Tau Scorpii

Coordinates: Sky map 16h 35m 52.9537s, −28° 12′ 57.658″
Source: Wikipedia, the free encyclopedia.
Not to be confused with T Scorpii.
Tau Scorpii
Location of τ Scorpii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation
Scorpius
Right ascension 16h 35m 52.95285s[1]
Declination −28° 12′ 57.6615″[1]
Apparent magnitude (V) +2.82[2]
Characteristics
Spectral type B0.2 V[3]
U−B color index −1.039[2]
B−V color index −0.252[2]
Distance
470 ± 40 ly
(150 ± 10 pc)
Absolute magnitude (MV)−4.2[5]
Details
Myr
HR 6165, SAO 184481[12]
Database references
SIMBADdata

Tau Scorpii,

apparent visual magnitude of Tau Scorpii is +2.8,[2] while parallax measurements yield a distance estimate of roughly 470 light-years (150 parsecs) from Earth.[1]

Description

Surface magnetic field of Tau Scorpii as reconstructed by means of Zeeman–Doppler imaging

Compared to the

magnetic star whose surface magnetic field was mapped by means of Zeeman–Doppler imaging.[15] Tau Scorpii is rotating relatively slowly with a period of 41 days.[10]

The

Auger ionization effect. Observations with the ROSAT space telescope showed it has a higher energy (harder) X-ray spectrum than is usual for B0 V stars. Over the energy range 0.8–1.2 keV, its X-ray luminosity is Lx = 1.8 × 1031 erg s−1 with a large Lx to Lbol of log Lx/Lbol = –6.53 from ASCA measurements. ROSAT measurements showed a log Lx/Lbol ≃ –5.93 for the range 0.1–2.4 keV.[14] The hard component of the X-ray spectrum from τ Sco as studied with XMM-Newton supports the presence of in-falling clumps of plasma in τ Sco.[14]

This star is a proper motion member of the Upper Scorpius subgroup of the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun.[5][7] The Upper Scorpius subgroup contains thousands of young stars with mean age 11 million years at average distance of 470 light years (145 parsecs)

HR diagram position for Tau Scorpii estimates its effective temperature to be 29,850 K with a luminosity of 20,400 L☉, consistent with an isochronal age of 5 million years and an estimated mass of 14.5–14.7 solar masses
.

Nomenclature

τ Scorpii (Latinised to Tau Scorpii) is the star's Bayer designation.

Tau Scorpii and Sigma Scorpii together bore the traditional name Al Niyat (or Alniyat) derived from the Arabic النياط al-niyāţ "the arteries" and referring to their position flanking the star Antares, the scorpion's heart, with Tau Scorpii being the star to the south.[16]

Paikauhale is the Hawaiian name for Tau Scorpii.[17][18] In the Hawaiian dictionary by Pukuʻi & Elbert (1986), the word paikauhale [ˈpəiˈkəuˈhale] is defined as to go gadding about from house to house. In another Hawaiian dictionary (H.W. Kent, 1993, "Treasury of Hawaiian Words in One Hundred and One Categories", p.367), paikauhale is defined as Vagabond owning no home; house-to-house wanderer.

In 2016, the IAU organized a Working Group on Star Names (WGSN)[19] to catalog and standardize proper names for stars. The WGSN approved the name Paikauhale for the star A on 10 August 2018 and it is now so included in the List of IAU-approved Star Names.[20] The name Alniyat was given to Sigma Scorpii.

Cultural signification

The indigenous Boorong people of northwestern Victoria saw this star (together with σ Sco) as wives of Djuit (Antares).[21]

In

Chinese name for τ Scorpii itself is 心宿三 (Xīn Xiù sān), "the Third Star of Heart".[23]

References

  1. ^
    S2CID 18759600
  2. ^
    doi:10.1086/190168
  3. ^
    S2CID 14115701
  4. Bibcode:1999VeARI..35....1W
  5. ^
    Bibcode:1989A&A...216...44D
  6. ^
    S2CID 118629873
  7. ^
    S2CID 118461108
    .
  8. ^
    Bibcode:1994A&A...282..867K
  9. ^
    S2CID 14969137
  10. ^
    doi:10.1007/s00159-009-0020-6
  11. CDS ID [1]
    . Accessed on line February 8, 2013.
  12. ^ "tau Sco -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2010-08-01
  13. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2013-12-03, retrieved 2012-01-16
  14. ^
    doi:10.1051/0004-6361:20021577
  15. S2CID 7054292
  16. ISBN 0-486-21079-0
    .
  17. ^ Kawena, Johnson, & Ruggles, 2015, "Na Inoa Hoku: Hawaiian and Pacific Star Names", p.201
  18. ^ Puku'i & Elbert, 1986, "Hawaiian Dictionary: Hawaiian-English, English-Hawaiian", p.31
  19. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 17 September 2018.
  20. ^ "IAU Catalog of Star Names". International Astronomical Union. Retrieved 2018-09-17.
  21. S2CID 118454721
    .
  22. ISBN 978-986-7332-25-7
    .
  23. ^ (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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