Omega Boötis

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

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.

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. 1 2 3 4 5 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. 1 2 3 4 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. 1 2 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. 1 2 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. 1 2 3 4 5 6 7 8 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. 1 2 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. 1 2 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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