Astronomy:Alpha Ursae Majoris

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Short description: Binary star in the constellation Ursa Major
α Ursae Majoris
Ursa Major constellation map.svg
Red circle.svg
Location of α Ursae Majoris (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Ursa Major
Right ascension  11h 03m 43.67152s[1]
Declination +61° 45′ 03.7249″[1]
Apparent magnitude (V) 1.79[2]
Characteristics
Spectral type K0III[3] + F0V[4]
U−B color index +0.93[2]
B−V color index +1.07[2]
Variable type Suspected[5]
Astrometry
Radial velocity (Rv)−9.4±0.3[6] km/s
Proper motion (μ) RA: –134.11[1] mas/yr
Dec.: –34.70[1] mas/yr
Parallax (π)26.54 ± 0.48[1] mas
Distance123 ± 2 ly
(37.7 ± 0.7 pc)
Absolute magnitude (MV)−1.10±0.04[7]
Orbit[8]
Companionα UMa B
Period (P)44.45±0.11 yr
Semi-major axis (a)0.590±0.026″
Eccentricity (e)0.439±0.004
Inclination (i)159.9±3.5°
Longitude of the node (Ω)9.3±8.2°
Periastron epoch (T)2,002.17±0.09
Argument of periastron (ω)
(secondary)		232.8±7.9°
Details[9]
α UMa A
Mass3.44±0.11 M☉
Radius17.03±0.13 R☉
Luminosity165.1±8.3 L☉
Surface gravity (log g)2.20 cgs
Temperature5,012±65 K
Metallicity [Fe/H]−0.20±0.07[10] dex
Rotational velocity (v sin i)2.6±1.0[7] km/s
Age280±30 Myr
α UMa B
Mass~1.6[3] M☉
Other designations
Dubhe, Ak, α Ursae Majoris, α UMa, Alpha UMa, 50 UMa, NSV 5070, BD+62°1161, FK5 417, GC 15185, HD 95689, HIP 54061, HR 4301, SAO 15384, PPM 17705, ADS 8035, CCDM J11037+6145AB, WDS J11037+6145AB[11]
Database references
SIMBADdata

Alpha Ursae Majoris, Latinised from α Ursae Majoris, formally named Dubhe /ˈdʌbiː/,[12][13] is, despite being designated "α" (alpha), the second-brightest object in the northern constellation of Ursa Major. This prominent asterism is known as the Big Dipper, the Plough, and the Great Bear. Alpha Ursae Majoris is the northern of the 'pointers' (or 'guards'), the second being Beta Ursae Majoris, or 'Merak' – this pair of stars point towards Polaris, the North Star.[14]

Stellar system

Dubhe A & B
α Ursae Majoris A and faint companion binaries

α Ursae Majoris is located at a distance of approximately 123 light years from the Sun, based on parallax measurements. It is a spectroscopic binary made up of the stars designated α Ursae Majoris A and α Ursae Majoris B. The pair orbit at a separation of about 23[4] astronomical units (AU) with a period of 44.5 years and an eccentricity (ovalness) of 0.44.[8] There is another spectroscopic binary at an angular separation of 7.1 arcminutes, forming a 7th magnitude pair showing an F8 spectral type with an orbital period of 6.035 days and an eccentricity of 0.09. It is sometimes referred to as Alpha Ursae Majoris C, but is separately catalogued as HD 95638.[4] Together they form a quadruple star system.[15]

Component A is the system's primary, and it is a giant star that has evolved away from the main sequence after consuming the hydrogen at its core. It is 280 million years old with 3.4 times the mass and has expanded 17 times the radius of the Sun. The star is radiating 165 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,012 K.[9] The secondary star, component B, is a main sequence star that has a stellar classification of F0V. 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.[16]

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.[17]

Nomenclature

α Ursae Majoris (Latinised to Alpha Ursae Majoris) is the star system's Bayer designation.

It bore the traditional name Dubhe, which is derived from the Arabic for 'bear', dubb, from the phrase ظهر الدب الاكبر żahr ad-dubb al-akbar 'the back of the Greater Bear'. The ancient Egyptians called it Ak, meaning 'The Eye'.[18] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[19] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[20] included a table of the first two batches of names approved by the WGSN; which included Dubhe for the star α Ursae Majoris A.

