Mu1 Scorpii

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For other stars with this
μ Scorpii
.
μ1 Scorpii
Location of μ1 Scorpii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation
Scorpius
Right ascension 16h 51m 52.23111s[1]
Declination −38° 02′ 50.5694″[1]
Apparent magnitude (V) 2.94 - 3.22[2]
Characteristics
Spectral type B1.5 V + B6.5 V[3]
U−B color index −0.859[4]
B−V color index −0.202[4]
Variable type β Lyr[2]
Distance
approx. 500 ly
(approx. 150 pc)
Absolute magnitude (MV)−2.9±0.3[3]
Periastron epoch (T)
2412374.434 HJD
Details
Rotational velocity
(v sin i)		165.0 km/s
SAO 208102, WDS
16519-3803
Database references
SIMBADdata

Mu1 Scorpii (μ1 Scorpii, abbreviated Mu1 Sco, μ1 Sco) is a

OB association of co-moving stars to the Sun.[3]

The primary (Mu1 Scorpii Aa) is formally named Xamidimura /ˌkæmidiˈmʊərə/, from the Khoekhoe xami di mûra [xami ti mũːɾa] 'the (two) eyes of the lion'.[8]

Properties

A light curve for Mu1 Scorpii, plotted from TESS data[9]

Mu1 Scorpii is an eclipsing binary of the Beta Lyrae type. Discovered to be a spectroscopic binary by Solon Irving Bailey in 1896, it was only the third such eclipsing pair to be discovered. This is a semidetached binary system where the secondary is close to filling its Roche lobe, or it may even be overflowing. The two stars revolve each other along a circular orbit with the components separated by 12.9 times the Sun's radius.[3] Due to occultation of each component by the other, the apparent magnitude of the system decreased by 0.3 and 0.4 magnitudes over the course of the binary's orbit, which takes 34 hours 42.6 minutes to complete.

The primary component is a

mass of the Sun and 3.9 times the Sun's radius. The secondary is a smaller B-type main sequence star with a classification of about B6.5 V, having 3.6 times the Sun's mass and 4.6 times the radius of the Sun. The effective temperature of the outer atmosphere for each star is 24,000 K for the primary and 17,000 K for the secondary. At these temperatures, the two stars glow with a blue-white hue.[10]

Nomenclature

μ1 Scorpii (Latinised to Mu1 Scorpii) is the system's Bayer designation. The designations of the primary as Mu1 Scorpii Aa derives from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[11]

The pair of stars Mu1 and

Khoikhoi people of South Africa.[12]

In 2016, the IAU organized a

Pipirima for the partner of Mu1 Scorpii) and it is now so included in the List of IAU-approved Star Names.[8]

In

Chinese name for Mu1 Scorpii itself is 尾宿一 (Wěi Xiù yī), "the First Star of Tail".[16]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    S2CID 125853869
    .
  3. ^
    S2CID 119206034
    .
  4. ^
    doi:10.1086/190168
    .
  5. Bibcode:1953GCRV..C......0W
    .
  6. doi:10.1093/mnras/staa2053
    .
  7. doi:10.1093/mnras/stv234
    .
  8. ^ a b "Naming Stars". IAU.org. Retrieved 16 December 2017.
  9. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  10. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. Archived from the original
    on March 18, 2012. Retrieved 2012-01-16.
  11. arXiv:1012.0707 [astro-ph.SR
    ].
  12. ^ Astronomical Society of Southern Africa (2013) African ethnoastronomy
  13. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  14. ^ "WG Triennial Report (2015-2018) - Star Names" (PDF). p. 5. Retrieved 2018-07-14.
  15. ISBN 978-986-7332-25-7
    .
  16. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2008-10-25 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
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