47 Tauri

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47 Tauri
Observation data
Epoch J2000       Equinox J2000
Constellation Taurus
Right ascension 04h 13m 56.38482s [1]
Declination +09° 15′ 49.7729″ [1]
Apparent magnitude  (V)4.89 [2]
(5.05 + 7.32) [3]
Characteristics
Spectral type G5III + A7V: [4]
U−B color index +0.46 [5]
B−V color index +0.82 [5]
Astrometry
Radial velocity (Rv)-8.2 ± 0.4 [6] km/s
Proper motion (μ)RA: -10.31 [1] mas/yr
Dec.: -30.01 [1] mas/yr
Parallax (π)9.83±0.64  mas [1]
Distance 330 ± 20  ly
(102 ± 7  pc)
Orbit [3]
Period (P)479 yr
Semi-major axis (a)1.053″
Eccentricity (e)0.910
Inclination (i)128.6°
Longitude of the node (Ω)52.9°
Periastron epoch (T) B 1816.6
Argument of periastron (ω)
(secondary)		263.0°
Details
47 Tau A
Radius 12.9 [7]   R☉
Surface gravity (log g)2.67 ± 0.11 [6]   cgs
Temperature 5117 ± 58 [6]   K
Metallicity [Fe/H]-0.10 ± 0.08 [6]   dex
Other designations
BD+08°652, HD 26722, HIP 19740, HR 1311, SAO 111674
Database references
SIMBAD 47 Tau
47 Tau A
47 Tau B

47 Tauri (abbreviated to 47 Tau) is a binary star in the zodiac constellation of Taurus. Parallax measurements made by the Hipparcos spacecraft put it at a distance of about 330 light-years (102 parsecs) from Earth. The system has a combined apparent magnitude of about 4.89, [2] meaning it can be faintly seen with the naked eye, according to the Bortle scale.

47 Tauri is a visual binary, meaning that the two components can be resolved, and the orbit is derived from the positions of the two stars. The primary component is a G-type giant. Its radius is about 13 times that of the Sun. [7] The companion is likely a white-colored A-type main-sequence star that is fainter. The two stars are separated about 1.3 arcseconds away, [2] and because of their large separation, the two stars take some 479 years to complete an orbit. [3]

References

  1. 1 2 3 4 5 van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID   18759600.
  2. 1 2 3 "* 47 Tau". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2 May 2017.
  3. 1 2 3 "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 2 May 2017.
  4. ↑ Stephenson, C. B.; Sanwal, N. B. (1969). "The masses of stars above the main sequence". The Astronomical Journal. 74: 689. Bibcode:1969AJ.....74..689S. doi: 10.1086/110845 .
  5. 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  6. 1 2 3 4 Kang, Wonseok; Lee, Sang-Gak; Kim, Kang-Min (2011). "Abundances of Refractory Elements for G-Type Stars with Extrasolar Planets". The Astrophysical Journal. 736 (2): 87. arXiv: 1105.3083 . Bibcode:2011ApJ...736...87K. doi:10.1088/0004-637X/736/2/87. S2CID   118382154.
  7. 1 2 Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy & Astrophysics. 367 (2): 521–24. arXiv: astro-ph/0012289 . Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID   425754.
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