Astronomy:47 Tauri

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Short description: Star in the constellation Taurus
47 Tauri
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas
Distance330 ± 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
Radius12.9[7] R
Surface gravity (log g)2.67 ± 0.11[6] cgs
Temperature5117 ± 58[6] K
Metallicity [Fe/H]-0.10 ± 0.08[6] dex
Other designations
Database references
SIMBAD47 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. 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode2007A&A...474..653V. http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL. 
  2. 2.0 2.1 2.2 "* 47 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+47+Tau. 
  3. 3.0 3.1 3.2 "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6. 
  4. Stephenson, C. B.; Sanwal, N. B. (1969). "The masses of stars above the main sequence". The Astronomical Journal 74: 689. doi:10.1086/110845. Bibcode1969AJ.....74..689S. 
  5. 5.0 5.1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode1986EgUBV........0M. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1. 
  6. 6.0 6.1 6.2 6.3 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. doi:10.1088/0004-637X/736/2/87. Bibcode2011ApJ...736...87K. 
  7. 7.0 7.1 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. doi:10.1051/0004-6361:20000451. Bibcode2001A&A...367..521P.