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15 Boötis

From Wikipedia, the free encyclopedia

15 Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 14m 50.85024s[1]
Declination +10° 06′ 02.1964″[1]
Apparent magnitude (V) 5.45 (5.51 + 8.53)[2]
Characteristics
Spectral type K1 III[3]
B−V color index 1.007±0.003[4]
Astrometry
Radial velocity (Rv)+16.80±0.40[4] km/s
Proper motion (μ) RA: −20.83[1] mas/yr
Dec.: −164.41[1] mas/yr
Parallax (π)12.31 ± 0.59 mas[1]
Distance260 ± 10 ly
(81 ± 4 pc)
Absolute magnitude (MV)0.75[4]
Details
Mass1.48±0.42[5] M☉
Radius10[6] R☉
Luminosity61.08[4] L☉
Surface gravity (log g)2.55±0.11[5] cgs
Temperature4,845±92[5] K
Metallicity [Fe/H]−0.26[7] dex
Rotational velocity (v sin i)0.0[6] km/s
Age2.0+0.8
−0.6[5] Myr
Other designations
15 Boo, BD+10°2654, FK5 3131, GC 19226, HD 124679, HIP 69612, HR 5330, SAO 100934, CCDM 14148+1006, WDS J14148+1006[8]
Database references
SIMBADdata

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]

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. ^ a b c d e f 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. ^ a b c d e 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. ^ a b 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. ^ a b c d e f 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. ^ a b c d e f g 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. ^ a b c 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. ^ a b 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. ^ a b "15 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 7, 2019.
  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. ^ 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.
This page was last edited on 26 November 2023, at 02:51
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