnote =

| absmag_v=

}}

{{Starbox orbit

| reference =

| primary = Aa

| name=Ab

| period=3.75

| axis=0.099

| eccentricity=0.270

| inclination=129.7

| node=129.4

| periarg=43.5

| periastron=1006.33

}}

{{Starbox orbit

| reference =

| primary = B

| name=C

| period=265

| axis=1.46

| eccentricity=0.585

| inclination=135.5

| node=174

| periarg=338

| periastron=1864.9

}}

{{Starbox detail

| component1 = Aa

| mass = 1.6

| radius = 1.9

| luminosity = 20

| temperature = 7,000

| metal_fe =

| gravity = 3.4

| rotational_velocity = 89

| age_gyr=

}}

{{Starbox detail|no_heading=y

| component1 = Ab

| mass = 1.5

| radius =

| luminosity =

| temperature = 7,000

| metal_fe =

| gravity = 3.6

| rotational_velocity = 40

| age_gyr=

}}

{{Starbox detail|no_heading=y

| component1 = B or Ba

| mass = 1.24

| radius = 1.23

| luminosity = 1.75

| temperature = 6,000

| metal_fe =

| gravity = 4.3

| rotational_velocity = 5

| age_gyr = 5.6

}}

{{Starbox detail|no_heading=y

| component1 = C or Bb

| mass = 1.05

| radius = 1.09

| luminosity = 1.06

| temperature = 5,900

| metal_fe =

| gravity = 4.4

| rotational_velocity = 9

| age_gyr = 11.3

}}

{{Starbox catalog

| names = {{odlist | name=Alkalurops | name2=Inkalunis | name3=Icalurus | name4=Clava | name5=Venabulum | ADS=9626 | B=μ Boo | F=51 Boötis | FK5=568 | CCDM=15245+3722 }}

| component1=μ¹ Boo

| names1={{odlist | BD=+37°2636 | GJ=3903 | HD=137391 | HIP=75411 | HR=5733 | SAO=64686 | GC=20724 }}

| component2=μ² Boo

| names2={{odlist | BD=+37°2637 | GJ=3904 | HD=137392 | HIP=75415 | HR=5734 | SAO=64687 | GC=20725 }}

}}

{{Starbox reference

| Simbad=mu.+Boo | sn=μ¹ Boo

| Simbad2=51+Boo+B | sn2=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.

Mu Boötis had the traditional name Alkalurops {{IPAc-en|æ|l|k|ə|ˈ|lj|ʊər|ɒ|p|s}}, although the International Astronomical Union now regards that name as only applying to μ¹ Boötis.

System

File:Alkalurops.jpg

The primary pair, component A, is designated μ¹ Boötis and the two components an angular separation of 0.08″.{{cn|date=April 2023}}

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.

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. It has also been known as Inkalunis (from the Alfonsine tables), Clava (Latin 'the club') and Venabulum (Latin 'a hunting spear'). In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) 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.

It is known as 七公六, Qī Gōng liù (the Sixth Star of the Seven Excellencies) in Chinese.{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0606/ap060626.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 26 日] {{Webarchive|url=https://web.archive.org/web/20110522121442/http://aeea.nmns.edu.tw/2006/0606/ap060626.html |date=2011-05-22 }}

Properties

Image:Pos MuBoo.PNG

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.{{cn|date=April 2023}} They complete one orbit about their common centre of mass every 260 years.

References

{{reflist|refs=

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{{citation | postscript=.

| author=Mamajek, Eric |display-authors=etal | date=June 30, 2017

| publisher=IAU Division C Working Group on Star Names

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| title=IAU Catalog of Star Names | access-date=28 July 2016 }}

{{citation

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| publisher=International Astronomical Union

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{{citation

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{{citation

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| title=Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars

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| volume=85 | issue=3 | pages=1015–1019 | date=November 1990

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}}

External links

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%205733 HR 5733]
[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%205734 HR 5734]
[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?CCDM%20J15245%2b3722A CCDM J15245+3722]
[http://aladin.u-strasbg.fr/AladinPreview?-c=15+24+29.4278%2B37+22+37.800&ident=NSV++7063&submit=Aladin+previewer Image Mu Boötis]

Category:G-type main-sequence stars

Category:F-type subgiants

Category:Triple star systems