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- Tau_Scorpii abstract "Tau Scorpii is a star in the southern zodiac constellation of Scorpius. It has the traditional name Alniyat or Al Niyat, which it shares with σ Scorpii. The name derives from the Arabic النياط an-niyāţ meaning "the arteries". The apparent visual magnitude of Tau Scorpii is +2.8, while parallax measurements yield a distance estimate of roughly 470 light-years (150 parsecs) from Earth.Compared to the Sun, Tau Scorpii is a massive OB star with 15 times the Sun's mass and more than six times the radius of the Sun. It is radiating about 18,000 times the Sun's luminosity from its outer envelope at an effective temperature of 31,440 K. This gives it the blue-white hue characteristic of B-type stars. As yet there is no evidence of a companion in orbit around τ Sco. It is a magnetic star whose surface magnetic field was mapped by means of Zeeman–Doppler imaging. Tau Scorpii is rotating relatively slowly with a period of 41 days.The spectrum of this star shows triply-ionized oxygen (O IV) that is being generated by X-rays and 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. 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.This star is a proper motion member of the Upper Scorpius subgroup of theScorpius-Centaurus OB association,the nearest such co-moving association of massive stars to the Sun.The Upper Scorpius subgroup contains thousands of young stars with mean age 11 million years at average distance of 470 light years (145 parsecs) A more recent analysis of the HR diagram position for Tau Scorpii estimates its effective temperature to be 29,850 Kelvin with a luminosity of 20,400 Suns, consistent with an isochronal age of 5 million years and an estimated mass of 14.5-14.7 solar masses.".
- Tau_Scorpii thumbnail Scorpius_IAU.svg?width=300.
- Tau_Scorpii wikiPageID "2663956".
- Tau_Scorpii wikiPageRevisionID "605325125".
- Tau_Scorpii absmagV "−4.2".
- Tau_Scorpii ageMyr ",".
- Tau_Scorpii appmagV "+2.82".
- Tau_Scorpii bV "−0.252".
- Tau_Scorpii class "B0.2 V".
- Tau_Scorpii constell Scorpius.
- Tau_Scorpii epoch "J2000".
- Tau_Scorpii gravity "4.24".
- Tau_Scorpii hasPhotoCollection Tau_Scorpii.
- Tau_Scorpii luminosity "1800020400".
- Tau_Scorpii mass ",".
- Tau_Scorpii metalFe "−0.14".
- Tau_Scorpii pError "0.53".
- Tau_Scorpii parallax "6.88".
- Tau_Scorpii propMoDec "−22.83".
- Tau_Scorpii propMoRa "−9.89".
- Tau_Scorpii radialV "+2.0".
- Tau_Scorpii radius "6.5".
- Tau_Scorpii rotation "3542400.0".
- Tau_Scorpii rotationalVelocity "24".
- Tau_Scorpii temperature "3144029850".
- Tau_Scorpii uB "−1.039".
- Tau_Scorpii subject Category:Astronomical_X-ray_sources.
- Tau_Scorpii subject Category:B-type_main-sequence_stars.
- Tau_Scorpii subject Category:Bayer_objects.
- Tau_Scorpii subject Category:Scorpius_(constellation).
- Tau_Scorpii subject Category:Stars_with_proper_names.
- Tau_Scorpii type B-typeMainSequenceStars.
- Tau_Scorpii type BayerObjects.
- Tau_Scorpii type CelestialBody109239740.
- Tau_Scorpii type NaturalObject100019128.
- Tau_Scorpii type Object100002684.
- Tau_Scorpii type PhysicalEntity100001930.
- Tau_Scorpii type Star109444100.
- Tau_Scorpii type StarsWithProperNames.
- Tau_Scorpii type Whole100003553.
- Tau_Scorpii type CelestialBody.
- Tau_Scorpii type Star.
- Tau_Scorpii type PhysicalBody.
- Tau_Scorpii comment "Tau Scorpii is a star in the southern zodiac constellation of Scorpius. It has the traditional name Alniyat or Al Niyat, which it shares with σ Scorpii. The name derives from the Arabic النياط an-niyāţ meaning "the arteries".".
- Tau_Scorpii label "Tau Scorpii".
- Tau_Scorpii label "Tau Scorpii".
- Tau_Scorpii label "Tau Scorpii".
- Tau_Scorpii label "Tau Scorpii".
- Tau_Scorpii label "Tau Scorpii".
- Tau_Scorpii label "Tau Scorpii".
- Tau_Scorpii label "Tau Scorpii".
- Tau_Scorpii label "Тау Скорпиона".
- Tau_Scorpii label "さそり座タウ星".
- Tau_Scorpii label "心宿三".
- Tau_Scorpii sameAs Tau_Scorpii.
- Tau_Scorpii sameAs Tau_Scorpii.
- Tau_Scorpii sameAs Tau_Scorpii.
- Tau_Scorpii sameAs Tau_Scorpii.
- Tau_Scorpii sameAs さそり座タウ星.
- Tau_Scorpii sameAs Tau_Scorpii.
- Tau_Scorpii sameAs Tau_Scorpii.
- Tau_Scorpii sameAs m.07w9t9.
- Tau_Scorpii sameAs Q1571090.
- Tau_Scorpii sameAs Q1571090.
- Tau_Scorpii sameAs Tau_Scorpii.
- Tau_Scorpii wasDerivedFrom Tau_Scorpii?oldid=605325125.
- Tau_Scorpii depiction Scorpius_IAU.svg.
- Tau_Scorpii isPrimaryTopicOf Tau_Scorpii.
- Tau_Scorpii name "Tau Scorpii".