The Hindus refer to the star as Kratu, one of the Seven Rishis.[18]

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).[21]

In culture

Dubhe is the official star of the State of Utah.[22]

Dubhe was a ship in the United States Navy. The Danish National Home Guard Navy ship MHV806 is also named Dubhe.

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. 
  2. ↑ 2.0 2.1 2.2 Johnson, 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 
  3. ↑ 3.0 3.1 Guenther, D. B. et al. (2000). "Evolutionary Model and Oscillation Frequencies for α Ursae Majoris: A Comparison with Observations". The Astrophysical Journal 530 (1): L45–L48. doi:10.1086/312473. PMID 10642202. Bibcode: 2000ApJ...530L..45G. http://library2.smu.ca/xmlui/handle/01/25941. 
  4. ↑ 4.0 4.1 4.2 Tokovinin, A. A. (1997). "MSC - a catalogue of physical multiple stars". Astronomy and Astrophysics Supplement Series 124: 75–84. doi:10.1051/aas:1997181. Bibcode: 1997A&AS..124...75T. 
  5. ↑ Samus, N. N. 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. 
  6. ↑ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  7. ↑ 7.0 7.1 Carney, Bruce W. et al. (March 2008), "Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars", The Astronomical Journal 135 (3): 892–906, doi:10.1088/0004-6256/135/3/892, Bibcode: 2008AJ....135..892C 
  8. ↑ 8.0 8.1 Gray, David F. (December 2018). "Spectroscopy of the K0 Binary Giant α UMa". The Astrophysical Journal 869 (1): 14. doi:10.3847/1538-4357/aae9e6. 81. Bibcode: 2018ApJ...869...81G. 
  9. ↑ 9.0 9.1 Baines, E. et al. (2017). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer". The Astronomical Journal 155 (1): 30. doi:10.3847/1538-3881/aa9d8b. Bibcode: 2018AJ....155...30B. 
  10. ↑ McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series 74: 1075–1128, doi:10.1086/191527, Bibcode: 1990ApJS...74.1075M 
  11. ↑ "DUBHE -- Spectroscopic binary", SIMBAD (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Alpha+Ursae+Majoris, retrieved 2011-12-23 
  12. ↑ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7. 
  13. ↑ "IAU Catalog of Star Names". http://www.pas.rochester.edu/~emamajek/WGSN/IAU-CSN.txt. 
  14. ↑ Streicher, Magda (April 2009). "Plough northwards, to the Big Dipper". Monthly Notes of the Astronomical Society of South Africa 68 (3 and 4): 78–83. Bibcode: 2009MNSSA..68...78S. 
  15. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  16. ↑ Buzasi, D.; Catanzarite, J.; Laher, R.; Conrow, T.; Shupe, D.; Gautier, T. N.; Kreidl, T.; Everett, D. (2000). "The Detection of Multimodal Oscillations on α Ursae Majoris". The Astrophysical Journal 532 (2): L133–L136. doi:10.1086/312573. PMID 10715242. Bibcode: 2000ApJ...532L.133B. 
  17. ↑ Motz, Lloyd; Nathanson, Carol (1988). The Constellations: An Enthusiast's Guide To The Night Sky. Doubleday. p. 39. ISBN 978-0385176002. https://archive.org/details/constellations00motz/page/39. 
  18. ↑ 18.0 18.1 Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 438. ISBN 0-486-21079-0. https://archive.org/details/starnamestheirlo00alle/page/438. Retrieved 2012-09-04. 
  19. ↑ "IAU Working Group on Star Names (WGSN)". https://www.iau.org/science/scientific_bodies/working_groups/280/. 
  20. ↑ "Bulletin of the IAU Working Group on Star Names, No. 1". http://www.pas.rochester.edu/~emamajek/WGSN/WGSN_bulletin1.pdf. 
  21. ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 15 日
  22. ↑ "Pioneer - Utah State Starl - Dubhe". https://onlinelibrary.utah.gov/research/utah_symbols/star.html. 

Coordinates: Sky map 11h 03m 43.67152s, +61° 45′ 03.7249″




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