Aldebaran
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]
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 |
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] cgs |
Temperatur | 3,910[5] K |
Metallicity | 70% Sun[3] |
Metallicity [Fe/H] | –0.34[5] dex |
Rotation | 643 days[6] |
Ither designations | |
Database references | |
SIMBAD | data |
ARICNS | data |
In 1997 a substellar companion wis reportit but subsequent observations hae nae confirmed this claim.
References eedit
- ↑ a b c d e f g "V* alf Tau -- Variable Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 16 December 2009.
- ↑ a b "Query alf Tau". General Catalogue of Variable Stars. Centre de Données astronomiques de Strasbourg. Retrieved 16 December 2009.
- ↑ a b c James B. Kaler (22 Mey 2009). "Aldebaran". Stars. Archived frae the original on 10 Januar 2010. Retrieved 20 December 2009. Unknown parameter
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ignored (help) - ↑ 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☉.
- ↑ a b c d 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
- ↑ 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
- ↑ "Oxford Dictionary: Aldebaran". Archived frae the original on 9 Juin 2015. Retrieved 24 Julie 2013. Archived 2015-06-09 at the Wayback Machine
- ↑ Merriam-Webster: Aldebaran