Omicron_Ophiuchi

Omicron Ophiuchi

Omicron Ophiuchi

Double star in the constellation Ophiuchus

ο Ophiuchi, Latinized as Omicron Ophiuchi, is a wide double star in the equatorial constellation of Ophiuchus. The co-moving pair are visible to the naked eye as a dim point of light, with the two components having apparent visual magnitudes of 5.14 and 6.59.[2] As of 2015, they had an angular separation of 10.0″ along a position angle of 354°.[9] The distance to both stars is approximately 281 light years based on parallax, and they are drifting closer to the Sun with a radial velocity of around −29 km/s.[5]

Quick Facts Observation data Epoch J2000 Equinox J2000, Apparent magnitude (V) ...

The brighter member of the pair, designated component A, is an aging giant star with a stellar classification of G8III.[2] With the supply of hydrogen at its core exhausted, it has expanded to 12[1] times the radius of the Sun. The star is radiating 75[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,849 K.[1] The secondary star, component B, has a class of F6IV-V,[2] matching an F-type star with a luminosity class that is a blend of traits from a main sequence and a subgiant star. It has three[3] times the Sun's radius and is radiating 12.6 times the Sun's luminosity at 6,296 K.[3]

References

  1. [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. [2]
    Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. [3]
    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.
  4. [4]
    Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  5. [5]
    Gontcharov, G. A. (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. S2CID 119231169.
  6. [6]
    Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137.
  7. [7]
    "omi Oph A". SIMBAD. Centre de données astronomiques de Strasbourg.
  8. [8]
    "omi Oph B". SIMBAD. Centre de données astronomiques de Strasbourg.
  9. [9]
    Mason, Brian D.; et al. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
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