↑Carney, Bruce W.؛ و دیگران ((March 2008)). «Rotation and Macroturbulence in Metal-poor Field Red Giant and Red Horizontal Branch Stars». Astronomical Journal 135 (3): ۸۹۲–۹۰۶. doi:10.1088/0004-6256/135/3/892. تاریخ وارد شده در |تاریخ= را بررسی کنید (کمک); پارامتر |access-date= نیاز به وارد کردن |url= دارد (کمک)نگهداری یادکرد:استفاده از et al. (رده)
↑«UBVRIJKL Photometry of the Bright Stars». Communications of the Lunar and Planetary Laboratory, Volume 4, Part 1, p.99-110. ۱۹۶۶. بیبکد:1966CoLPL...4...99J. پارامتر |access-date= نیاز به وارد کردن |url= دارد (کمک)
Alpha Ursae Majoris (Latinised from α Ursae Majoris, abbreviated Alpha UMa, α UMa), also called Dubhe, is, despite being designated "α" (alpha), the second-brightest object in the constellation of Ursa Major.
Alpha Ursae Majoris forms part of the Big Dipper (also known as the Plough or the Great Bear), and is the northern of the 'pointers' (or 'guards'), the two stars of Ursa Major which point towards Polaris, the North Star.
There is another spectroscopic binary 8 arcminutes distant, a 7th magnitude pair showing an F8 spectral type. It is sometimes referred to as Alpha Ursae Majoris C, but is separately catalogued as HD 95638.
α Ursae Majoris has been reported to vary in brightness by about a thousandth of a magnitude. Ten radial oscillation modes have been detected, with periods between 6.4 hours and 6.4 days.
Although it is part of the constellation of Ursa Major, it is not part of the Ursa Major Moving Group of stars that have a common motion through space.
α Ursae Majoris (Latinised to Alpha Ursae Majoris) is the star system's Bayer designation.
It bore the traditional names Dubhe and Ak.Dubhe derives from the Arabic for 'bear', dubb, from the phrase ظهر الدب الاكبرżahr ad-dubb al-akbar 'the back of the Greater Bear'. The rarer Ak means 'The Eye'. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016 included a table of the first two batches of names approved by the WGSN; which included Dubhe for the star α Ursae Majoris A.
In Chinese, 北斗 Běi Dǒu, meaning Northern Dipper, refers to an asterism equivalent to the Big Dipper. Consequently, the Chinese name for Alpha Ursae Majoris itself is 北斗一 Běi Dǒu yī, (English: the First Star of Northern Dipper) and 天樞 Tiān Shū, (English: Star of Celestial Pivot).
^ abcJohnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J
^ abcdGuenther, D. B.; Demarque, P.; Buzasi, D.; Catanzarite, J.; Laher, R.; Conrow, T.; Kreidl, T. (2000). "Evolutionary Model and Oscillation Frequencies for α Ursae Majoris: A Comparison with Observations". The Astrophysical Journal. 530 (1): L45–L48. Bibcode:2000ApJ...530L..45G. doi:10.1086/312473. PMID10642202.
^Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.