Lambda Scorpii

Coordinates: Sky map 17h 33m 36.520s, −37° 06′ 13.76″
Source: Wikipedia, the free encyclopedia.
λ Scorpii
Location of λ Scorpii (circled)
Observation data
J2000
Constellation Scorpius
Pronunciation
 /ˈʃɔːlə/[1][2]
Right ascension 17h 33m 36.520s[3]
Declination −37° 06′ 13.76″[3]
Apparent magnitude (V) 1.62 + 14.9 + 12.0[3][4]
Characteristics
Spectral type B1.5IV + B2IV[5][6]
U−B color index −0.880[7]
B−V color index −0.240[7]
Variable type Beta Cephei (A)[8]
Distance
approx. 570 ly
(approx. 180 pc)
Absolute magnitude (MV)−3.70[10]
Inclination
(i)		77.2°
Semi-amplitude
(K1)
(primary)		39.3 km/s
Details
λ Sco Aa
Rotational velocity (v sin i)
150[8] km/s
λ Sco B
Mass8.1[5] M☉
Radius4.7±1.0[8] R☉
Surface gravity (log g)4.0[6] cgs
Temperature25,000±1,000[8] K
λ Sco Ab
Mass1.8[5] M☉
HR 6527, SAO 208954, CCDM
J17336-3706A/B/C
Database references
SIMBADdata

Lambda Scorpii is a triple

apparent visual magnitude of 1.62, it is one of the brightest stars in the night sky
.

Nomenclature

λ Scorpii (Latinised to Lambda Scorpii) is the star system's Bayer designation.

It bore the traditional name Shaula, which comes from the Arabic الشولاء al-šawlā´ meaning 'the raised [tail]', as it is found in the tail of Scorpius, the scorpion. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[12] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[13] included a table of the first two batches of names approved by the WGSN, which included Shaula for the star λ Scorpii Aa.

In Indian Astronomy it is called MulA Nakshathram. Mūla ("root") (Devanagari मूल/मूळ) (Tamil: மூலம்) is the 19th nakshatra or "lunar mansion" in Vedic astrology. The symbol of Mula is a bunch of roots tied together (reticulated roots) or an 'elephant goad' (ankusha).[citation needed]

In

Chinese name for λ Scorpii itself is 尾宿八 (Wěi Xiù bā), "the Eighth Star of Tail".[15]

Together with υ Scorpii (Lesath), Shaula is listed in the Babylonian compendium MUL.APIN as dSharur4 u dShargaz, meaning "Sharur and Shargaz".[16]

In Coptic, they were called Minamref.[17]

The indigenous

Victoria (Australia) named it (together with Upsilon Scorpii) Karik Karik,[18] "the Falcons".[19]

Properties

A light curve for Lambda Scorpii, plotted from TESS data.[20] The large dips in brightness are eclipses, and the rapid oscillations show the Beta Cephei variability.

Lambda Scorpii is located some 570 light-years away from the Sun.

Spectroscopic and

plane, strongly suggesting that they were formed at the same time. The masses of the primary, pre-main-sequence star and the B companion are 14.5, 2.0 and 10.6 solar masses
, respectively. The age of the system is estimated to be in the range 10–13 million years.

A 15th-

Gaia Data Release 3 reports that the fainter of these two stars is a little larger and brighter than the sun and about 420 light years away,[21] while the brighter star is a luminous background object.[22]

In culture

Shaula appears on the flag of Brazil, symbolizing the state of Rio Grande do Norte.

USS Shaula (AK-118) was a U.S. Navy Crater-class cargo ship
named after the star.

References

  1. ISBN 978-1-931559-44-7
    .
  2. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.
  3. ^
    S2CID 18759600
    .
  4. doi:10.1086/374771
    .
  5. ^
    S2CID 13971499
    .
  6. ^
    hdl:2066/60554
    .
  7. ^
    S2CID 122459090
    .
  8. ^
    S2CID 56403146
    .
  9. S2CID 119231169
    .
  10. doi:10.1093/mnras/172.1.191
    .
  11. ^
    S2CID 119047709
    .
  12. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  13. ^ "Bulletin of the IAU Working Group on Star Names, No. 1" (PDF). Retrieved 28 July 2016.
  14. ISBN 978-986-7332-25-7
    .
  15. ^ (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.
  16. Bibcode:1998JBAA..108....9R
    .
  17. ISBN 978-0-486-23673-5
    .
  18. S2CID 118454721
    .
  19. Bibcode:1857PPIVT...2..137S
    .
  20. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  21. S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  22. S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
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