Beta Taurus ( Latin β Tauri , abbreviated β Tau ; traditional name is Nat or El-Nat ) is the second brightest star in the constellation Taurus , a white-blue giant of spectral class B7. The distance to the star is about 130 light years, its apparent magnitude is +1.65 m .
| β Taurus | |||
|---|---|---|---|
| Star | |||
| Observational data ( Age J2000) | |||
| Right ascension | |||
| Declination | |||
| Distance | 131 ± 5 St. year (40 ± 1 pc ) | ||
| Visible magnitude ( V ) | 1.65 | ||
| Constellation | Taurus | ||
| Astrometry | |||
| Radial velocity ( R v ) | +9.2 km / s | ||
| Own movement (μ) | RA: 23.28 mas per year Dec: -174.22 mas per year | ||
| Parallax (π) | 24.89 ± 0.88 mas | ||
| Absolute magnitude (V) | -1.37 | ||
| Specifications | |||
| Spectral class | B7 III | ||
| Color Index ( B - V ) | -0.13 | ||
| Color Index ( U - B ) | -0.49 | ||
| physical characteristics | |||
| Weight | 4,5 M ☉ | ||
| Radius | 5-6 R ☉ | ||
| Temperature | 13 600 K | ||
| Luminosity | 700 L ☉ | ||
| |||
| Database Information | |||
| SIMBAD | |||
The name of the star from the Arabic النطح an-naţħ is “butting”. This refers to the "butting horn of Taurus."
Ptolemy 's Almagest gives the following description: “a star at the end of the northern horn, identical with the star on the right foot of the Ascendant ”. This is one of the cases when a star was considered to belong simultaneously to two constellations. In the modern concept of constellations, this is impossible. Among the Arabs, the star was described as "the ankle of the Holding reins" (Charioteer).
Features
Nat is 4.5 times more massive than the Sun, the radius is 5-6 times greater than the solar radius. The luminosity is 700 times greater than that of the Sun, the surface temperature is 13,600 K. It moves away from the solar system at a speed of 9 km / s. It belongs to the type of chemically peculiar mercury-manganese stars .