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]
Chairactereestics
Spectral type K5III[1]
Apparent magnitude (J) -2.10[1]
U−B colour index 1.90
B−V colour index 1.54
Variable teep 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
Distance65 ± 1 ly
(20.0 ± 0.4 pc)
Absolute magnitude (MV)−0.63
Details
Mass1.7[3] M
Radius44.2 ± 0.9[4] R
Luminosity518 ± 32[5] L
Surface gravity (log g)1.59[5] cgs
Temperatur3,910[5] K
Metallicity70% Sun[3]
Metallicity [Fe/H]–0.34[5] dex
Rotation643 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
SIMBADdata
ARICNSdata

Aldebaran /ælˈdɛbərən/[7][8] (α Tau, α Tauri, Alpha Tauri) is a red 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 " Three 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 16 December 2009.
  2. 2.0 2.1 "Query alf Tau". General Catalogue of Variable Stars. Centre de Données astronomiques de Strasbourg. Retrieved 16 December 2009.
  3. 3.0 3.1 3.2 James B. Kaler (22 Mey 2009). "Aldebaran". Stars. Archived frae the original on 10 Januar 2010. Retrieved 20 December 2009. Unknown parameter |deadurl= ignored (help)
  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.; et al. (Februar 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, C. (Januar 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