Omega Boötis

Omega Boötis, its name Latinized from ω Boötis, is a solitary,[8] 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 8.75 mas as seen from the Earth, it is located about 373 light years from the Sun. The star is drifting further away with a radial velocity of +13 km/s.[1]

Omega Boötis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Boötes
Right ascension 15h 02m 06.50862s[1]
Declination +25° 00′ 29.2782″[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)+12.76±0.15[1] km/s
Proper motion (μ) RA: −5.206[1] mas/yr
Dec.: −47.799[1] mas/yr
Parallax (π)8.7483 ± 0.2241 mas[1]
Distance373 ± 10 ly
(114 ± 3 pc)
Absolute magnitude (MV)−0.41[4]
Details
Mass1.65[5] M☉
Radius39.24+1.19
−4.17[1] R☉
Luminosity355±10[1] L☉
Surface gravity (log g)1.88±0.24[6] cgs
Temperature3,962±35[5] K
Metallicity [Fe/H]0.06±0.08[6] dex
Age2.99[5] Gyr
Other designations
ω Boo, 41 Boötis, BD+25° 2861, FK5 3185, HD 133124, HIP 73568, HR 5600, SAO 83624[7]
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. It has an estimated 1.65[5] times the mass of the Sun and has expanded to 39[1] times the Sun's radius. The star is radiating 355[1] times the Sun's luminosity from its photosphere at an effective temperature of about 3,962 K.[5]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  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, S2CID 118505114.
  6. Prugniel, Ph.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439, A165.
  7. "ome Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-09.
  8. 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, S2CID 14878976.
  • 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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