Omega Boötis

Omega Boötis (ω Boötis) is the Bayer designation for a solitary,[9] orange-hued star in the northern constellation of Boötes. It is a dim star but visible to the naked eye with an apparent visual magnitude of +4.82.[2] Based upon an annual parallax shift of 8.78 mas as seen from the Earth, it is located about 370 light years from the Sun.

Omega Boötis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Boötes
Right ascension  15h 02m 06.50855s[1]
Declination +25° 00′ 29.3003″[1]
Apparent magnitude (V) +4.82[2]
Characteristics
Spectral type K4 III[3]
U−B color index +1.83[2]
B−V color index +1.50[2]
Astrometry
Radial velocity (Rv)+12.47±0.19[4] km/s
Proper motion (μ) RA: −5.65[1] mas/yr
Dec.: −48.34[1] mas/yr
Parallax (π)8.78 ± 0.28[1] mas
Distance370 ± 10 ly
(114 ± 4 pc)
Absolute magnitude (MV)−0.41[4]
Details
Mass1.65[5] M☉
Radius37[6] R☉
Luminosity324[5] L☉
Surface gravity (log g)1.88±0.24[7] cgs
Temperature3,962±35[5] K
Metallicity [Fe/H]0.06±0.08[7] dex
Age2.99[5] Gyr
Other designations
ω Boo, 41 Boötis, BD+25° 2861, FK5 3185, HD 133124, HIP 73568, HR 5600, SAO 83624[8]
Database references
SIMBADdata

This star is three[5] billion years old with a stellar classification of K4 III,[3] matching an evolved K-type giant star that has consume the supply of hydrogen at its core. The measured angular diameter is 3.04±0.19 mas.[10] At the estimated distance of Omega Boötis, this yields a physical size of about 37 times the radius of the Sun.[6] It has an estimated 1.65[5] times the mass of the Sun and is radiating 324[5] times the Sun's luminosity from its photosphere at an effective temperature of about 3,962 K.[5]

References
  1. van Leeuwen, F. (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.
  2. Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants", Monthly Notices of the Royal Astronomical Society, 172 (3): 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667.
  3. Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics, 11: 29, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333.
  4. Luck, R. Earle; Heiter, Ulrike (June 2007), "Giants in the Local Region", The Astronomical Journal, 133 (6): 2464–2486, Bibcode:2007AJ....133.2464L, doi:10.1086/513194
  5. Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88.
  6. Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
  7. Prugniel, Ph.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, A165.
  8. "ome Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-09.
  9. 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  10. Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
  • Hoffleit; et al. (1991), "HR 5600", Bright Star Catalogue (5th Revised ed.), retrieved 2017-09-11.
  • "ome Boo", Aladin previewer, Centre de Données astronomiques de Strasbourg, retrieved 2017-09-11.
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