Aldebaran

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Aldebaran
Taurus constellation map.svg
The poseetion o Aldebaran in the Taurus constellation.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Richt ascension 04h 35m 55.239s[1]
Declination +16° 30′ 33.49″[1]
Apparent magnitude (V) 0.75-0.95[2]
Characteristics
Spectral type K5III[1]
Apparent magnitude (J) -2.10[1]
U−B colour index 1.90
B−V colour index 1.54
Variable type LB[2]
Astrometry
Radial velocity (Rv) +54.26 ±0.03[1] km/s
Proper motion (μ) RA: 62.78 ±0.89[1] mas/yr
Dec.: −189.35 ±0.58[1] mas/yr
Parallax (π) 50.09 ± 0.95 mas
Distance 65 ± 1 ly
(20.0 ± 0.4 pc)
Absolute magnitude (MV) −0.63
Details
Mass 1.7[3] M
Radius 44.2 ± 0.9[4] R
Luminosity 518 ± 32[5] L
Surface gravity (log g) 1.59[5]
Temperatur 3,910[5] K
Metallicity 70% Sun[3]
Metallicity [Fe/H] –0.34[5] dex
Rotation 643 days[6]
Ither designations
87 Tauri, Alpha Tauri, BD +16°629, GJ 171.1, GJ 9159, HD 29139, HIP 21421, HR 1457, SAO 94027
Database references
SIMBAD data
ARICNS data

Aldebaran /ælˈdɛbərən/[7][8] (α Tau, α Tauri, Alpha Tauri) is a reid giant starn locatit aboot 68 licht years awa in the zodiac constellation o Taurus. Wi an average apparent magnitude o 0.87 it is the brichtest starn in the constellation an is ane o the brichtest starns in the nichttime sky. The name Aldebaran is Arabic (الدبران al-dabarān) an translates leeterally as "the follaeer", presumably acause this bricht starn appears tae follae the Pleiades, or "Seven Sisters" star cluster in the nicht sky.[3]

In 1997 a substellar companion wis reportit but subsequent observations hae nae confirmed this claim.

References[eedit | eedit soorce]

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "V* alf Tau -- Variable Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2009-12-16. 
  2. 2.0 2.1 "Query= alf Tau". General Catalogue of Variable Stars. Centre de Données astronomiques de Strasbourg. Retrieved 2009-12-16. 
  3. 3.0 3.1 3.2 James B. Kaler (May 22, 2009). "Aldebaran". Stars. Archived from the original on 10 January 2010. Retrieved 2009-12-20. 
  4. Richichi, A.; Roccatagliata, V. (2005). "Aldebaran's angular diameter: How well do we know it?". Astronomy & Astrophysics 433 (1): 305–312. arXiv:astro-ph/0502181. Bibcode:2005A&A...433..305R. doi:10.1051/0004-6361:20041765. "We derive an average value of 19.96±0.03 milliarcsec for the uniform disk diameter. The corresponding limb-darkened value is 20.58±0.03 milliarcsec, or 44.2±0.9 R." 
  5. 5.0 5.1 5.2 5.3 Piau, L. (February 2011), "Surface convection and red-giant radius measurements", Astronomy and Astrophysics 526: A100, arXiv:1010.3649, Bibcode:2011A&A...526A.100P, doi:10.1051/0004-6361/201014442 
  6. Koncewicz, R.; Jordan (January 2007), "OI line emission in cool stars: calculations using partial redistribution", Monthly Notices of the Royal Astronomical Society 374 (1): 220–231, Bibcode:2007MNRAS.374..220K, doi:10.1111/j.1365-2966.2006.11130.x 
  7. Oxford Dictionary: Aldebaran
  8. Merriam-Webster: Aldebaran