Alpha Ursae Majoris
From EverybodyWiki Bios & Wiki
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 |
| Distance | 123 ± 2 ly (37.7 ± 0.7 pc) |
| Absolute magnitude (MV) | −1.10±0.04[7] |
| Details[8] | |
| α UMa A | |
| Mass | 3.44±0.11 M☉ |
| Radius | 17.03±0.13 R☉ |
| Luminosity | 165.1±8.3 L☉ |
| Surface gravity (log g) | 2.20 cgs |
| Temperature | 5,012±65 K |
| Metallicity [Fe/H] | −0.20±0.07[9] dex |
| Rotational velocity (v sin i) | 2.6±1.0[7] km/s |
| Age | 280±30 Myr |
| α UMa B | |
| Mass | ~1.6[3] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
Dubhe or Alpha Ursae Majoris is an orange giant star in the constellation of Ursa Major. It is 27 times wider than the Sun.
References[edit]
- ↑ 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. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Unknown parameter
|s2cid=ignored (help) - ↑ 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
- ↑ 3.0 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. Bibcode:2000ApJ...530L..45G. doi:10.1086/312473. PMID 10642202.
- ↑ Tokovinin, A. A. (1997). "MSC - a catalogue of physical multiple stars". Astronomy and Astrophysics Supplement Series. 124: 75–84. Bibcode:1997A&AS..124...75T. doi:10.1051/aas:1997181.
- ↑ 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.
- ↑ 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. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. Unknown parameter
|s2cid=ignored (help) - ↑ 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, arXiv:0711.4984, Bibcode:2008AJ....135..892C, doi:10.1088/0004-6256/135/3/892 Unknown parameter
|s2cid=ignored (help) - ↑ Baines, E.; et al. (2017). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 155 (1): 30. arXiv:1712.08109. Bibcode:2018AJ....155...30B. doi:10.3847/1538-3881/aa9d8b. Unknown parameter
|s2cid=ignored (help) - ↑ 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, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527
- ↑ "DUBHE -- Spectroscopic binary", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-12-23
 | This science article is a stub. You can help EverybodyWiki by expanding it. |
This article "Alpha Ursae Majoris" is from Wikipedia. The list of its authors can be seen in its historical. Articles copied from Draft Namespace on Wikipedia could be seen on the Draft Namespace of Wikipedia and not main one.
