15_Boötis

15 Boötis

15 Boötis

Binary star in the northern constellation of Boötes

15 Boötis is a binary star[2] system in the northern constellation of Boötes,[8] located approximately 260 light years away from the Sun.[1] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.45.[2] The system has a relatively high proper motion, traversing the celestial sphere at the rate of 0.166 arc seconds per annum.[9] It is moving away from the Earth with a heliocentric radial velocity of +16.8 km/s.[4]

Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...

The magnitude 5.51[2] primary, designated component A, is an aging K-type giant star with a stellar classification of K1 III.[3] It is a red clump giant,[7] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. It is around two[5] billion years old with 1.5[5] times the mass of the Sun and has expanded to 10[6] times the Sun's radius. The star is radiating 61[4] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,845 K.[5]

Its companion, component B, is a magnitude +8.53 star[2] was located at an angular separation of 0.80″ along a position angle of 111° from the primary, as of 2015. This is the same separation it had when the system was discovered in 1936.[10]

References

  1. [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, S2CID 18759600.
  2. [2]
    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.
  3. [3]
    Harlan, E. A.; Taylor, D. C. (March 1970), "MK classification for F- and G-type stars. II", Astronomical Journal, 75 (2): 165–166, Bibcode:1970AJ.....75..165H, doi:10.1086/110956.
  4. [4]
    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.
  5. [5]
    Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817 (1): 40, arXiv:1511.04088, Bibcode:2016ApJ...817...40F, doi:10.3847/0004-637x/817/1/40, S2CID 118675933.
  6. [6]
    Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397
  7. [7]
    Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv:astro-ph/0003329, Bibcode:2000ApJ...539..732A, doi:10.1086/309278, S2CID 16673121.
  8. [8]
    "15 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 7, 2019.
  9. [9]
    Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
  10. [10]
    Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22.
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