Tau Scorpio ( τ Sco / τ Scorpii) is a star in the constellation Scorpio , approximately 430 light-years distant from Earth. It has the historical name an-Niyat (النياط an-niyāţ ), which is translated from Arabic as “artery”.
| Tau Scorpio | |||
|---|---|---|---|
| Star | |||
 Tau Scorpio magnetic field mapped using the Zeeman-Doppler effect. | |||
| Observational data ( Age J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | 430 ± 44 St. years (132 ± 14 pc ) | ||
| Visible magnitude ( V ) | + 2.78 | ||
| Constellation | Scorpio | ||
| Astrometry | |||
| Radial velocity ( R v ) | 1.7 km / s | ||
| Own movement (μ) | RA: -9.75 mas per year Dec: -22.5 mas per year | ||
| Parallax (π) | 7.59 mas | ||
| Absolute magnitude (V) | -2.85 | ||
| Specifications | |||
| Spectral class | B0V | ||
| Color Index ( B - V ) | -0.19 | ||
| Color Index ( U - B ) | -1.01 | ||
| physical characteristics | |||
| Weight | 15 M ☉ | ||
| Radius | 5 R ☉ | ||
| Temperature | 30,700 K | ||
| Luminosity | 18 000 (bolometric) L ☉ | ||
| Metallicity | 130% | ||
| Rotation | 5 km / s | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
Tau Scorpio is a blue-white giant of the main sequence of spectral class B0 and has a visible magnitude of +2.82 m . The radius is 5 times greater than the solar one; the bolometric luminosity of the star is 18,000 Suns . The temperature of the star is warmed up to 30,700 Kelvin.
The star has a very active magnetosphere , and its magnetic field was mapped using the Zeeman-Doppler effect [2] , as shown in the figure on the right.
With a mass of 15 solar , Tau Scorpio is likely to end his life as a supernova [3] .
Notes
- ↑ 1 2 3 4 Gaia Data Release 2 - 2018.
- ↑ Donati et al., 2006, MNRAS 370, 629, “The surprising magnetic topology of τ Sco: fossil remnant or dynamo output?”
- ↑ Al Niyat (Tau Scorpii) (Stars, Jim Kaler) "