Elnath

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Star
Elnath (β Tauri)
Elnath in the constellation Taurus
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation bull
Right ascension 05 h 26 m 18 s
declination + 28 ° 36 ′ 27 ″
Apparent brightness 1.65 mag
Typing
B − V color index −0.13 
U − B color index −0.51 
R − I index −0.10 
Spectral class B7 III
Astrometry
Radial velocity 9.2 ± 2 km / s
parallax 24.36 ± 0.34  mas
distance 134 ± 2  ly
41.1 ± 0.6  pc
Proper movement 
Rec. Share: 22.76 ± 0.42  mas / a
Dec. portion: −173.58 ± 0.18  mas / a
Physical Properties
Dimensions 5.0 ± 0.1  M ☉
radius 4.6  R ☉
Luminosity

700  L ☉

Effective temperature 13600  K
Metallicity [Fe / H] +0.08
Age 100 ± 10 million  a
Other names
and catalog entries
Bayer name β Tauri
Flamsteed name 112 Tauri
Bonn survey BD + 28 ° 795
Bright Star Catalog HR 1791 [1]
Henry Draper Catalog HD 35497 [2]
Hipparcos catalog HIP 25428 [3]
SAO catalog SAO 77168 [4]
Tycho catalog TYC 1859-1470-1 [5]
2MASS catalog 2MASS J05261751 + 2836271 [6]
Other names γ Aurigae, FK5 202

Elnath (from Arabic النطح, DMG an-naṭḥ  , the horn ') is the proper name of the star β Tauri (Beta Tauri). It represents one of the two horn tips of the mythological celestial bull (the other is ζ Tauri ).

Ptolemy assigned Elnath to the constellation Fuhrmann , Johann Bayer assigned him to both constellations and named them Beta Tauri and Gamma Aurigae (γ Aur). Due to the definition of the modern constellation borders in 1930, the term γ Aur is no longer used.

Elnath is a blue-white star of the spectral type B7 with an apparent magnitude of +1.7 mag, making it one of the 50 brightest stars in the night sky. It is just over 130 light years away. The star has about 700 times the luminosity of the sun and, as a mercury-manganese star, is one of the peculiar stars .

See also

Individual evidence

  1. ↑ a b Hipparcos catalog (ESA 1997)
  2. ↑ a b c d e f g bet Tau. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed August 26, 2018 .
  3. ↑ a b Markus Janson, Mariangela Bonavita, Hubert Klahr, David Lafrenière, Ray Jayawardhana, Hans Zinnecker: High-contrast Imaging Search for Planets and Brown Dwarfs around the Most Massive Stars in the Solar Neighborhood . In: The Astrophysical Journal . 736, No. 2, August 2011, p. 89. arxiv : 1105.2577 . bibcode : 2011ApJ ... 736 ... 89J . doi : 10.1088 / 0004-637X / 736/2/89 .
  4. ↑ a b c d Elnath (Beta Tauri). Jim Kaler, accessed August 26, 2018 .
  5. ↑ S Ghazanchyan, G Alecian: Statistical analysis from recent abundance determinations in Hg Mn stars . In: Monthly Notices of the Royal Astronomical Society . 460, No. 2, 2016, p. 1912. bibcode : 2016MNRAS.460.1912G . doi : 10.1093 / mnras / stw911 .
  6. ↑ Bayer's Uranometria